缝隙下Q235碳钢的腐蚀电化学行为研究  

Research on Galvanic Corrosion Behavior of Q235 Carbon Steel in Crevice

作　　者：肖成磊 程庆利[2] 刘小辉[2] 金有海[1] 

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580 [2]中国石油化工股份有限公司青岛安全工程研究院,山东青岛266071

出　　处：《石油化工腐蚀与防护》2016年第1期15-19,共5页Corrosion & Protection In Petrochemical Industry

摘　　要：采用丝束电极测试缝隙内腐蚀电流的分布和电化学阻抗,研究在质量分数为3.5%Na Cl溶液中缝隙对Q235碳钢的腐蚀影响。结果表明在初始第1天,缝隙口为阴极区,缝隙内主要为阳极区;随着时间的延长,阴极区向缝隙内扩展,阳极区缩小;当腐蚀进行到第8天,最大阳极电流区收缩至缝隙最内层,阴极区则主要集中在缝隙口附近,腐蚀分布趋向均匀化;同时,电化学阻抗测试表明,腐蚀速率随着时间的延长,先减小后增大。The impact of crevice on the corrosion of Q235 carbon steel in 3.5% NaCI solution are studied, and the crevice corrosion＇ s electric current distribution and electric chemical resistance were tested with wire beam electrode. The results showed that, on the first day of the start, the inlet of crevice was cathode area and crevice was anode area. With the extension of time, the cathode area expanded to crevice area and the anode area was becoming increasingly smaller. On the 8th day after the start, the anode area with maximum electric current concentrated to the deep layer of the crevice, while the anode area concentrated to the area near the crevice inlet. The corrosion tended to be uniform corrosion. The test of electric - chemical resistance showed that the corrosion rate went up first and then went down with time.

关 键 词：丝束电极 缝隙腐蚀 电化学阻抗 Q235碳钢 

分 类 号：TE988[石油与天然气工程—石油机械设备]