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ASTM B137-95(2000)

(Test Method)

Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum

Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum

SCOPE
1.1 This test method covers determination of the mass per unit area of coating on anodically coated aluminum and its alloys.  
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-Mar-2000
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.07 - Conversion Coatings
Current Stage
Ref Project

Relations

Replaced By
ASTM B137-95(2004) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
Effective Date
01-Oct-2004
Referred By
ASTM B680-80(2019) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
Effective Date
10-Mar-2000
Referred By
ASTM B580-79(2019) - Standard Specification for Anodic Oxide Coatings on Aluminum
Effective Date
10-Mar-2000
Referred By
ASTM B767-88(2021) - Standard Guide for Determining Mass Per Unit Area of Electrodeposited and Related Coatings by Gravimetric and Other Chemical Analysis Procedures
Effective Date
10-Mar-2000

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ASTM B137-95(2000) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated AluminumASTM B137-95(2000) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
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ASTM B137-95(2000) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Endorsed by American
Designation: B 137 – 95 (Reapproved 2000) Electroplaters’ Society
Endorsed by National
Association of Metal Finishers
Standard Test Method for
Measurement of Coating Mass Per Unit Area on Anodically
Coated Aluminum
This standard is issued under the fixed designation B 137; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 5. Test Specimen
1.1 This test method covers determination of the mass per 5.1 Prepare a test specimen of known surface area, prefer-
unit area of coating on anodically coated aluminum and its ably a piece about 75 mm square. If the anodic coating is
alloys. contaminated or impregnated with oil, grease, lacquer, etc.,
1.2 This standard does not purport to address all of the remove as much as possible of this material before determining
safety concerns, if any, associated with its use. It is the the mass of the coating. It is not usually practicable to remove
responsibility of the user of this standard to establish appro- these materials from the pores of the coating, but surface films
priate safety and health practices and determine the applica- can frequently be removed by wiping the sample with a cloth
bility of regulatory limitations prior to use. wet with a suitable solvent.
5.2 In cases where it is required to measure the mass of
2. Referenced Documents
coating on only one side of a specimen where both sides have
2.1 ASTM Standards: anodic coatings, the following procedure may be used:
D 1193 Specification for Reagent Water
5.2.1 Prepare a specimen somewhat larger than required for
5.1.
3. Significance and Use
5.2.2 Apply a suitable stop off around the edges of the
3.1 This test method is a destructive test procedure suitable
specimen so that the area on the side of the specimen that is not
for quality control within manufacturing operations for coating
to be tested is about 75 mm square. Paraffin wax has been used
mass on anodically coated aluminum and aluminum alloys.
for this purpose, but any stop off that resists warm sodium
The mass of the coating is an approximation of its thickness
hydroxide is suitable.
provided the conditions under which the coating was applied,
5.2.3 Swab the area with a warm solution of sodium
or the density of the coating, are known. An anodic coating’s
hydroxide (10 mass %, 100 g/L) until bare metal is exposed,
protective value and amenability to coloring by dying or
which is indicated by uniform bubbling over the entire exposed
electrolytic methods are related to mass of coating per unit
surface.
area.
5.2.4 Swab with warm distilled water.
5.2.5 Dry with a clean cloth.
4. Reagents
5.2.6 Swab with diluted nitric acid (1 part HNO , density
4.1 The test solution shall have the following makeup:
1.41, plus 1 part water).
Chromic acid anhydride (CrO)20 6 0.5 g
5.2.7 Rinse with warm deionized or distilled water.
Orthophosphoric acid of 85 mass %, density
5.2.8 Dry at approximately 100°C until dry.
1.69 35 6 0.5 mL
5.2.9 Cool and shear off the area covered with stop off, so
Distilled or deionized water conforming with
Type III Reagent Water of Specification
that the coated area
...

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4.1 Porosity tests indicate the completeness of protection or coverage offered by the coating. When a given coating is known to be protective when properly deposited, the porosity serves as a measure of the control of the process. The effects of substrate finish and preparation, plating bath, coating process, and handling, may all affect the degree of imperfection that is measured.
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1.1 This guide describes some of the available standard methods for the detection, identification, and measurement of porosity and gross defects in electrodeposited and related metallic coatings and provides some laboratory-type evaluations and acceptances. Some applications of the test methods are tabulated in Table 1 and Table 2.    
1.2 This guide does not apply to coatings that are produced by thermal spraying, ion bombardment, sputtering, and other similar techniques where the coatings are applied in the form of discrete particles impacting on the substrate.  
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1.4 Porosity test results (including those for gross defects) occur as chemical reaction end products. Some occur in situ, others on paper, or in a gel coating. Observations are made that are consistent with the test method, the items being tested, and the requirements of the purchaser. These may be visual inspection (unaided eye) or by 10× magnification (microscope). Other methods may involve enlarged photographs or photomicrographs.  
1.5 The test methods are only summarized. The individual standards must be referred to for the instructions on how to perform the tests.  
1.6 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
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Standard Practice for Qualitative Adhesion Testing of Metallic Coatings

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2.1 These tests are useful for production control and for acceptance testing of products.  
2.2 Interpreting the results of qualitative methods for determining the adhesion of metallic coatings is often a controversial subject. If more than one test is used, failure to pass any one test is considered unsatisfactory. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements. For example, an article that is to be subsequently formed would suggest a draw or a bend test; an article that is to be soldered or otherwise exposed to heat would suggest a heat-quench test. If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well.  
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1.1 This practice covers simple, qualitative tests for evaluating the adhesion of metallic coatings on various substances.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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