The codeposition of two or more elementli in II halide-activated cementation pack is inherently difficult because of large differences in the thermodynamic stabilities for tlreir volatile halides. However, through II computer-assisted analysis of the pack equilibria, combiniltions of suitable masteralloys and activator salts can be identified. The codepositwn of chromium plusaluminum or chromium plus silicon by pack cementation has yielded diffusion coatings with excellent resistance to higll-tempemtureoxidation and corrosion fora wide range of alloy substrates.

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