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ASTM B137-95(2014)

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

General Information

Status
Historical
Publication Date
31-Oct-2014
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(2014) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated AluminumASTM B137-95(2014) - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation: B137 − 95 (Reapproved 2014) 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 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
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
5.1 Prepare a test specimen of known surface area, prefer-
2.1 ASTM Standards:
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 Nov. 1, 2014. Published November 2014. Originally
5.2.3 Swab the area with a warm solution of sodium
approved in 1940. Last previous edition approved in 2009 as B137 – 95 (2009).
DOI: 10.1520/B0137-95R14.
hydroxide (10 mass %, 100 g/L) until bare metal is exposed,
For referenced A
...


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.
Designation: B137 − 95 (Reapproved 2009) B137 − 95 (Reapproved 2014) 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 U.S. 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:
D1193 Specification for Reagent Water
3. 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.
4. Reagents
4.1 The test solution shall have the following makeup:
Chromic acid anhydride (CrO ) 20 ± 0.5 g
Orthophosphoric acid of 85 mass %, density
1.69 35 ± 0.5 mL
Distilled or deionized water conforming with
Type III Reagent Water of Specification
D1193, to make up to 1000 mL
Chromic acid anhydride (CrO ) 20 ± 0.5 g
Orthophosphoric acid of 85 mass %, density
1.69 35 ± 0.5 mL
Distilled or deionized water conforming with
Type III Reagent Water of Specification
D1193, 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 Prepare a test specimen of known surface area, preferably a piece about 75 mm square. If the anodic coating is contaminated
or impregnated with oil, grease, lacquer, etc., remove as much as possible of this material before determining the mass of the
This test method is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.07 on
Conversion Coatings.
Current edition approved April 15, 2009Nov. 1, 2014. Published July 2009 November 2014. Originally approved in 1940. Last previous edition approved in 20002009
as B137 – 95 (2000).(2009). DOI: 10.1520/B0137-95R09.10.1520/B0137-95R14.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B137 − 95 (2014)
coating. It is not usually practicable to remove these materials from the pores of the coating, but surface films can f
...

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