表面粗糙度对硝酸钝化304不锈钢点蚀行为影响

发布时间：2018-03-30 20:22

本文选题：不锈钢　切入点：点腐蚀　出处：《腐蚀与防护》2015年12期

【摘要】：采用动电位扫描、电化学阻抗谱和电化学噪声等方法研究了不同表面粗糙度的304不锈钢在体积分数10%HNO3溶液中钝化后的耐蚀性。结果表明,随304不锈钢钝化前表面粗糙度从0.25μm降到0.10μm,电荷转移电阻从6.51kΩ·cm2上升到19.17kΩ·cm2,电位标准偏差和电流标准偏差降低,而噪声电阻增大;随表面粗糙度的增大,试样电位和电流的功率密度曲线线性部分的斜率均出现增大,谱噪声曲线线性部分的斜率下降,表明在光滑的不锈钢表面更容易形成致密稳定且耐腐蚀性强的氧化膜,硝酸钝化能显著改善304不锈钢耐点蚀性能。
[Abstract]:The corrosion resistance of 304 stainless steel with different surface roughness after passivation in 10%HNO3 solution with different surface roughness was studied by potentiodynamic scanning, electrochemical impedance spectroscopy and electrochemical noise. As the surface roughness of 304 stainless steel decreases from 0.25 渭 m to 0.10 渭 m, the charge transfer resistance increases from 6.51 k 惟 cm2 to 19.17 k 惟 cm 2, the standard potential deviation and current standard deviation decrease, but the noise resistance increases, and the surface roughness increases with the increase of surface roughness. The slope of the linear part of the power density curve of the potential and current increases, and the slope of the linear part of the spectral noise curve decreases, which indicates that it is easier to form a dense and stable oxide film with strong corrosion resistance on the smooth surface of stainless steel. The pitting corrosion resistance of 304 stainless steel can be significantly improved by nitric acid passivation.
【作者单位】：南昌航空大学材料科学与工程学院;佛山科学技术学院理学院;上海民航职业技术学院;
【基金】：佛山市科技计划项目(2014AG10009) 佛山市高明区产学研项目(201205)
【分类号】：TG142.71

【参考文献】