iTeh StandardsiTeh Standards
EURUSD
Your shopping cart is empty.
ASTM

ASTM B893-98(2003)

(Specification)

Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications

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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Feb-2003
ICS
25.220.20 - Surface treatment
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.07 - Conversion Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM B893-98 - Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
Effective Date
10-Feb-2003
Replaced By
ASTM B893-98(2008) - Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
Effective Date
01-Apr-2008
Referred By
ASTM B1023-22 - Standard Test Method for Abrasion Resistance of Hard Anodic Coatings by a Taber-Type Abraser
Effective Date
10-Feb-2003
Referred By
ASTM G195-22 - Standard Guide for Conducting Wear Tests Using a Rotary Platform Abraser
Effective Date
10-Feb-2003

Buy Standard

ASTM B893-98(2003) - Specification for Hard-Coat Anodizing of Magnesium for Engineering ApplicationsASTM B893-98(2003) - Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
PreviousNext
Technical specification
ASTM B893-98(2003) - Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 893 – 98 (Reapproved 2003)
Specification for
Hard-Coat Anodizing of Magnesium for Engineering
Applications
This standard is issued under the fixed designation B 893; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 4060 Test Method for Abrasion Resistance of Organic
Coatings by the Taber Abraser
1.1 This specification covers requirements for electrolyti-
2.2 ISO Standard:
cally formed oxide coatings on magnesium and magnesium
ISO 2080 Electroplating and Related Processes - Vocabu-
alloy parts where appearance, abrasion resistance, and protec-
lary
tion against corrosion are important.
1.2 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions—For definitions of terms relating to this
responsibility of the user of this standard to establish appro-
specification see Terminology B 374.
priate safety and health practices and determine the applica-
3.1.1 anodizing—an electrolytic oxidation process in which
bility of regulatory limitations prior to use.
the surface of a metal, when anodic, is converted to a coating
2. Referenced Documents having desirable protective or functional properties.
3.1.2 hard coat—in anodizing magnesium, an anodic oxide
2.1 ASTM Standards:
coating on magnesium with a higher apparent density and
B 117 Practice for Operating Salt Spray (Fog) Apparatus
thickness, and a greater resistance to wear than the base metal.
B 244 Test Method for Measurement of Thickness of An-
odic Coatings on Aluminum and of Other Nonconductive
4. Classification
Coatings on Nonmagnetic Basis Metals with Eddy-Current
3 4.1 Coating Designation—Thickness.
Instruments
4.1.1 Minimum Thickness of 20 µm.
B 322 Practice for Cleaning Metals Prior to Electroplating
3 4.2 TYPE - Post Treatments.
B 374 Terminology Relating to Electroplating
4.2.1 TYPE A—no post treatment.
B 487 Test Method for Measurement of Metal and Oxide
4.2.2 TYPE B—Purchaser Specified.
Coating Thickness by Microscopical Examination of a
Cross Section
5. Ordering Information (to be supplied by the purchaser
B 537 Practice for Rating of Electroplated Panels Subjected
to the producer.)
to Atmospheric Exposure
5.1 Alloy Designation—When ordering articles anodized in
B 602 Test Method for Attribute Sampling of Metallic and
3 accordancewiththisspecification,thepurchasershallstate,the
Inorganic Coatings
alloy designation number.
B 697 Guide for Selection of Sampling Plans for Inspection
3 5.2 Appearance—Unless otherwise specified by the pur-
of Electrodeposited Metallic and Inorganic Coatings
chaser, an off-white color shall be acceptable for TYPE A
B 762 Test Method of Variables Sampling of Metallic and
3 coating. The purchaser shall specify the color and surface
Inorganic Coatings
4 appearancerequiredforTYPEBcoatings.Allcoatingsshallbe
D 3951 Practice for Commercial Packaging
uniform in color and free from stains. Alternatively, samples
showing the required finish, or range of finishes, shall be
This specification is under the jurisdiction of ASTM Committee B08 on supplied or approved by the purchaser. When required, the
