中性环境中X70钢的交流腐蚀行为  

Alternating Current Corrosion Behaviors of X70 Steel in Neutral Environments

作　　者：杨燕[1] 李自力[1] 文闯[1] 张玉蛟[2] 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,青岛266580 [2]中国石油管道公司,廊坊065000

出　　处：《腐蚀与防护》2013年第4期291-294,297,共5页Corrosion & Protection

基　　金：中央高校基本科研业务费专项资金(11CX06077A);中国石油大学(华东)研究生创新工程项目(CX-1240)

摘　　要：采用失重法研究了不同电流密度(0500A.m-2)下交流电对X70钢腐蚀行为的影响。结果表明,随着交流电流密度的增加,腐蚀速率呈幂函数规律增大。X70钢在不同电解液中的交流腐蚀形态有所不同。在SO42-存在且无其他侵蚀性离子的环境中,交流干扰诱发均匀腐蚀;而在Cl-存在环境时,交流电与Cl-的联合侵蚀作用将诱发点蚀。生成的腐蚀产物具有一定的保护性,且由于交流电的电解作用导致电解液电阻率发生改变,使得体系中加载的交流电流值呈指数衰减函数规律变化。Abstract： Weight loss tests of X70 steel samples were performed in soil-simulating conditions at various AC current densities from 0 to about 500 A ·m^-2. The results showed that the corrosion rate increased as AC current density increased. Corrosion induced by AC current can present different types in different electrolyte environments. The uniform corrosion happened on X70 steel surface due to the influence of alternating current in the environment with SO42 and without other aggressive ions. But when CI- existed, pitting corrosion happened due to the influence of alternating current and CI-. The corrosion product had certain protection. Because the electrolysis role of alternating current changed the electrolyte resistivity, the alternating current value decreased with the soak time, and the declinefeature presents exponential law.

关 键 词：X70钢 中性环境 浸泡试验 交流腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理] TE988[金属学及工艺—金属学]