ASTM-B879 2008

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B879-97(2008)e1 Standard Practice for Applying Non-Electrolytic Conversion Coatings on Magnesium and Magnesium Alloys

Published By	Publication Date	Number of Pages
ASTM	2008	11

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Categories: 77.120.20 - Magnesium and magnesium alloys, ASTM

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Description

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 5.2) 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Significance and Use Reagents Types of Coating
2	TABLE 1
3	Part Preparation
5	Application of Coatings
7	Keywords X1. SURFACE SEALING OF MAGNESIUM ALLOY COMPONENTS X1.1 X1.3 Coating Procedure
8	X2. CONTROL OF TREATMENT PROCESSES X2.1 Chrome Pickle Treatment X2.2 Nitric Acid Determination X2.3 Control Limits of Chrome Pickle Bath X2.4 Problems and Explanations
9	X2.5 Dichromate Treatment X2.6 Chromate Treatment
10	X2.7 Chrome-Manganese Treatment X2.8 Galvanic Chromate Treatment X2.9 Semi-Bright Pickle Treatment X2.10 Phosphate Treatment

Additional information

Standard Title	B879-97(2008)e1 Standard Practice for Applying Non-Electrolytic Conversion Coatings on Magnesium and Magnesium Alloys
Published Code	ASTM
Publication Date	2008
Pages Count	11
ICS Codes	77.120.20 - Magnesium and magnesium alloys

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ASTM-B879 2008

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