| pH值和溶解氧对低碳钢点蚀诱发的影响 |
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| 引用本文： | 曹国良,李国民,常万顺,陈珊,陈学群.pH值和溶解氧对低碳钢点蚀诱发的影响[J].装备环境工程,2009,6(6):9-12. |
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| 作者姓名： | 曹国良 李国民 常万顺 陈珊 陈学群 |
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| 作者单位： | 海军工程大学理学院化学与材料系,武汉,430033 |
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| 摘 要： | 选择了2种低碳结构钢，在除氧及不除氧的3％NaCl溶液中进行了不同pH值条件下的极化试验，测定了钢的点蚀电位，并利用eaq-探针分析了腐蚀形貌。结果表明，随溶液的pH值的升高，钢更容易钝化，点蚀诱发敏感性降低。在相同的pH值条件下，溶液中的溶解氧可促进钢的钝化，导致点蚀电位变正。溶解氧降低了pH值对点蚀电位测定的敏感程度，使钢的临界钝化pH值降低。
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| 关 键 词： | 碳钢 点蚀电位 pH |
Effects of pH Value and Dissolved Oxygen on Pit Initiation Behavior of Mild Steel |
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| CAO Guo-liang,LI Guo-ming,CHANG Wan-shun,CHEN Shan,CHEN Xue-qun.Effects of pH Value and Dissolved Oxygen on Pit Initiation Behavior of Mild Steel[J].Equipment Environmental Engineering,2009,6(6):9-12. |
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| Authors: | CAO Guo-liang LI Guo-ming CHANG Wan-shun CHEN Shan CHEN Xue-qun |
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| Institution: | (Naval University of Engineering, Wuhan 430033, China) |
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| Abstract: | The pitting potential of mild steel was determined by means of polarization experiments in 3% NaCl solution under deaerated and non-deaerated condition with different the pH value. Pitting corrosion characteristics were analyzed with electron probe micro-analyzer （EPMA）. The results showed that passivation of the steel become easier and the pitting sensitivity decreases when the pH value of the solution increases; dissolved oxygen can cause pitting potential increase and help to produce protective film; dissolved oxygen can also reduce the sensitivity of pitting potential to pH value and cause the critical passivation pH value decrease. |
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| Keywords: | pH |
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