ASTM-B879 Standard Practice for Applying Non-Electrolytic Conversion Coatings on Magnesium and Magnesium Alloys

ASTM-B879 - 2017 R22 EDITION - CURRENT
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Standard Practice for Applying Non-Electrolytic Conversion Coatings on Magnesium and Magnesium Alloys
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Scope

1.1 this practice covers a guide for metal finishers to clean and then provide a paint base for the finishing of magnesium and magnesium alloys using chemical conversion coatings. Where applicable (for example, aerospace) secondary supplementary coatings (for example, surface sealing) can be used (see Appendix X1).

1.2 Although primarily intended as a base for paint, chemical conversion coatings provide varying degrees of surface protection for magnesium parts exposed to indoor atmosphere either in storage or in service under mild exposure conditions. An example is the extensive use of the dichromate treatment (see 3.2) as a final coating for machined surfaces of die cast magnesium components in the computer industry.

1.3 The traditional numbering of the coating is used throughout.

1.4 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.

Keywords

chemical conversion coatings; chromates; cleaning magnesium; preparation for painting; protection; surface sealing

To find similar documents by ASTM Volume:

02.05 (Metallic and Inorganic Coatings; Metal Powders and Metal Powder Products)

To find similar documents by classification:

77.120.20 (Magnesium and magnesium alloys)

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Document Number

ASTM-B0879-17R22

Revision Level

2017 R22 EDITION

Status

Current

Modification Type

New

Publication Date

June 7, 2022

Document Type

Practice

Page Count

11 pages

Committee Number

B08.07