304不锈钢点蚀行为的电化学阻抗谱研究
304 Stainless Steel Pitting Behavior by Means of Electrochemical Impedance Spectroscopy
查看参考文献19篇
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文摘
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综合运用动电位电化学阻抗谱(DEIS)和时间扫描模式下的电化学阻抗谱(TSEIS)研究了304不锈钢在3.5%(质量分数)NaCl溶液中的点蚀行为。DEIS的结果表明,在比点蚀电位0.15V负得多的电位0.02V下,亚稳态点蚀就已经开始,并且亚稳态蚀孔的产生与再钝化是随机的,DEIS测试得到的稳态点蚀电位比动电位极化法得到的点蚀破裂电位要负0.05V。TSEIS的结果表明,只有在钝化膜减薄到一定程度后,点蚀的形核才能发生。通过对等效电路中元件参数的分析,揭示了点蚀发展过程中双电层和钝化膜结构的变化特点。 |
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其他语种文摘
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Pitting behavior of 304 stainless steel in 3.5% (mass fraction) NaCl solution was investigated by dynamic potential electrochemical impedance spectroscopy (DEIS) and time scan electrochemical impedance spectroscopy (TSEIS). The results of DEIS show that metastable pits emerge at the potential (0.02V) which is more negative than the pitting potential (0.15V), and the generation and passivation of metastable pits are stochastic. The steady pitting potential which got from DEIS is negative than breakdown potential which got from dynamic potential polarization by 0.05V. The results of TSEIS indicate that pitting nucleation can happen just when the thickness of passivation film has been reduced to some extent. It reveals the characteristics of the structure of electric double layer and passivation film by analyzing element parameter of the equivalent circuit. |
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来源
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材料工程
,2014(6):68-73 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2014.06.013
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关键词
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304不锈钢
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点蚀
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动电位电化学阻抗谱
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时间扫描电化学阻抗谱
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地址
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南昌航空大学, 轻合金加工科学与技术国防重点学科实验室, 南昌, 330063
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金资助项目
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文献收藏号
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CSCD:5157535
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