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ASTM B680-80(2000)

(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

SCOPE
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.
1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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
09-Mar-2000
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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Replaced By
ASTM B680-80(2004) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
Effective Date
01-Oct-2004

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ASTM B680-80(2000) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid DissolutionASTM B680-80(2000) - Standard Test Method for Seal Quality of Anodic Coatings on Aluminum by Acid Dissolution
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ASTM B680-80(2000) - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 680 – 80 (Reapproved 2000)
Standard Test Method for
Seal Quality of Anodic Coatings on Aluminum by Acid
Dissolution
This standard is issued under the fixed designation B 680; 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.
1. Scope coatings. Low coating mass loss is an indication of good seal
quality and of the ability of the coating to resist staining and
1.1 This test method covers a test for the quality of seal of
“blooming” in many types of service.
porous anodic coatings on aluminum and its alloys. It is based
3.2 This test method is suitable for quality control purposes
upon the loss in mass of the coating after immersion in a warm
within manufacturing operations and for determining whether
phosphoric-chromic acid solution.
anodized parts meet seal quality requirements in applicable
1.2 This test method is applicable to anodic coatings in-
specifications.
tended for exposure to the weather, or for protective purposes
in corrosive media, and where resistance to staining is impor-
4. Apparatus
tant.
4.1 Laboratory Balance, accurate to 1 mg.
1.3 This test method is not applicable to:
4.2 Glass Container, means of heating and stirring, and a
1.3.1 Hard coatings, which normally are not sealed.
thermometer. There shall be no metal in contact with the test
1.3.2 Anodic coatings that have been sealed only in dichro-
specimen or the solution.
mate solutions.
1.3.3 Anodic coatings that have undergone a treatment to
5. Acid Test Solution
render them hydrophobic.
5.1 The test solution shall have the following makeup:
1.4 This standard does not purport to address all of the
Chromic acid anhydride (CrO)20 6 0.5 g
safety concerns, if any, associated with its use. It is the
Orthophosphoric acid of 85 mass %, density 1.69 35 6 0.5 mL
responsibility of the user of this standard to establish appro-
Distilled or deionized water conforming with Type III 1000 mL
Reagent Water of Specification D 1193, to make
priate safety and health practices and determine the applica-
up to
bility of regulatory limitations prior to use.
NOTE 1—This solution is commonly referred to as a “stripping solu-
2. Referenced Documents
tion” for anodic coatings and is of the same composition as that employed
in Method B 137. This solution dissolves the anodic coating with no
2.1 ASTM Standards:
significant attack of the substrate metal.
B 137 Test Method for Measurement of Coating Mass Per
Unit Area on Anodically Coated Aluminum 5.2 The test solution may be used repeatedly but shall be
discarded after1gof anodic coating has been dissolved per
D 1193 Specification for Reagent Water
litre of solution.
2.2 International Standard:
ISO 3210 Anodizing of Aluminum and Its Alloys—
NOTE 2—The solution may be used for as many as 20 test specimens
Assessment of Sealing Quality by Measurement of the
per litre provided that the average mass loss does not exceed 50 mg per
Loss of Mass After Immersion in Phosphoric-Chromic
specimen.
Acid Solution
6. Preparation of Test Specimen
3. Significance and Use
6.1 Select an uncontaminated specimen having an area
3.1 This test method describes a destructive test procedure
about 1 dm of the anodized surface to be tested.
for measuring the degree of seal of the porosity in anodic oxide
6.2 The mass of the specimen shall not exceed 200 g.
6.3 When it is desired to conduct the test on one face only
of the specimen, the anodic coating on the other s
...

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Standard Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings

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4.1 Porosity tests indicate the completeness of protection or coverage offered by the coating. When a given coating is known to be protective when properly deposited, the porosity serves as a measure of the control of the process. The effects of substrate finish and preparation, plating bath, coating process, and handling, may all affect the degree of imperfection that is measured.
Note 1: The substrate exposed by the pores may be the basis metal, an underplate, or both.  
4.2 The tests in this guide involve corrosion reactions in which the products delineate pores in coatings. Since the chemistry and properties of these products may not resemble those found in service environments, these tests are not recommended for prediction of product performance unless correlation is first established with service experience.
SCOPE
1.1 This guide describes some of the available standard methods for the detection, identification, and measurement of porosity and gross defects in electrodeposited and related metallic coatings and provides some laboratory-type evaluations and acceptances. Some applications of the test methods are tabulated in Table 1 and Table 2.    
1.2 This guide does not apply to coatings that are produced by thermal spraying, ion bombardment, sputtering, and other similar techniques where the coatings are applied in the form of discrete particles impacting on the substrate.  
1.3 This guide does not apply to beneficial or controlled porosity, such as that present in microdiscontinuous chromium coatings.  
1.4 Porosity test results (including those for gross defects) occur as chemical reaction end products. Some occur in situ, others on paper, or in a gel coating. Observations are made that are consistent with the test method, the items being tested, and the requirements of the purchaser. These may be visual inspection (unaided eye) or by 10× magnification (microscope). Other methods may involve enlarged photographs or photomicrographs.  
1.5 The test methods are only summarized. The individual standards must be referred to for the instructions on how to perform the tests.  
1.6 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
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Standard Practice for Qualitative Adhesion Testing of Metallic Coatings

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2.1 These tests are useful for production control and for acceptance testing of products.  
2.2 Interpreting the results of qualitative methods for determining the adhesion of metallic coatings is often a controversial subject. If more than one test is used, failure to pass any one test is considered unsatisfactory. In many instances, the end use of the coated article or its method of fabrication will suggest the technique that best represents functional requirements. For example, an article that is to be subsequently formed would suggest a draw or a bend test; an article that is to be soldered or otherwise exposed to heat would suggest a heat-quench test. If a part requires baking or heat treating after plating, adhesion tests should be carried out after such posttreatment as well.  
2.3 Several of the tests are limited to specific types of coatings, thickness ranges, ductility, or compositions of the substrate. These limitations are noted generally in the test descriptions and are summarized in Table 1 for certain metallic coatings. (A) + Appropriate; − not appropriate.    
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1.1 This practice covers simple, qualitative tests for evaluating the adhesion of metallic coatings on various substances.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 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.  
1.4 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.

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