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
basis material may be subjected to such mechanical polishing
B08.07 on Chromate Conversion Coatings.
as may be required to yield the desired final surface character-
Current edition approved Feb. 10, 2003. Published May 2003. Originally
istics.
approved in 1998. Last previous edition approved in 1998 as B 893 – 98.
Annual Book of ASTM Standards, Vol. 03.02.
Annual Book of ASTM Standards, Vol. 02.05.
4 5
Annual Book of ASTM Standards, Vol. 15.09. Annual Book of ASTM Standards, Vol. 06.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 893 – 98 (2003)
performance of the article.
5.3 Significant Surface—The areas of the article covered by
the coating, for which the coating is essential for service or
7.1.2 Thickness
appearance or both.
7.1.2.1 CoatingThicknessforSC20—Theanodicfilmthick-
5.3.1 Contact Marks—Contact marks will occur. The Pur-
nessshallbeaminimumof20umandnotexceed30umonthe
chaser shall specify where contact marks are unacceptable.
significant surface.
5.4 Tolerances—Dimensional build-up is approximately
7.1.2.2 Test—Hard-coating thickness shall be evaluated by
one-half of anodic film thickness. The order document shall
one or more of the following test methods in Section 8.
include any coating thickness tolerances and shall not exceed
7.2 Qualification Tests—The process shall be evaluated
any applicable drawing dimensions.
monthly or more frequently if required by the purchaser using
5.5 Thepurchasershallprovidethenumberforthisstandard
the following test methods on panels that are of the same alloy
TYPE.
of the parts coated with TYPE A hard coat.
5.6 The purchaser shall state any special post treatments.
7.2.1 Corrosion Test—Use method described in 8.1
(see 4.2 and 5.2)
7.2.2 Abrasion Resistance Test—Use the TaberAbraser test
5.7 Test Methods—The purchaser shall state the test meth-
method in Annex A1 of this specification.
od(s) by which the coated article will be evaluated (see Section
8).
8. Test Methods
5.8 Sampling Plan—see Section 9.
5.9 Any requirement for certification (see Section 11). 8.1 Corrosion Test—Panel(s) shall be subjected to a 5
5.10 Any requirement for packaging (see Section 12). percent salt spray (fog) test in accordance with Practice B 117
for 336 h. The panel(s) shall be prepared and evaluated in
6. Materials and Process
accordance with Practice B 537. A Protective Rating of 6 or
less is considered a failure.
6.1 Process
8.2 Abrasion Resistance Test—Test panels in accordance
6.1.1 Basis Metal—This standard does not specify require-
with Annex A1. The acceptance criteria shall be as follows.
ments for the surface condition of the basis metal before
8.2.1 Abrasive Wheel No. CS-10—A wear index of more
anodizing, but agreement should preferably be reached be-
than 7 mg/1000 cycles or less than 10 000 wear cycles shall be
tweenthepurchaserandtheproducerthatthesurfacecondition
considered a failure.
of the basis metal is satisfactory.
8.2.2 Abrasive Wheel No. CS-17—A wear index of more
6.1.2 Surface Preparation—Preparatory procedures and
cleaning of the basis material may be necessary, see Practice than 20 mg/1000 cycles or less than 5 000 wear cycles shall be
considered a failure.
B 322.
6.1.3 Hard-Coating—Following the preparatory operations, 8.3 Thickness Tests:
the articles are introduced into the solution for a period of time 8.3.1 Eddy-Current Method (Test Method B 244)
at the current density and temperature required to produce the
8.3.2 Microscopical Cross Section Method (Test Method
hard-coated surface.
B 487).
NOTE 1—Hard-Coatingsolutionsandoperatingconditionsarecommer-
9. Sampling
cially available. The appropriate operating instructions should be fol-
lowed.
9.1 The purchaser and producer are urged to employ statis-
NOTE 2—Intricately shaped articles may not receive the same thickness
tical process control in the coating process. Properly per-
of coating in recessed areas due to lower current densities. Auxiliary
formed, statistical process control will assure coated products
cathodes, may be used to improve anodize thickness in these areas.
of satisfactory quality and will reduce the amount of accep-
6.2 Post Treatments:
tance inspection. The sampling plan used for the in
...

