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ASTM B137-95(2004)

(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’ 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
30-Sep-2004
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(2000) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
Effective Date
01-Oct-2004
Replaced By
ASTM B137-95(2009) - 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
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
01-Oct-2004
Referred By
ASTM B580-79(2019) - Standard Specification for Anodic Oxide Coatings on Aluminum
Effective Date
01-Oct-2004

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ASTM B137-95(2004) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated AluminumASTM B137-95(2004) - Standard Test Method for Measurement of Coating Mass Per Unit Area on Anodically Coated Aluminum
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ASTM B137-95(2004) - 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:B137–95(Reapproved 2004) 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
Distilled or deionized water conforming with
Type III Reagent Water of Specification
1.1 This test method covers determination of the mass per
D 1193, to make up to 1000 mL
unit area of coating on anodically coated aluminum and its
NOTE 1—This solution is commonly referred to as a nondestructive
alloys.
“strippingsolution”foranodiccoatings.Thissolutiondissolvestheanodic
1.2 This standard does not purport to address all of the
coating with no significant attack of the substrate metal.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5. Test Specimen
priate safety and health practices and determine the applica-
5.1 Prepare a test specimen of known surface area, prefer-
bility of regulatory limitations prior to use.
ably a piece about 75 mm square. If the anodic coating is
contaminated or impregnated with oil, grease, lacquer, etc.,
2. Referenced Documents
remove as much as possible of this material before determining
2.1 ASTM Standards:
the mass of the coating. It is not usually practicable to remove
D 1193 Specification for Reagent Water
these materials from the pores of the coating, but surface films
can frequently be removed by wiping the sample with a cloth
3. Significance and Use
wet with a suitable solvent.
3.1 This test method is a destructive test procedure suitable
5.2 In cases where it is required to measure the mass of
for quality control within manufacturing operations for coating
coating on only one side of a specimen where both sides have
mass on anodically coated aluminum and aluminum alloys.
anodic coatings, the following procedure may be used:
The mass of the coating is an approximation of its thickness
5.2.1 Prepare a specimen somewhat larger than required for
provided the conditions under which the coating was applied,
5.1.
or the density of the coating, are known. An anodic coating’s
5.2.2 Apply a suitable stop off around the edges of the
protective value and amenability to coloring by dying or
specimen so that the area on the side of the specimen that is not
electrolytic methods are related to mass of coating per unit
to be tested is about 75 mm square. Paraffin wax has been used
area.
for this purpose, but any stop off that resists warm sodium
hydroxide is suitable.
4. Reagents
5.2.3 Swab the area with a warm solution of sodium
4.1 The test solution shall have the following makeup:
hydroxide (10 mass %, 100 g/L) until bare metal is exposed,
Chromic acid anhydride (CrO)20 6 0.5 g
which is indicated by uniform bubbling over the entire exposed
Orthophosphoric acid of 85 mass %, density
surface.
1.69 35 6 0.5 mL
5.2.4 Swab with warm distilled water.
5.2.5 Dry with a clean cloth.
This test method is under the jurisdiction ofASTM Committee B08 on Metallic 5.2.6 Swab with diluted nitric acid (1 part HNO , density
...

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This specification establishes the requirements for electrodeposited palladium-nickel (Pd-Ni) coatings for engineering applications. Composite coatings consisting of palladium-nickel and a thin gold over-plate for applications involving electrical contacts are also covered. The classification system for the coatings covered here shall be specified by the basis metal, the thickness of the underplating, the composition type and thickness class of the palladium-nickel coating, and the grade of the gold overplating. Coatings should be sampled, tested, and conform to specified requirements as to purity, appearance, thickness, composition, adhesion, ductility, and integrity (including gross defects, mechanical damage, porosity, and microcracks). Alloy composition shall be examined either by wet method, X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Auger or electron probe X-ray microanalysis (EPMA), or wavelength dispersive spectroscopy (WDS). Coating adhesion shall be analyzed either by bend, heat, or cutting test.
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