埋地管线剥离覆盖层下阴极保护的有效性

闫茂成 已出版文章查询
闫茂成
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1 王俭秋 已出版文章查询
王俭秋
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1 柯伟 已出版文章查询
柯伟
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1 韩恩厚 已出版文章查询
韩恩厚
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1中国科学院金属研究所,环境腐蚀试验研究中心,沈阳,110016


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由微小缝隙模拟管线剥离覆盖层(涂层)下的局部电化学环境,用微电极技术测量了缝隙内局部电位及pH的分布,研究了缝口阴极保护电位、剥离区几何形状、溶液电导率等因素对剥离区内部局部环境及阴极保护水平的影响.结果表明,剥离区内电位降(电位梯度)主要集中在破损口附近,而剥离区深处接近自然腐蚀状态;剥离区内有效保护距离随缝口保护电位负移而增加,但缝口过保护并不能有效提高剥离区保护效果.阴极保护可使剥离区局部电化学环境pH升高、电导率增大.

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DOI: http://dx.doi.org/10.3969/j.issn.1005-4537.2007.05.001

语种: 中文   

基金国家自然科学基金(50499336)

关键词阴极保护 管道 涂层 缝隙腐蚀 微电极 电位降 (IR降) 应力腐蚀开裂


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