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ASTM D 1732 : 2003 : R2018

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Practices for Preparation of Magnesium Alloy Surfaces for Painting
Available format(s)

Hardcopy , PDF

Superseded date

13-11-2023

Language(s)

English

Published date

24-10-2018

These practices cover two classes of treatment for preparation of magnesium alloy surfaces for painting, as follows: Class I—Chemical Treatments. Class II—Anodic Treatments.

1.1These practices cover two classes of treatment for preparation of magnesium alloy surfaces for painting, as follows:

Class I—Chemical Treatments.

Class II—Anodic Treatments.

In general, the latter treatments are the more protective of the two classes. Mechanical (abrasive) treatments, solvent cleaning, alkaline solution treatments, and acid pickles not resulting in protective conversion coatings are suitable preliminary treatments only for metal to be exposed under mildly corrosive (indoor) exposures. When a high degree of corrosion protection and paint adhesion are desired, as in many outdoor environments, surface preparation by one of the above conversion-coat classes is necessary. The hexavalent chromium based methods given are not recommended as hexavalent chromium is a known carcinogen.

Note 1:Testing of Coatings—Quality control tests of coatings are frequently desirable, and these generally consist of exposures, with or without paint, to salt spray, humidity, or natural environments, with suitable procedures for assessing the degree of breakdown suffered after fixed time intervals. It is recommended that quality control tests of coatings shall be made as far as possible with high-purity material (for example AZ31A alloy),2 the inherent corrosion rate of which is relatively consistent from batch to batch and that precautions shall be taken to remove surface contamination before coatings are applied. Such contamination shall be removed by acid pickling to a depth of at least 0.001 in. (25 μm) per side.

1.2This standard may involve hazardous materials, operations, and equipment. 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. (See Note 11.)

1.3This 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.

Committee
B 08
DevelopmentNote
Supersedes MIL M 45202 (07/2000)
DocumentType
Standard Practice
Pages
8
ProductNote
Reconfirmed 2003 DESIGNATION EDITED ARTEFACT ATTACHED ICS CODE ADDED
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

ASTM B 905 : 2000 : R2021 Standard Test Methods for Assessing the Adhesion of Metallic and Inorganic Coatings by the Mechanized Tape Test
ASTM B 879 : 2017 : R2022 Standard Practice for Applying Non-Electrolytic Conversion Coatings on Magnesium and Magnesium Alloys
ASTM D 6577 : 2015 : R2019 Standard Guide for Testing Industrial Protective Coatings
ASTM D 3322 : 2023 Standard Practice for Testing Primers and Primer Surfacers Over Preformed Metal
ASTM B 660 : 2021 Standard Practices for Packaging/Packing of Aluminum and Magnesium Products
ASTM B 879 : 2017 Standard Practice for Applying Non-Electrolytic Conversion Coatings on Magnesium and Magnesium Alloys
ASTM D 3451 : 2006 : R2017 Standard Guide for Testing Coating Powders and Powder Coatings
ASTM B 660 : 2015 Standard Practices for Packaging/Packing of Aluminum and Magnesium Products
ASTM D 3322 : 1982 : R2017 Standard Practice for Testing Primers and Primer Surfacers Over Preformed Metal
ASTM B 905 : 2000 : R2016 Standard Test Methods for Assessing the Adhesion of Metallic and Inorganic Coatings by the Mechanized Tape Test
ASTM D 6577 : 2015 Standard Guide for Testing Industrial Protective Coatings

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