Method of depositing chromium and silicon on a metal to form a d

Details Method of depositing chromium and silicon on a metal to form a d Method of depositing chromium and silicon on a metal to form a d

1995-10-30

1996-12-31

Utech, Benjamin

Coating processes

Electrical product produced

Metallic compound coating

427252, 427253, 4272551, 427379, B05D 512

Patent

active

055892205

ABSTRACT:
A method for the simultaneous deposition of chromium and silicon to form a diffusion coating on a workpiece uses a halide-activated cementation pack with a dual halide activator. Elemental metal powders may be employed with the dual activator. A two-step heating schedule prevents blocking a chromium carbide from forming at the surface of the workpiece. Small contents of either Ce or V can be added to the Cr+Si contents of the coating by introducing oxides of Ce or V into the filler of the pack.

REFERENCES:
patent: 5364659 (1994-11-01), Rapp et al.
patent: 5492727 (1996-02-01), Rapp et al.
Wan, X., Wang, G., and Rapp, R., "Resistance To Aqueous Corrosion Of Steels Protected By A Cr-Si Diffusion Coating," Proceedings of the Seventh Annual Conference on Fossil Energy Materials, May 11-13, 1993 Oak Ridge, Tennessee, pp. 259-268.

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