阵列电极(WBE)联合线性极化技术(LP)研究海水-大气界面区碳钢的腐蚀行为
Evaluation of Sea-air Interface Area Corrosion for Carbon Steel by WBE Technique and LP Technique
摘 要
金属在海水-大气界面的水线腐蚀严重, 腐蚀机理复杂, 具有重要的科学研究价值。通过阵列电极(WBE)测试技术捕获部分浸泡于海水中的碳钢阵列电极的阴阳极分布规律; 通过线性极化技术(LP)测试获得垂直于海水-大气界面的碳钢阵列电极列的腐蚀电流与腐蚀电位; 通过电化学阻抗谱(EIS)与腐蚀形貌观察法相结合的方法探讨了垂直于海水-大气界面的碳钢阵列电极列的腐蚀机理差异。结果表明: 垂直于海水-大气界面的碳钢分别在水线区域和近海水-大气界面的海水区域存在两个腐蚀峰, 腐蚀峰的腐蚀电流是其他区域的3~10倍; 大气中的腐蚀电位高于海水中, 处于海水中的碳钢腐蚀电位随浸泡时间逐渐升高而处于大气中的腐蚀电位逐渐下降; 海水中碳钢的腐蚀产物疏松、附着力差, 在大气中则腐蚀产物致密、附着力强; 海水-大气界面区碳钢的腐蚀是由电位差、溶解氧浓度、腐蚀产物等多因素控制的。
腐蚀
阵列电极(WBE)
溶解氧浓度
sea-air interface
corrosion
wire beam electrode(WBE)
local area
dissolved oxygen concentration
Abstract
The corrosion of carbon steel in the sea-air interface area was studied by means of wire beam electrode (WBE), linear polarization (LP) technique, electrochemical impedance spectroscopy (EIS) and corrosion morphology. The WBE of carbon steel in the water-line area and under the waterline corroded seriously. The Icorr of the WBE in the two areas was the three-to ten-fold of that in the others areas. The Ecorr of the WBE in the air area was higher than that of the WBE in seawater area in the experimental period. The Ecorr of the WBE in the air area gradually lowered and the Ecorr of the WBE in the seawater area gradually increased. The corrosion product of WBE in the seawater was fluffy and had low adhesion. The corrosion product of WBE in the air was compact and had strong adhesion. The corrosion of carbon steel in the sea-air interface area is controlled by the potential difference, dissolved oxygen concentration and corrosion product.
中图分类号 TG174 DOI 10.11973/fsyfh-201511002
所属栏目 试验研究
基金项目 国家重点基础研究发展计划项目(2014CB643300); 国家材料环境腐蚀平台项目
收稿日期 2015/5/31
修改稿日期
网络出版日期
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备注李晓刚, 教授, 博士, 从事材料腐蚀与防护的研究,
引用该论文: HU Jie-zhen,CHENG Xue-qun,LI Xiao-gang,DENG Pei-chang,WANG Gui. Evaluation of Sea-air Interface Area Corrosion for Carbon Steel by WBE Technique and LP Technique[J]. Corrosion & Protection, 2015, 36(11): 1014
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参考文献
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