iTeh StandardsiTeh Standards
EURUSD
Your shopping cart is empty.
ASTM

ASTM G100-89(2004)

(Test Method)

Standard Test Method for Conducting Cyclic Galvanostaircase Polarization

Standard Test Method for Conducting Cyclic Galvanostaircase Polarization

SCOPE
1.1 This test method covers a procedure for conducting cyclic galvanostaircase polarization (GSCP) to determine relative susceptibility to localized corrosion (pitting and crevice corrosion) for aluminum alloy 3003-H14 (UNS A93003) (1). It may serve as guide for examination of other alloys (2-5). This test method also describes a procedure that can be used as a check for one's experimental technique and instrumentation.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Oct-2004
ICS
25.220.20 - Surface treatment
Technical Committee
G01 - Corrosion of Metals
Drafting Committee
G01.11 - Electrochemical Measurements in Corrosion Testing
Current Stage
Ref Project

Relations

Replaces
ASTM G100-89(1999) - Standard Test Method for Conducting Cyclic Galvanostaircase Polarization
Effective Date
01-Nov-2004
Replaced By
ASTM G100-89(2010)e1 - Standard Test Method for Conducting Cyclic Galvanostaircase Polarization
Effective Date
01-May-2010

Buy Standard

ASTM G100-89(2004) - Standard Test Method for Conducting Cyclic Galvanostaircase PolarizationASTM G100-89(2004) - Standard Test Method for Conducting Cyclic Galvanostaircase Polarization
PreviousNext
Standard
ASTM G100-89(2004) - Standard Test Method for Conducting Cyclic Galvanostaircase Polarization
English language
4 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation:G100–89(Reapproved 2004)
Standard Test Method for
Conducting Cyclic Galvanostaircase Polarization
This standard is issued under the fixed designation G100; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope are not intended to correlate in a quantitative manner with the
rate of propagation of localized corrosion that one might
1.1 This test method covers a procedure for conducting
observe in service.
cyclic galvanostaircase polarization (GSCP) to determine rela-
3.2 The breakdown (E ), and protection potentials (E )
tive susceptibility to localized corrosion (pitting and crevice b prot
determined by the cyclic GSCP method correlate with the
corrosion) for aluminum alloy 3003-H14 (UNSA93003) (1).
constant potential corrosion test (immersion-glassware) result
It may serve as guide for examination of other alloys (2–5).
for aluminum (1, 6, 8). When the applied potential was more
Thistestmethodalsodescribesaprocedurethatcanbeusedas
negative than the GSCP E , no pit initiation was observed.
a check for one’s experimental technique and instrumentation. prot
When the applied potential was more positive than the GSCP
1.2 This standard does not purport to address all of the
E ,pittingoccurredevenwhentheappliedpotentialwasless
safety concerns, if any, associated with its use. It is the prot
negative than E .
b
responsibility of the user of this standard to establish appro-
3.2.1 Severecrevicecorrosionoccurredwhentheseparation
priate safety and health practices and determine the applica-
of E and E was 500 mV or greater and E was less
b prot prot
bility of regulatory limitations prior to use.
than−400 mV Vs. SCE (in 100 ppm NaCl) (1, 6, 7). For
2. Referenced Documents
aluminum, E determined by cyclic GSCP agrees with the
prot
repassivationpotentialdeterminedbythescratchpotentiostatic
2.1 ASTM Standards:
method (1, 10). Both the scratch potentiostatic method and the
D1193 Specification for Reagent Water
constant potential technique for determination of E require
prot
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
much longer test times and are more involved techniques than
sion Test Specimens
the GSCP method.
G5 Reference Test Method for Making Potentiostatic and
3.3 DeBerry and Viebeck (3–5) found that the breakdown
Potentiodynamic Anodic Polarization Measurements
potentials (E ) (galvanodynamic polarization, similar to GSCP
G59 Test Method for Conducting Potentiodynamic Polar- b
but no kinetic information) had a good correlation with the
ization Resistance Measurements
inhibition of localized corrosion of 304L stainless steel by
G69 Test Method for Measurement of Corrosion Potentials
surface active compounds. They attained accuracy and preci-
