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ASTM D 1732 : 1967 : R1998

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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Superseded date

09-10-2020

Published date

01-01-1998

1.1 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.

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.

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), 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 [mu]m) per side.

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 whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.> (See Note 11.)

Committee
B 08
DocumentType
Standard Practice
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy

ASTM B 905 : 2000 : R2016 Standard Test Methods for Assessing the Adhesion of Metallic and Inorganic Coatings by the Mechanized Tape Test
ASTM D 3322 : 1982 : R2017 Standard Practice for Testing Primers and Primer Surfacers Over Preformed Metal
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 6577 : 2015 Standard Guide for Testing Industrial Protective Coatings

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