409L铁素体不锈钢的表面钝化膜性能

用辉光光谱仪(GDS)、扫描电镜(SEM)和X-射线光电子能谱仪(XPS)分析了经20%HNO₃、58℃0～60 min钝化的409L冷轧不锈钢(%:0.017C、11.50Cr、0.17Ti)表面钝化膜的性能,并通过盐雾试验得出钝化膜厚度对耐蚀性的影响。结果表明,当钝化时间为10 min时,钝化膜厚度达到最大值48 nm;当钝化时间为3 min时,钝化膜厚度为40 nm,试样表面氮化物完全被钝化膜覆盖,膜中Cr的氧化物含量最多,耐蚀性最好。

Properties of Surface Passivating Film of Ferritic Stainless Steel 409L

The properties of surface passivating film of  cold  rolled stainless steel 409L(%:0.017C,11.50Cr,  0. 17Ti) passivated in 20%HNO₃ solution at 58 ℃ for 0～60 min have been analyzed by using glow discharge emission spectrometry (GDS),scanning electron microscope(SEM)and X-ray photoelectron spectroscopy(XPS),and the effect of passivating film thickness on its corrosion resistance has been got by salt spray test.Results showed that with passivating for 10 min,the passivating film thickness was up to maximum 48 nm;and with passivating for 3 min,the passivating film thickness was 40 nm;the surface nitrides of sample were completely covered by passivating film and the content of chromium oxide was most with best corrosion resistance.