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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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超细晶304L不锈钢在含Cl-溶液中点蚀行为的研究
DOI: 10.11900/0412.1961.2015.00062, PP. 1077-1084
Keywords: 304L不锈钢,等通道转角挤压,超细晶,钝化膜,点蚀
Abstract:
采用动电位极化、循环极化、电化学阻抗谱、Mott-Schottky曲线结合表面形貌观察,研究了利用等通道转角挤压方法制备的晶粒尺寸为(130±30)nm的超细晶304L不锈钢在含Cl-溶液(0.05mol/LH2SO4+0.05mol/LNaCl)中的点蚀行为.研究表明,超细晶材料比粗晶材料具有更高的腐蚀电流密度和钝化电流密度,更低的腐蚀电位、破钝电位和保护电位,且钝化区更窄.严重塑性变形引起304L不锈钢材料晶粒显著细化,一方面增加了表面钝化膜的施主密度和扩散系数,降低了钝化膜的致密性,使Cl-在材料表面的吸附能力增强;另一方面增加了晶界含量,使Cl-沿晶界向内扩散能力增强,促进了点蚀形核和长大.
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