of Aluminum Alloys
sion by avoiding the strong induction effect which they
3. Significance and Use
observed by the potentiodynamic technique.
3.4 If this test method is followed using the specific alloy
3.1 In this test method, susceptibility to localized corrosion
discussed it will provide (GSCP) measurements that will
of aluminum is indicated by a protection potential (E )
prot
reproduce data developed at other times in other laboratories.
determined by cyclic galvanostaircase polarization (1). The
3.5 E and E obtainedarebasedontheresultsfromeight
more noble this potential, the less susceptible is the alloy to
b prot
different laboratories that followed the standard procedure
initiationoflocalizedcorrosion.Theresultsofthistestmethod
using aluminum alloy 3003-H14 (UNS A93003). E and E
b prot
are included with statistical analysis to indicate the acceptable
This test method is under the jurisdiction of ASTM Committee G01 on
range.
Corrosion of Metals and is the direct responsibility of Subcommittee G1.11 on
Electrochemical Measurements in Corrosion Testing.
4. Apparatus
Current edition approved Nov 1, 2004. Published November 2004. Originally
approved in 1989. Last previous edition approved in 1999 as G100–1999). DOI:
4.1 Cell—The cell should be constructed of inert materials
10.1520/G0100-89R04.
such as borosilicate glass and PTFE fluorocarbon. It should
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof
have ports for the insertion of a working electrode (1 cm flat
this test method.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or specimen holder (Note 1) is very convenient), two auxiliary
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
electrodes, salt bridge for reference electrode, and a thermom-
Standards volume information, refer to the standard’s Document Summary page on
eterorathermostatprobefortemperaturecontrol.Thefigurein
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
G100–89 (2004)
NOTE 3—Coarse grades of graphite should be avoided because they
Test Method G5 would be satisfactory, but a flat bottom cell is
absorb solute impurities. Ultrafine grades are available from spectro-
also satisfactory provided that all of the essential ports are
graphic supply companies.
provided. (See Ref (9) for details.)
4.3.3 Reference Electrode—Saturated calomel (Note 1). It
NOTE 1—These specific recommendations and conditions were fol-
should be checked against another reference which has not
lowedtoimprovetheinter-laboratoryprecisionduringtheroundrobinfor
been exposed to test solutions and they should be within 3 mV
galvanostaircase polarization.
of each other. Practice G69 round robin test conducted by
4.2 Current Staircase Generator and Recorder—The sche-
G01.11 (unpublished results) indicate that potential difference
matic diagram of the apparatus is given in Fig. 1.The recorder
should not exceed 2 or 3 mV. The reference electrode is
may be replaced by a plotter if the current staircase signal is
connected to the test bridge solution which consists of 75%
generatedwiththeaidofacomputer.Thecurrentstaircasemay
saturated KCl, prepared by adding 1 part (by volume) of
be generated manually (Note 2) but this is not recommended.
distilled water to 3 parts saturated KCl. When the bridge is in
The most convenient current staircase generators are found in
active use, the bridge solution should be replaced once each
recent commercial potentiostats where the software is avail-
day and the bridge tip immersed in this solution when not in
able. The electrical equipment may be checked in accordance
use. Any test solution that does not deposit films may also be
with the procedure in Practice G59.
usedinthebridge.(TheVYCOR tip should notbeallowedto
NOTE 2—The current staircase signal was generated manually in the go to dryness.)
roundrobinbecauseautomatedsystemorsoftwarewasnotavailablewhen
4.4 Magnetic Stirrer.
this project was started.
4.3 Electrodes: 5. Procedure
4.3.1 Working Electrode—For generating data to be com-
5.1 Test solution, 3000 6 30 ppm (0.0513 M) NaCl. For
paredtothereferencedataincludedhere
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

This May Also Interest You

ASTM
ASTM G100-89(2021)(Test Method)
Standard Test Method for Conducting Cyclic Galvanostaircase Polarization

