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304L不锈钢在ZnSO_4和Na_2SO_4两种高温高压水溶液中腐蚀后表面形成一层钝化膜,对腐蚀后样品在硼酸缓冲溶液(pH8.4)中进行动电位扫描,并绘制其Mott-Schottky(M-S)曲线;利用光电流法,绘制(I_(ph)hv/I_O)~(1/2)-光子能量曲线,详细分析表面钝化膜半导体性质。结果表明:含锌样品表面钝化膜呈现多层结构;钝化膜的半导体类型为n型(不含锌样品钝化膜呈p型);平带电位负移;载流子浓度降低;Zn~(2+)对304L不锈钢钝化膜半导体的结构及性质有较大的影响。
304L stainless steel formed a passivation film on the surface of ZnSO 4 and Na 2 SO 4 aqueous solution after etching. The corrosion samples were subjected to potentiodynamic scanning in boric acid buffer solution (pH 8.4), and their Mott-Schottky (MS) (I_ (ph) hv / I_O) ~ (1/2) - photon energy curve was obtained by photocurrent method. The semiconductor properties of surface passivation films were analyzed in detail. The results show that the passivating film on the surface of zinc-containing samples has a multilayer structure. The passivating film has a n-type semiconductor (p-type with no zinc), a negative shift of the flat band potential, a decrease of carrier concentration, ~ (2+) has a great influence on the structure and properties of 304L stainless steel passivation film semiconductors.