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ASTM B137-95(2021)

(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

SIGNIFICANCE AND USE
3.1 This test method is a destructive test procedure suitable for quality control within manufacturing operations for coating mass on anodically coated aluminum and aluminum alloys. The mass of the coating is an approximation of its thickness provided the conditions under which the coating was applied, or the density of the coating, are known. An anodic coating's protective value and amenability to coloring by dying or electrolytic methods are related to mass of coating per unit area.
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, 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.

General Information

Status
Published
Publication Date
30-Sep-2021
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.07 - Conversion Coatings
Current Stage
Ref Project

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ASTM B137-95(2021) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated AluminumASTM B137-95(2021) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
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ASTM B137-95(2021) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
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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.
Designation: B137 − 95 (Reapproved 2021) Endorsed by American
Electroplaters’ Society
Endorsed by National
Association of Metal Finishers
Standard Test Method for
Measurement of Coating Mass Per Unit Area on Anodically
1
Coated Aluminum
This standard is issued under the fixed designation B137; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 4. Reagents
1.1 This test method covers determination of the mass per 4.1 The test solution shall have the following makeup:
unit area of coating on anodically coated aluminum and its
Chromic acid anhydride (CrO ) 20±0.5 g
3
Orthophosphoric acid of 85 mass %, density
alloys.
1.69 35 ± 0.5 mL
1.2 This standard does not purport to address all of the
Distilled or deionized water conforming with
Type III Reagent Water of Specification
safety concerns, if any, associated with its use. It is the
D1193, to make up to 1000 mL
responsibility of the user of this standard to establish appro-
NOTE 1—This solution is commonly referred to as a nondestructive
priate safety, health, and environmental practices and deter-
“strippingsolution”foranodiccoatings.Thissolutiondissolvestheanodic
mine the applicability of regulatory limitations prior to use.
coating with no significant attack of the substrate metal.
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Test Specimen
ization established in the Decision on Principles for the
5.1 Prepare a test specimen of known surface area, prefer-
Development of International Standards, Guides and Recom-
ably a piece about 75 mm square. If the anodic coating is
mendations issued by the World Trade Organization Technical
contaminated or impregnated with oil, grease, lacquer, etc.,
Barriers to Trade (TBT) Committee.
remove as much as possible of this material before determining
2. Referenced Documents
the mass of the coating. It is not usually practicable to remove
2
these materials from the pores of the coating, but surface films
2.1 ASTM Standards:
can frequently be removed by wiping the sample with a cloth
D1193 Specification for Reagent Water
wet with a suitable solvent.
3. Significance and Use
5.2 In cases where it is required to measure the mass of
3.1 This test method is a destructive test procedure suitable
coating on only one side of a specimen where both sides have
for quality control within manufacturing operations for coating
anodic coatings, the following procedure may be used:
mass on anodically coated aluminum and aluminum alloys.
5.2.1 Prepare a specimen somewhat larger than required for
The mass of the coating is an approximation of its thickness
5.1.
provided the conditions under which the coating was applied,
5.2.2 Apply a suitable stop off around the edges of the
or the density of the coating, are known. An anodic coating’s
specimen so that the area on the side of the specimen that is not
protective value and amenability to coloring by dying or
to be tested is about 75 mm square. Paraffin wax has been used
electrolytic methods are related to mass of coating per unit
for this purpose, but any stop off that resists warm sodium
area.
hydroxide is suitable.
5.2.3 Swab the area with a warm solution of sodium
1
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
hydroxide (10 mass %, 100 g/L) until bare metal is exposed,
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.07 on
which is indicated by uniform bubbling over the entire exposed
Conversion Coatings.
surface.
Current edition approved Oct. 1, 2021. Published October 2021. Originally
5.2.4 Swab with warm distilled water.
approved in 1940. Last previous edition approved in 2014 as B137 – 95 (2014).
DOI: 10.1520/B0137-95R21.
5.2.5 Dry with a clean cloth.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2.6 Swab with diluted nitric acid (1 part HNO , density
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1.41, plus 1 part water).
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.2.7 Rinse with warm deionized or distilled water.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B137 − 95
...

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This specification establishes the requirements for electrodeposited zinc coatings applied to iron or steel articles for corrosion protection purposes. Electrodeposited zinc-coated steel wires or sheets are not covered here. The coatings shall be provided in four standard thickness classes in the as-plated condition or with one of three types of supplementary finishes. The surfaces of the articles shall under go pre-plating basis metal cleaning, pre- and post-coating treatment for reducing the risk of hydrogen embrittlement, and reactivation and supplementary treatments. Coatings should be sampled, prepared, tested and conform accordingly to specified requirements as to appearance (luster and workmanship), thickness, adhesion, corrosion resistance, and hydrogen embrittlement.
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