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  • ASTM
    B874-96(2013) Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process
    Edition: 2013
    $82.37
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Description of ASTM-B874 2013

ASTM B874-96-Reapproved2013

Historical Standard: Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process




ASTM B874

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.


Keywords

chromizing; corrosion-resistant coatings; diffusion coating; pack cementation


ICS Code

ICS Number Code 25.220.40 (Metallic coatings)


DOI: 10.1520/B0874-96R13

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