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ASTM B680-80(2009)

(Test Method)

Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution

Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution

SIGNIFICANCE AND USE
This test method describes a destructive test procedure for measuring the degree of seal of the porosity in anodic oxide coatings. Low coating mass loss is an indication of good seal quality and of the ability of the coating to resist staining and “blooming” in many types of service.
This test method is suitable for quality control purposes within manufacturing operations and for determining whether anodized parts meet seal quality requirements in applicable specifications.
SCOPE
D
1.1 This test method covers a test for the quality of seal of porous anodic coatings on aluminum and its alloys. It is based upon the loss in mass of the coating after immersion in a warm phosphoric-chromic acid solution.
1.2 This test method is applicable to anodic coatings intended for exposure to the weather, or for protective purposes in corrosive media, and where resistance to staining is important.
1.3 This test method is not applicable to:
1.3.1 Hard coatings, which normally are not sealed.
1.3.2 Anodic coatings that have been sealed only in dichromate solutions.
1.3.3 Anodic coatings that have undergone a treatment to render them hydrophobic.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 B680-80(2004) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
Effective Date
15-Apr-2009
Replaced By
ASTM B680-80(2014) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
Effective Date
01-Nov-2014

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ASTM B680-80(2009) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid DissolutionASTM B680-80(2009) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
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ASTM B680-80(2009) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
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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: B680 − 80 (Reapproved2009)
Standard Test Method for
Seal Quality of Anodic Coatings on Aluminum by Acid
Dissolution
This standard is issued under the fixed designation B680; 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.
1. Scope 3. Significance and Use
3.1 This test method describes a destructive test procedure
1.1 This test method covers a test for the quality of seal of
for measuring the degree of seal of the porosity in anodic oxide
porous anodic coatings on aluminum and its alloys. It is based
coatings. Low coating mass loss is an indication of good seal
upon the loss in mass of the coating after immersion in a warm
quality and of the ability of the coating to resist staining and
phosphoric-chromic acid solution.
“blooming” in many types of service.
1.2 This test method is applicable to anodic coatings in-
3.2 This test method is suitable for quality control purposes
tended for exposure to the weather, or for protective purposes
within manufacturing operations and for determining whether
in corrosive media, and where resistance to staining is impor-
anodized parts meet seal quality requirements in applicable
tant.
specifications.
1.3 This test method is not applicable to:
1.3.1 Hard coatings, which normally are not sealed. 4. Apparatus
1.3.2 Anodic coatings that have been sealed only in dichro-
4.1 Laboratory Balance, accurate to 1 mg.
mate solutions.
4.2 Glass Container, means of heating and stirring, and a
1.3.3 Anodic coatings that have undergone a treatment to
thermometer. There shall be no metal in contact with the test
render them hydrophobic.
specimen or the solution.
1.4 The values stated in SI units are to be regarded as
5. Acid Test Solution
standard. No other units of measurement are included in this
standard.
5.1 The test solution shall have the following makeup:
1.5 This standard does not purport to address all of the Chromic acid anhydride (CrO ) 20±0.5g
Orthophosphoric acid of 85 mass %, density 1.69 35 ± 0.5 mL
safety concerns, if any, associated with its use. It is the
Distilled or deionized water conforming with Type III 1000 mL
responsibility of the user of this standard to establish appro-
Reagent Water of Specification D1193, to make
up to
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
NOTE 1—This solution is commonly referred to as a “stripping
solution” for anodic coatings and is of the same composition as that
employedinTestMethodB137.Thissolutiondissolvestheanodiccoating
2. Referenced Documents
with no significant attack of the substrate metal.
2.1 ASTM Standards:
5.2 The test solution may be used repeatedly but shall be
B137 Test Method for Measurement of Coating Mass Per
discarded after1gof anodic coating has been dissolved per
Unit Area on Anodically Coated Aluminum
litre of solution.
D1193 Specification for Reagent Water
NOTE 2—The solution may be used for as many as 20 test specimens
per litre provided that the average mass loss does not exceed 50 mg per
specimen.
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.07 on
6. Preparation of Test Specimen
Conversion Coatings.
Current edition approved April 15, 2009. Published June 2009. Originally 6.1 Select an uncontaminated specimen having an area
approved in 1980. Last previous edition approved in 2004 as B680 – 80 (2004).
about 1 dm of the anodized surface to be teste
...

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