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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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块体超细晶304L不锈钢的腐蚀及钝化性能的研究
DOI: 10.3724/SP.J.1037.2012.00616, PP. 265-270
Keywords: 304L不锈钢,超细晶,耐蚀性能,钝化,等通道转角挤压
Abstract:
利用等通道转角挤压(ECAP)方法,制备出平均晶粒尺寸为(130±30)nm的块体超细晶304L不锈钢.在0.05mol/LH2SO4+0.25mol/LNa2SO4溶液中测量了其极化曲线和钝化性能的Mott-Schottky曲线.结果表明,与粗晶合金相比,超细晶材料的自腐蚀电位更低,自腐蚀电流密度更大,更易发生活性溶解且溶解速度更快,但致钝电位更低,维钝电流密度更小,钝化区间更宽.表面钝化膜均具有n型半导体特征,超细晶粒有助于304L不锈钢表面形成更为稳定的钝化膜,载流子密度更小,载流子的扩散系数更低.
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