中文摘要：

通过熔盐非电解沉积法在0Cr18Ni9不锈钢表面进行渗硅处理。试验表明,当温度达到800℃渗硅时间为10 h时,在不锈钢基体上产生约500μm的富含Cr、Ni合金元素的Fe3Si型硅化物渗层。采用X射线衍射仪（XRD）分析了渗硅层的物相组成,用附带能量色散谱仪（EDS）附件的扫描电子显微镜（SEM）研究了渗层截面的形貌和成分。通过氧化质量增加的方法,比较了渗硅试样和0Cr18Ni9不锈钢在800℃下的循环氧化行为。结果表明,经过渗硅处理后不锈钢的氧化质量增加明显小于不经过硅化处理的0Cr18Ni9不锈钢的氧化质量增加,其原因是在循环氧化的时,发生了Si、Cr原子从基体到渗层的上坡扩散,并且在内外氧化层中产生了偏聚的SiO2、Cr2O3等氧化产物,从而对基体起到很好的保护作用。

英文摘要：

Fe3Si composite coating was prepared with a thickness of about 500 μm on 0Cr18Ni9 stainless steel at 800 ℃ for 10 h in the molten salt consisting of NaCl,KCl,Na2SiF6 and Si powder.The phase of the siliconized layer was analyzed by X ray diffraction.The micrographs and composition of the siliconized layer in cross section were studied by scanning electron microscope attached with energy dispersive X-ray spectrometer（EDS）.Compared with the bare 0Cr18Ni9 stainless steel,the siliconized coating exhibits an excellent oxidation resistance.The composite oxide film containing SiO2 and Cr2O3 results from the uphill diffusion of Cr and Si at 800 ℃ in the interface between the substrate and the coating,and the presence of SiO2 and Cr2O3 in the coating surface accounts for the excellent high temperature oxidation resistance.