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ASTM International - ASTM D1732-03(2008)

Standard Practices for Preparation of Magnesium Alloy Surfaces for Painting

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Organization: ASTM International
Publication Date: 1 April 2008
Status: inactive
Page Count: 8
ICS Code (Paint coating processes): 87.020
scope:

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. 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), 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.

1.2 This 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 and health practices and determine the applicability of regulatory limitations prior to use. (See Note 11.)

abstract:

This specification covers chemical treatments and anodic treatments for preparation of magnesium alloy surfaces for printing. The procedure for preliminary treatment of surfaces using alkaline... View More

Document History

October 1, 2018
Standard Practices for Preparation of Magnesium Alloy Surfaces for Painting
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...
May 1, 2013
Standard Practices for Preparation of Magnesium Alloy Surfaces for Painting
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...
ASTM D1732-03(2008)
April 1, 2008
Standard Practices for Preparation of Magnesium Alloy Surfaces for Painting
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...
September 10, 2003
Standard Practices for Preparation of Magnesium Alloy Surfaces for Painting
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...
November 10, 1998
Standard Practices for Preparation of Magnesium Alloy Surfaces for Painting
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...
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