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ASTM B137-95(2009)

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

General Information

Status
Historical
Publication Date
14-Apr-2009
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.07 - Conversion Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM B137-95(2004) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
Effective Date
15-Apr-2009
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
15-Apr-2009
Referred By
ASTM B680-80(2019) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
Effective Date
15-Apr-2009
Referred By
ASTM B580-79(2019) - Standard Specification for Anodic Oxide Coatings on Aluminum
Effective Date
15-Apr-2009

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ASTM B137-95(2009) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated AluminumASTM B137-95(2009) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B137 − 95 (Reapproved2009) 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
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 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
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 and health practices and determine the applica-
“strippingsolution”foranodiccoatings.Thissolutiondissolvestheanodic
bility of regulatory limitations prior to use.
coating with no significant attack of the substrate metal.
2. Referenced Documents
5. Test Specimen
2.1 ASTM Standards:
5.1 Prepare a test specimen of known surface area, prefer-
D1193 Specification for Reagent Water
ably a piece about 75 mm square. If the anodic coating is
contaminated or impregnated with oil, grease, lacquer, etc.,
3. Significance and Use
remove as much as possible of this material before determining
the mass of the coating. It is not usually practicable to remove
3.1 This test method is a destructive test procedure suitable
these materials from the pores of the coating, but surface films
for quality control within manufacturing operations for coating
can frequently be removed by wiping the sample with a cloth
mass on anodically coated aluminum and aluminum alloys.
wet with a suitable solvent.
The mass of the coating is an approximation of its thickness
provided the conditions under which the coating was applied,
5.2 In cases where it is required to measure the mass of
or the density of the coating, are known. An anodic coating’s
coating on only one side of a specimen where both sides have
protective value and amenability to coloring by dying or
anodic coatings, the following procedure may be used:
electrolytic methods are related to mass of coating per unit
5.2.1 Prepare a specimen somewhat larger than required for
area.
5.1.
5.2.2 Apply a suitable stop off around the edges of the
specimen so that the area on the side of the specimen that is not
This test method is under the jurisdiction ofASTM Committee B08 on Metallic to be tested is about 75 mm square. Paraffin wax has been used
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.07 on
for this purpose, but any stop off that resists warm sodium
Conversion Coatings.
hydroxide is suitable.
Current edition approved April 15, 2009. Published July 2009. Originally
5.2.3 Swab the area with a warm solution of sodium
approved in 1940. Last previous edition approved in 2000 as B137 – 95 (2000).
DOI: 10.1520/B0137-95R09.
hydroxide (10 mass %, 100 g/L) until bare metal is exposed,
For referenced ASTM standar
...


This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Endorsed by American
Designation:B137–95(Reapproved 2004) Designation:B137–95(ReapprovedElectroplaters’2009) 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 (´) 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
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.
2. Referenced Documents
2.1 ASTM Standards:
D 1193 Specification for Reagent Water
3. Significance and Use
3.1 Thistestmethodisadestructivetestproceduresuitableforqualitycontrolwithinmanufacturingoperationsforcoatingmass
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.
4. Reagents
4.1 The test solution shall have the following makeup:
Chromic acid anhydride (CrO)20 6 0.5 g
Orthophosphoric acid of 85 mass %, density
1.69 35 6 0.5 mL
Distilled or deionized water conforming with
Type III Reagent Water of Specification
D 1193, to make up to 1000 mL
NOTE 1—This solution is commonly referred to as a nondestructive “stripping solution” for anodic coatings. This solution dissolves the anodic coating
with no significant attack of the substrate metal.
5. Test Specimen
5.1 Prepareatestspecimenofknownsurfacearea,preferablyapieceabout75mmsquare.Iftheanodiccoatingiscontaminated
or impregnated with oil, grease, lacquer, etc., remove as much as possible of this material before determining the mass of the
coating. It is not usually practicable to remove these materials from the pores of the coating, but surface films can frequently be
removed by wiping the sample with a cloth wet with a suitable solvent.
5.2 In cases where it is required to measure the mass of coating on only one side of a specimen where both sides have anodic
coatings, the following procedure may be used:
5.2.1 Prepare a specimen somewhat larger than required for 5.1.
5.2.2 Apply a suitable stop off around the edges of the specimen so that the area on the side of the specimen that is not to be
This test method is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.07 on
Chromate Conversion Coatings.
Current edition approved Oct. 1, 2004.April 15, 2009. Published October 2004.July 2009. Originally approved in 1940. Last previous edition approved in 2000 as
B 137 – 95 (2000).
For referencedASTM standards, vis
...

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