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ASTM B874

Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process

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Organization: ASTM
Publication Date: 10 June 1996
Status: inactive
Page Count: 3
ICS Code (Metallic coatings): 25.220.40
scope:

1. Scope

1.1 This specification covers the requirements for chromium diffusion of metals by the pack cementation method. Pack diffusion employs the chemical vapor deposition of a metal which is subsequently diffused into the surface of a substrate at high temperature. The material to be coated (substrate) is immersed or suspended in a powder containing chromium (source), a halide salt (activator), and an inert diluent such as alumina (filler). When the mixture is heated, the activator reacts to produce an atmosphere of chromium halides which transfers chromium to the substrate for subsequent diffusion. The chromium-rich surface enhances corrosion, thermal stability, and wear-resistant properties.

1.2 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.

Document History

June 10, 1996
Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process
This specification covers the requirements for chromium diffusion of metals by the pack cementation method. Pack diffusion employs the chemical vapor deposition of a metal which is subsequently...
June 10, 1996
Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process
This specification covers the requirements for chromium diffusion of metals by the pack cementation method. Pack diffusion employs the chemical vapor deposition of a metal which is subsequently...
June 10, 1996
Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process
This specification covers the requirements for chromium diffusion of metals by the pack cementation method. Pack diffusion employs the chemical vapor deposition of a metal which is subsequently...
June 10, 1996
Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process
This specification covers the requirements for chromium diffusion of metals by the pack cementation method. Pack diffusion employs the chemical vapor deposition of a metal which is subsequently...
ASTM B874
June 10, 1996
Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process
1. Scope 1.1 This specification covers the requirements for chromium diffusion of metals by the pack cementation method. Pack diffusion employs the chemical vapor deposition of a metal which is...

References

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