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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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B374 Terminology Relating to Electroplating
B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings
B697 Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings
B762 Test Method of Variables Sampling of Metallic and Inorganic Coatings
C664 Test Methods for Thickness of Diffusion Coating
D3951 Practice for Commercial Packaging
E766 Practice for Calibrating the Magnification of a Scanning Electron Microscope
E1077 Test Methods for Estimating the Depth of Decarburization of Steel Specimens
F1330 Guide for Metallic Abrasive Blasting to Descale the Interior of Pipe
ICS Number Code 25.220.40 (Metallic coatings)
ASTM B874-96, Standard Specification for Chromium Diffusion Coating Applied by Pack Cementation Process, ASTM International, West Conshohocken, PA, 1996, www.astm.orgBack to Top