| 阴极极化条件下X70钢的缝隙腐蚀行为 |
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| 引用本文： | 陈旭,李晓刚,杜翠薇,梁平.阴极极化条件下X70钢的缝隙腐蚀行为[J].金属学报,2008,44(12). |
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| 作者姓名： | 陈旭 李晓刚 杜翠薇 梁平 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家科技部基础条件平台建设项目2005DKA10400~~ |
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| 摘 要： | 采用矩形缝隙装置，测量了模拟剥离涂层下不同位置X70钢的电位、溶液pH值及氧含量随时间的变化曲线．研究了外加阴极极化电位、涂层破损尺寸和缝隙厚度对X70钢在Nu2SO4溶液中的缝隙腐蚀行为的影响．结果表明，缝隙内氧气迅速耗尽并使溶液pH值升高，氧耗尽与外加阴极极化电位无关．随着缝口阴极极化程度加大，缝隙内各点电位负移，有效保护距离增加．溶液介质电位（IR）降集中在缝口．极化程度过高会导致氢气的析出．减小缝隙厚度和破损点尺寸使缝隙内极化程度降低．
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| 关 键 词： | X70管线钢 阴极保护 缝隙腐蚀 电位分布 氧含量 pH值 |
CREVICE CORROSION BEHAVIOR OF THE STEEL X70 UNDER CATHODIC POLARIZATION |
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| CHEN Xu,LI Xiaogang,DU Cuiwei,LIANG Ping.CREVICE CORROSION BEHAVIOR OF THE STEEL X70 UNDER CATHODIC POLARIZATION[J].Acta Metallurgica Sinica,2008,44(12). |
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| Authors: | CHEN Xu LI Xiaogang DU Cuiwei LIANG Ping |
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| Abstract: | A rectangle crevice assembly was used to measure the change of potential of steel X70,pH value and oxygen content in the crevice with time under the simulated disbonded coating. The effects of cathodic polarization potential,crevice thickness,holiday size on the crevice corrosion behavior of steel XT0 in Na_2SO_4 solution were investigated.It is found that the dissolved oxygen was depleted within the crevice and thus shifted the solution to a more alkaline state.The oxygen depletion has no relation with the... |
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| Keywords: | pipeline steel X70 cathodic protection crevice corrosion potential distribution oxygen content pH value |
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