Coating processes – Coating by vapor – gas – or smoke – Metal coating
Patent
1994-05-10
1996-02-20
King, Roy V.
Coating processes
Coating by vapor, gas, or smoke
Metal coating
427252, 4272551, 4271261, C23C 1600
Patent
active
054927277
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: 4240087 (1990-12-01), Kreuse et al.
patent: 4294520 (1981-10-01), Inoue et al.
patent: 4702963 (1987-10-01), Phillips et al.
patent: 5364659 (1994-11-01), Rapp et al.
patent: 5371433 (1994-12-01), Horne 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 Enery Materials, May 11-13, 1993 Oak Ridge, Tennessee, pp. 259-268.
Wan, X., Wang, G., and Rapp, R., "Resistance to Aqueous Corrosion of Steels Protected by a Cr-Si Diffusion Coating," 12th Int. Corrosion Congress Proceedings, Sep. 19-24, 1993, Houston, Texas pp. 353-369.
Pangestuti Endang
Rapp Robert A.
Wang Ge
King Roy V.
The Ohio State University Research Foundation
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