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 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 C756-87(2021)(Test Method)
Standard Test Method for Cleanability of Surface Finishes

SIGNIFICANCE AND USE
4.1 This test method was developed to guide the user in selecting a finish coating or material that is resistant to soiling in a particular application.  
4.2 The numerical values derived by this test method enables the user to rank finish coatings and materials in regard to soil retention or ease of soil removal.
SCOPE
1.1 This test method covers the numerical evaluation of the ease or difficulty of cleaning soiled surface finishes. This test method is applicable to all surface finishes not affected by water.  
1.2 Values given in SI units are to be regarded as the standard. Inch-pound units are provided for information only.  
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
    8 pages
    English language
    sale 15% off
ASTM
ASTM B507-14(2021)(Practice)
Standard Practice for Design of Articles to Be Electroplated on Racks

SIGNIFICANCE AND USE
2.1 When an article is to be electroplated, it is necessary to consider not only the characteristics of the electroplating process, but also the design of the part to minimize electroplating and finishing costs and solution dragout as well as to improve appearance and functionality. It is often possible during the design and engineering stages to make small adjustments in shape that will result in considerable benefit toward a better quality part at a lower cost.  
2.2 The specific property of an electroplating process that would require some attention to the details of optional designs, is the throwing power of the electroplating solution. This term describes the properties of the solution as it relates to the solution electrical resistance and solution capacitance at the cathode and overall efficiency of the electrolyte system. Throwing power is defined as the improvement of the coating distribution over the primary current distribution on an electrode (usually cathode) in a given solution, under specified conditions.
SCOPE
1.1 This practice covers design information for parts to be electroplated on racks. The recommendations contained herein are not mandatory, but are intended to give guidance toward good practice.  
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
    5 pages
    English language
    sale 15% off
ASTM
ASTM B242-99(2020)(Guide)
Standard Guide for Preparation of High-Carbon Steel for Electroplating

ABSTRACT
This guide outlines the standard procedure for establishing and maintaining a preparatory cycle for electroplating on high carbon steel producing minimal hydrogen embrittlement and maximal adhesion of the electrodeposited metal. The reagents needed for this method are technical grade hydrochloric acid, nitric acid, sulfuric acid, and water. Steel substrates shall conform to required hardness, hydrogen embrittlement, and surface oxidation characteristics, and quality. Proper preplating treatments such as precleaning, stress relief treatment, mechanical treatment, electrolytic anodic cleaning, hydrochloric acid treatment, treatment for smut removal, anodic acid etching, and electropolishing shall be performed. Coating adhesion and embrittlement shall be tested.
SCOPE
1.1 This guide is intended as an aid in establishing and maintaining a preparatory cycle for electroplating on high-carbon steel (Note 1) producing a minimum of hydrogen embrittlement and maximum adhesion of the electrodeposited metal. For the purpose of this guide, steels containing 0.35 % of carbon or more, and case-hardened low-carbon steel, are defined as high-carbon steels. There is no generally recognized definite carbon content dividing high from low-carbon steels for electroplating purposes.  
Note 1: Electroplating of plain high-carbon steel introduced problems not found in similar operations on low-carbon steel. During the cleaning and electroplating cycle, high-carbon steel differs from low-carbon steel in regard to its greater tendency to become embrittled and the greater difficulty in obtaining maximum adhesion of the electrodeposit. The preparation of low-carbon steel for electroplating is covered in Practice B183.  
1.2 This guide does not apply to the electroplating of alloy steel. For methods of chromium electroplating directly on steel, see Guide B177.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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. For a specific hazards statement, see 3.1.  
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.

  • Guide
    5 pages
    English language
    sale 15% off
ASTM
ASTM B580-79(2019)(Specification)
Standard Specification for Anodic Oxide Coatings on Aluminum

ABSTRACT
This specification covers the requirements for porous oxide coatings deposited by electrolysis on aluminum and aluminum alloy parts. These coatings should have good appearance, abrasion resistance, electrical properties, and protection against corrosion and does not include nonporous barrier layer anodic coatings that are used for electrical capacitors. The basis metals for these coatings should be subjected to mechanical finishing operations, cleaning, and chemical or electrolytic pre-treatments to yield coatings with fine quality and appearance. Anodized parts should be sealed in water or aqueous chemical solutions except when otherwise specified. Each anodic coating should be continuous, smooth, adherent, uniform in appearance, and free of powdery areas (burns, loose films, stains, discolorations, and discontinuities.
SCOPE
1.1 This specification covers requirements for electrolytically formed porous oxide coatings on aluminum and aluminum alloy parts in which appearance, abrasion resistance, electrical properties, and protection against corrosion are important. Nonporous, barrier layer anodic coatings used for electrical capacitors are not covered. Seven types of coatings as shown in Table 1 are provided. Definitions and typical examples of service conditions are provided in Appendix X1.  
Note 1: It is recognized that uses exist in which modifications of the coatings covered by this specification may be required. In such cases the particular properties desired by the purchaser should be the subject of agreement between the purchaser and the manufacturer.  
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 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
    3 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 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 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