论文标题
钝化机制和氧化前对Fecrni奥氏体不锈钢模型表面的影响
Passivation mechanisms and pre-oxidation effects on model surfaces of FeCrNi austenitic stainless steel
论文作者
论文摘要
在（100）面向的FE-18CR-13NI表面上研究了钝化机制，并通过X射线光电光谱和扫描隧道显微镜和电化学表征在表面制备与分析之间直接转移。从无氧化物表面开始，在超低压力（ULP）下饱和的氧化明显促进了氧化物膜CR（III）富集，并在含水环境中随后氧化铁氧化。在开路电势下暴露于氧化铁物种的优先溶解。阳极钝化会迫使氧化物膜的重新生长，Cr（III）脱氢氧和进一步的富集。 ULP前氧化促进了在开路电位，纳米氧化物膜的紧凑性和腐蚀保护下的CR（III）氢氧化物形成。
Passivation mechanisms were investigated on (100)-oriented Fe-18Cr-13Ni surfaces with direct transfer between surface preparation and analysis by X-ray photoelectron spectroscopy and scanning tunneling microscopy and electrochemical characterization. Starting from oxide-free surfaces, pre-oxidation at saturation under ultra-low pressure (ULP) oxygen markedly promotes the oxide film Cr(III) enrichment and hinders/delays subsequent iron oxidation in water-containing environment. Exposure to sulfuric acid at open circuit potential causes preferential dissolution of oxidized iron species. Anodic passivation forces oxide film re-growth, Cr(III) dehydroxylation and further enrichment. ULP pre-oxidation promotes Cr(III) hydroxide formation at open circuit potential, compactness of the nanogranular oxide film and corrosion protection.
