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Codeposition of chromium and silicon diffusion coatings in FE- base alloys using pack cementation
Codeposition of chromium and silicon diffusion coatings in FE- base alloys using pack cementation
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机译:使用填充胶结法在FE基合金中铬和硅扩散涂层的共沉积
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摘要
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° 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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