SIGNIFICANCE AND USE
3.1 In this test method, susceptibility to localized corrosion of aluminum is indicated by a protection potential (Eprot) determined by cyclic galvanostaircase polarization (1). The more noble this potential, the less susceptible is the alloy to initiation of localized corrosion. The results of this test method are not intended to correlate in a quantitative manner with the rate of propagation of localized corrosion that one might observe in service.  
3.2 The breakdown (Eb), and protection potentials (Eprot) determined by the cyclic GSCP method correlate with the constant potential corrosion test (immersion-glassware) result for aluminum (1, 6, 7). When the applied potential was more negative than the GSCP Eprot, no pit initiation was observed. When the applied potential was more positive than the GSCP Eprot, pitting occurred even when the applied potential was less negative than Eb.  
3.2.1 Severe crevice corrosion occurred when the separation of Eb and Eprot was 500 mV or greater and Eprot was less than −400 mV Vs. SCE (in 100 ppm NaCl) (1, 6, 8). For aluminum, Eprot determined by cyclic GSCP agrees with the repassivation potential determined by the scratch potentiostatic method (1, 9). Both the scratch potentiostatic method and the constant potential technique for determination of Eprot require much longer test times and are more involved techniques than the GSCP method.  
3.3 DeBerry and Viebeck (3-5) found that the breakdown potentials (Eb) (galvanodynamic polarization, similar to GSCP but no kinetic information) had a good correlation with the inhibition of localized corrosion of 304L stainless steel by surface active compounds. They attained accuracy and precision by avoiding the strong induction effect which they observed by the potentiodynamic technique.  
3.4 If this test method is followed using the specific alloy discussed it will provide (GSCP) measurements that will reproduce data developed at other times in other laboratories.  
3.5 Eb and Eprot...
SCOPE
1.1 This test method covers a procedure for conducting cyclic galvanostaircase polarization (GSCP) to determine relative susceptibility to localized corrosion (pitting and crevice corrosion) for aluminum alloy 3003-H14 (UNS A93003) (1).2 It may serve as guide for examination of other alloys (2-5). This test method also describes a procedure that can be used as a check for one's experimental technique and instrumentation.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    4 pages
    English language
    sale 15% off
ASTM
ASTM G82-98(2021)e1(Guide)
Standard Guide for Development and Use of a Galvanic Series for Predicting Galvanic Corrosion Performance

SIGNIFICANCE AND USE
4.1 When two dissimilar metals in electrical contact are exposed to a common electrolyte, one of the metals can undergo increased corrosion while the other can show decreased corrosion. This type of accelerated corrosion is referred to as galvanic corrosion. Because galvanic corrosion can occur at a high rate, it is important that a means be available to alert the user of products or equipment that involve the use of dissimilar metal combinations in an electrolyte of the possible effects of galvanic corrosion.  
4.2 One method that is used to predict the effects of galvanic corrosion is to develop a galvanic series by arranging a list of the materials of interest in order of observed corrosion potentials in the environment and conditions of interest. The metal that will suffer increased corrosion in a galvanic couple in that environment can then be predicted from the relative position of the two metals in the series.  
4.3 Types of Galvanic Series:  
4.3.1 One type of Galvanic Series lists the metals of interest in order of their corrosion potentials, starting with the most active (electronegative) and proceeding in order to the most noble (electropositive). The potentials themselves (versus an appropriate reference half-cell) are listed so that the potential difference between metals in the series can be determined. This type of Galvanic Series has been put in graphical form as a series of bars displaying the range of potentials exhibited by the metal listed opposite each bar. Such a series is illustrated in Fig. 1.    
4.4 Use of a Galvanic Series:  
4.4.1 Generally, upon coupling two metals in the Galvanic Series, the more active (electronegative) metal will have a tendency to undergo increased corrosion while the more noble (electropositive) metal will have a tendency to undergo reduced corrosion.  
4.4.2 Usually, the further apart two metals are in the series, and thus the greater the potential difference between them, the greater is the driving force f...
SCOPE
1.1 This guide covers the development of a galvanic series and its subsequent use as a method of predicting the effect that one metal can have upon another metal can when they are in electrical contact while immersed in an electrolyte. Suggestions for avoiding known pitfalls are included.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 5.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Guide
    7 pages
    English language
    sale 15% off
ASTM
ASTM F2217/F2217M-13(2023)(Practice)
Standard Practice for Coating/Adhesive Weight Determination

