Codeposition of chromium and silicon diffusion coatings in FE-ba

Details Codeposition of chromium and silicon diffusion coatings in FE-ba Codeposition of chromium and silicon diffusion coatings in FE-ba

1993-09-03

1994-11-15

Konopka, Paul E.

Coating processes

Coating by vapor, gas, or smoke

Metal coating

4272551, C23C 1600

Patent

active

053646592

ABSTRACT:
Diffusion coatings incorporating approximately 18 to 35 wt % Cr and 1 to 3% Si in 2.25Cr-1.0Mo steel and 1018 steel have been produced using a pack cementation method. The codeposition of these concentrations of Cr and Si into the 2.25Cr-1.0Mo and 1018 steel requires the use of a "mixed activator" (fused salt solution of NaF and NaCl). Cyclic oxidation tests in air at 700.degree. C. of a coated 2.25Cr-1.0Mo steel coupon with a surface concentration of 34Cr-3Si have shown excellent cyclic oxidation resistance. Furthermore, a 1018 coupon coated to a surface concentration of Fe-30 wt % Cr-3Si shows negligible aqueous corrosion in an aerated 3.5% NaCl solution at room temperature. These coatings have provided similar protection in more complex oxidizing and reducing atmospheres.

REFERENCES:
patent: 3061463 (1962-10-01), Samuel
patent: 4041196 (1977-08-01), Baldi et al.
patent: 4096296 (1978-06-01), Galmiche et al.
patent: 4156042 (1979-05-01), Hayman et al.
patent: 4208453 (1980-06-01), Baldi
patent: 4290391 (1981-09-01), Baldi
patent: 4471008 (1984-09-01), Huther
patent: 4687684 (1987-08-01), Restall et al.
patent: 4812179 (1989-03-01), Sayles
patent: 4904501 (1990-02-01), Davis
patent: 5041309 (1991-08-01), Davis et al.
Harper, Mark A., "Simultaneous Chromizing-Siliconizing of 409 Stainless Steel and Interstitial-Free Steel", ASM International Undergraduate Paper Contest, Jun., 1989.
Rapp, Robert A., "Pack Cementation Coating of Steel for High-Temperature Applications", Corrosion 88, St. Louis, Mo., Mar. 21-25, 1988.
Choquet, P. A., Harper, M. A., and Rapp, R. A., "Chromizing-Aluminizing and Chromizing-Siliconizing Coating of a Ferritic Steel", The Proceedings of the 7th European Conference, Perpignan, France, Jun. 19-23, 1989.
Harper, Mark A. and Rapp, Robert A., "Chromized/Siliconized Diffusion Coatings for Iron-Base Alloys by Pack Cementation", Corrosion 91, Cincinnati, Ohio, Mar. 11-15, 1991.
Harper, Mark A. and Rapp, Robert A., "Chromized/Siliconized Pack Cementation Diffusion Coatings for Heat Resistant Alloys," ASM Conference, Fontana, Wis., Sep. 23-26, 1991.
Harper, M. A. and Rapp R. A., "Codeposition of Chromium and Silicon in Diffusion Coatings for Iron-Base Alloys Using Pack Cementation", Surface Modification Technologies IV, Mar. 29, 1991.
Bianco, Robert, Harper, M. A., and Rapp, R. A., "Codeposition of Elements in Diffusion Coatings by the Halide Activated Pack Cementation Method," Journal of Metals, Nov. 1991.
Galmiche, Philippe, "Chromaluminisation et Tantalisation des Materiaux Refractaires pour Turbines a Gaz, Metals and Materials", 1968.

Affiliated with

Also associated with

Rating

Codeposition of chromium and silicon diffusion coatings in FE-ba does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Codeposition of chromium and silicon diffusion coatings in FE-ba, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Codeposition of chromium and silicon diffusion coatings in FE-ba will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1095910