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X65管线钢电化学充氢后在土壤中腐蚀行为

Keywords: X65管线钢,充氢,腐蚀行为,模拟土壤溶液

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Abstract:

针对油气管道长距离输送所产生土壤质地差异大的工况条件,因氢引起的管道腐蚀问题越来越被人们所关注.基于极化曲线法和电化学阻抗谱法研究了充氢的X65管线钢在格尔木、大港站、大庆站、拉萨站4种模拟土壤溶液中的电化学腐蚀行为.试验结果表明:在同一种土壤溶液中,X65管线钢的开路电位随着充氢时间的增加逐渐降低.不同充氢条件下的X65管线钢在格尔木、大港站、大庆站、拉萨站4种模拟土壤溶液中的极化曲线都只表现出活化溶解状态,而未出现活化-钝化转变区,腐蚀电流密度越来越小,腐蚀速率越来越慢.对EIS进行拟合得出电荷转移电阻Rct随充氢时间t变化规律,Rct在4种土壤溶液中大小依次为格尔木<大港站<大庆站<拉萨站,与极化曲线的分析结果一致.

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