SIGNIFICANCE AND USE
5.1 Coating weight is an indicator of certain functional characteristics of coated substrates (for example, sealability, peelability, appearance). The methodology described in this practice is a means of determining coat weight.  
5.2 This practice does not address acceptability criteria. These need to be jointly determined by the user and producer of the product.  
5.3 The methodology described in this practice includes operator assessment of effective coating removal. This is a subjective assessment and requires operator training for consistent results.  
5.4 This practice is applicable to coated substrates in which only the coating is soluble in the chosen solvent. The solvent used is critical to the success of the coating removal process. The coated substrate manufacturer must provide guidance in choice of solvent.
SCOPE
1.1 This practice covers a procedure for determining the amount of coating applied to a substrate, (for example, film, paper, nonwoven). The amount of coating is expressed as a weight per given area, (for example, g/m2, lb/ream).  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    3 pages
    English language
    sale 15% off
ASTM
ASTM D5009-02(2023)(Test Method)
Standard Test Method for Evaluating and Comparing Transfer Efficiency of Spray Applied Coatings Under Laboratory Conditions

SIGNIFICANCE AND USE
5.1 Subject to the limitations listed above, the procedure can be used as a research tool to optimize spray equipment and paint formulations as well as to study the relative effect on transfer efficiency of changing operating variables, spray application equipment, and types of coatings.
SCOPE
1.1 This test method covers the evaluation and comparison of the transfer efficiency of spray-applied coatings under controlled laboratory conditions.  
1.2 This test method has been shown to yield excellent intralaboratory reproducibility. Interlaboratory precision is poorer and is highly dependent on closely controlled air flow in the spray booth, the rate at which the paint is delivered to the part, and other variables suggested in the test method.  
1.3 Limitations:  
1.3.1 This laboratory procedure only indicates the direction of the effect of spray variables on transfer efficiency. The magnitude of the effect is determined only by specific plant experience.  
Note 1: This laboratory procedure requires specific equipment and procedures. For those laboratories that do not have access to the type of equipment required a more general laboratory procedure is being prepared as Procedure B.  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 7 and 8.11.9 and 8.13.2.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    4 pages
    English language
    sale 15% off
ASTM
ASTM B893-23(Specification)
Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications

SCOPE
1.1 This specification covers requirements for electrolytically formed oxide coatings on magnesium and magnesium alloy parts where appearance, abrasion resistance, and protection against corrosion are important.  
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
    4 pages
    English language
    sale 15% off
  • Technical specification
    4 pages
    English language
    sale 15% off
ASTM
ASTM B136-23(Test Method)
Standard Test Method for Measurement of Stain Resistance of Anodic Coatings on Aluminum

ABSTRACT
This specification covers measurement of strain resistance of anodic coatings on aluminium and its alloys, that have undergone a sealing treatment and contact with an acidic solution, are stainproof or nonadsorptive with respect to dyes. The method comprises contacting the test area of the anodized specimen with nitric acid solution and, after rinsing and drying, applying a special dye solution followed by rinsing and rubbing the test area with pumice powder, drying, and visual examination of the test area for retention of dye stain. Coatings that exhibit no dye stain or change in color are considered to have passed the test. Reagent grade chemicals shall be used in all tests. A specified solution of nitric acid shall be prepared in distilled or deionized water. A specified volume of aluminium blue 2WL dye shall be dissolved in distilled or deionized water.
SIGNIFICANCE AND USE
3.1 This test method is intended to determine whether anodic oxide coatings on aluminum and its alloys have been properly sealed and as a result are resistant to absorbing dyes.
SCOPE
1.1 This test method is intended to determine whether anodic oxide coatings on aluminum and its alloys, that have undergone a sealing treatment and contact with an acid solution, are stainproof or nonadsorptive with respect to dyes.  
1.2 Coatings that have been properly sealed should be proof against adsorption of coloring materials and, hence, “nonstaining” in many types of service.  
1.3 This test method is applicable to anodic coatings intended for applications where they are exposed to the weather, or for protective purposes in corrosive media, and where resistance to staining is important.
Note 1: Performance in this test is predictive only of susceptibility to stain by dyes. It is not intended to be predictive of other factors in service performance such as pitting or general corrosion.
Note 2: For Aluminum Association Class I and II architectural anodic coatings that are sealed in solutions containing less than 15 ppm silicates or 3 ppm phosphates, the acid pretreatment may be omitted.  
1.4 In the case of coatings colored in deep shades, where estimation of the intensity of any residual dye stain is difficult, interpretation of the test is based on whether or not the original color has been affected by the action of the test.  
1.5 This test method is not applicable to:  
1.5.1 Chromic acid type anodic coatings.  
1.5.2 Anodic coatings on aluminum alloys containing more than 2 mass % Cu or 4.5 mass % Si.  
1.5.3 Anodic coatings that have been sealed only in dichromate solutions.  
1.5.4 Anodic coatings that have undergone a treatment to render them hydrophobic.  
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    3 pages
    English language
    sale 15% off
  • Standard
    3 pages
    English language
    sale 15% off
ASTM
ASTM D6529-22(Test Method)
Standard Test Method for Operating Performance of Continuous Electrodeionization Systems on Feeds from 50 μS/cm to 1000 μS/cm

