Coating processes – Coating by vapor – gas – or smoke – Metal coating
Patent
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.
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Harper Mark A.
Rapp Robert A.
Edwards Robert J.
Kalka Daniel S.
Konopka Paul E.
Ohio State University Research Foundation
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