采用失重法研究了不同电流密度(0～200 A/m2)的交流杂散电流对X80管线钢腐蚀的影响,并且采用扫描电镜(SEM)、X射线衍射仪(XRD)和能谱仪(EDS)观察分析X80管线钢腐蚀后基底的微观形貌以及腐蚀产物的表面形貌、结构组成和物相成分.结果表明,随着交流杂散电流密度的增加,X80钢的腐蚀速率先是缓慢增大,随后快速增大,最后增大趋势减缓,并不会无限制增大.腐蚀产物分为两层,外层是红棕色的Fe2 O3和棕黄色的FeOOH混杂在一起的疏松多孔的结构,内层是黑色的Fe3O4形成的致密结构.低电流密度时,腐蚀形式主要是均匀腐蚀;高电流密度时,腐蚀形式转变为局部腐蚀.
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