SIGNIFICANCE AND USE
5.1 The CEDI devices can be used to produce deionized water from feeds of pretreated water. This test method permits the relatively rapid measurement of key performance capabilities of CEDI devices using standard sets of conditions. The data obtained can be analyzed to provide information on whether changes may have occurred in operating characteristics of the device independently of any variability in feed water characteristics or operating conditions. Under specific circumstances, this test method may also provide sufficient information for plant design.
SCOPE
1.1 This test method covers the determination of the operating characteristics of continuous electrodeionization (CEDI) devices using synthetic feed solutions and is not necessarily applicable to natural waters. This test method is a procedure applicable to solutions with a conductivity range from approximately 50 μS/cm to 1000 μS/cm.  
1.2 This test method covers the determination of operating characteristics under standard test conditions of CEDI devices where the electrically active transfer media therein is predominantly unregenerated. This results in more rapid achievement of steady state and shorter test time than when performing a test which requires the active media be predominantly regenerated.  
1.3 This test method is not necessarily indicative of the following:  
1.3.1 Long-term performance on feed waters containing foulants or sparingly soluble solutes, or both,  
1.3.2 Performance on feeds of brackish water, sea water, or other high-salinity feeds,  
1.3.3 Performance on synthetic industrial feed solutions, pharmaceuticals, or process solutions of foods and beverages, or,  
1.3.4 Performance on feed waters less than 50 μS/cm, particularly performance relating to organic solutes, colloidal or particulate matter, or biological or microbial matter.  
1.4 This test method, subject to the limitations previously described, can be applied as either an aid to predict expected deionization performance for a given feed water quality, or as a test method to determine whether performance of a given device has changed over some period of time. It is ultimately, however, the user's responsibility to ensure the validity of this test method for their specific applications.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    6 pages
    English language
    sale 15% off
ASTM
ASTM B943-16(2022)(Specification)
Standard Specification for Zinc and Tin Alloy Wire Used in Thermal Spraying for Electronic Applications

ABSTRACT
This specification covers zinc and tin alloy wire, including zinc-aluminum, zinc-aluminum-copper, zinc-tin, zinc-tin-copper an dtin-zinc, used as thermal spray wire in the electronics industry. The wire shall conform to the required chemical composition for cadmium, zinc, tin, lead, antimony, copper, aluminum, bismuth, arsenic, iron, nickel, and magnesium. The wire shall be clean and free of corrosion, adhering foreign material, scale, seams, nicks, burrs, and other defects which would interfere with the operation of thermal spraying equipment. The wire shall uncoil readily and be free of bends or kinks that would prevent its passage through the thermal spray gun. Sampling methodology should ensure that the sample slected for testing is representative of the matreial. The diameter of the wire shall be determines at the end and the beginning of each continuous wire.
SCOPE
1.1 This specification covers zinc and tin alloy wire, including zinc-aluminum, zinc-aluminum-copper, zinc-tin, zinc-tin-copper and tin-zinc, used as thermal spray wire in the electronics industry.  
1.1.1 Certain alloys specified in this standard are also used as solders for the purpose of joining together two or more metals at temperatures below their melting points, and for other purposes (as noted in Annex A1). Specification B907 covers Zinc, Tin and Cadmium Base Alloys Used as Solders which are used primarily for the purpose of joining together two or more metals at temperatures below their melting points and for other purposes (as noted in the Annex part of Specification B907). Specification B833 covers Zinc and Zinc Alloy Wire for Thermal Spraying (Metallizing) used primarily for the corrosion protection of steel (as noted in the Annex part of Specification B833).  
1.1.2 Tin base alloys are included in this specification because their use in the electronics industry is similar to the use of certain zinc alloys but different than the major use of the tin and lead solder compositions specified in Specification B32.  
1.1.3 These wire alloys have a nominal liquidus temperature not exceeding 850 °F (455 °C).  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
    4 pages
    English language
    sale 15% off
ASTM
ASTM F22-21(Test Method)
Standard Test Method for Hydrophobic Surface Films by the Water-Break Test

