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Codeposition of chromium and silicon diffusion coatings in FE- base alloys using pack cementation

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

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.
机译:使用填充胶结法已经生产出在2.25Cr-1.0Mo钢和1018钢中掺入约18-35 wt%Cr和1-3%Si的扩散涂层。这些浓度的Cr和Si在2.25Cr-1.0Mo和1018钢中的共沉积要求使用“混合活化剂”(NaF和NaCl的熔融盐溶液)。涂覆的2.25Cr-1.0Mo钢试样的表面浓度为34Cr-3Si的700℃空气中的循环氧化测试显示出优异的抗循环氧化性能。此外,涂覆到表面浓度为Fe-30 wt%Cr-3Si的1018试样在室温下在充气的3.5%NaCl溶液中显示出可忽略的水性腐蚀。这些涂层在更复杂的氧化和还原气氛中提供了类似的保护。

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