SIGNIFICANCE AND USE
5.1 The water-break test as described in this test method is rapid, nondestructive, and may be used for control and evaluation of processes for the removal of hydrophobic contaminants. A water-break “free” test is commonly used for in-process verification of the absence of surface contaminants on metal surfaces that may interfere with subsequent surface treatments such as priming, conversion coating, anodizing, plating, or adhesive bonding  
5.2 This test method is not quantitative and is typically restricted to applications where a go/no go evaluation of cleanliness will suffice.  
5.3 The test may also be used for the detection and control of hydrophobic contaminants in processing environments. For this application, a witness surface free of hydrophobic films is exposed to the environment and subsequently tested. The sensitivity of this test will vary with the level of airborne contaminant and the duration of exposure of the witness surface.  
5.4 For quantitative measurement of surface wetting, test methods that measure contact angle of a sessile drop of water or other test liquid may be used in some applications. Measurement methods based on contact angle are shown in Test Methods C813, D5946, and D7490; and Practice D7334.  
5.4.1 Devices for in situ measurement of contact angle are available. These devices are limited to a small measurement surface area and may not reflect the cleanliness condition of a larger surface. For larger surface areas, localized contact angle measurement, or other quantitative inspection, combined with water-break testing may be useful.  
5.5 For surfaces that cannot be immersed or doused with water, or where such immersion or dousing is impractical, such as previously coated large parts or assemblies, prior to the application of paints, primers or other organic coatings, Test Method F21 may be better suited for the evaluation of surface cleanliness than this test method.
Note 2: This test method is not appropriate where line o...
SCOPE
1.1 This test method covers the detection of the presence of hydrophobic (nonwetting) films on surfaces and the presence of hydrophobic organic materials in processing environments. When properly conducted, the test will enable detection of molecular layers of hydrophobic organic contaminants. On very rough or porous surfaces, the sensitivity of the test may be significantly decreased.  
1.2 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    5 pages
    English language
    sale 15% off
  • Standard
    5 pages
    English language
    sale 15% off
ASTM
ASTM D1735-21(Practice)
Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus

SIGNIFICANCE AND USE
4.1 Water can cause the degradation of coatings, so knowledge of how a coating resists water is helpful in predicting its service life. Failure in water fog tests may be caused by a number of factors, including a deficiency in the coating itself, contamination of the substrate, or inadequate surface preparation. The test is therefore useful for evaluating coatings alone or complete coating systems.  
4.2 Water fog tests are used for research and development of coatings and substrate treatments, specification acceptance, and quality control in manufacturing. These tests usually result in a pass or fail determination, but the degree of failure may also be measured. A coating system is considered to pass if there is no evidence of water-related failure after a specified period of time.  
4.3 Results obtained from the use of water fog tests in accordance with this practice should not be represented as being equivalent to a period of exposure to water in the natural environment, until the degree of quantitative correlation has been established for the coating or coating system.  
4.4 The test apparatus is similar to that used in Practice B117, and the conversion of the apparatus from salt spray to water fog testing is feasible. Care should be taken to remove all traces of the salt from the cabinet and reservoir when converting from salt spray to water fog testing.
SCOPE
1.1 This practice covers the basic principles and operating procedures for testing water resistance of coatings in an apparatus similar to that used for salt spray testing.  
1.2 This practice is limited to the methods of obtaining, measuring, and controlling the conditions and procedures of water fog tests. It does not specify specimen preparation, specific test conditions, or evaluation of results.  
Note 1: Alternative practices for testing the water resistance of coatings include Practices D870, D2247, and D4585.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    3 pages
    English language
    sale 15% off
  • Standard
    3 pages
    English language
    sale 15% off