带锈铸铁的阴极保护中断后的电位衰减行为  

POTENTIAL ATTENUATION BEHAVIOR OF RUSTY CAST IRON AFTER SUSPENDING CP

作　　者：张艳成[1] 吴荫顺[1] 何积铨[1] 

机构地区：[1]北京科技大学表面科学与腐蚀工程系

出　　处：《腐蚀科学与防护技术》1998年第4期230-233,共4页Corrosion Science and Protection Technology

基　　金：冶金部腐蚀-磨蚀与表面技术开放研究实验室资助

摘　　要：研究了已生成较厚锈层的带锈铸铁在３．５％ＮａＣｌ溶液中阴极保护被中断后的电位衰减规律．结果表明，其电位呈负指数关系衰减．带锈铸铁的阴极保护被中断后电位衰减相当缓慢，能较长时间地维持金属基体处于较负的电位范围．即阴极保护中断后较长时间内，带锈铸铁仍处于被保护的电位状态．Potential attenuation behavior of rusty cast iron with thick rust scale after suspending cathodic protection (CP) in 3.5%NaCl solution has been studied. The results showed that potential attenuated following negative exponential function with time. The potential attenuation of rusty cast iron was very slow so that iron matrix could keep very negative potential for a long time. Consequently, rusty cast iron remained in the cathodically protected state for a long time after suspending CP.

关 键 词：带锈铸铁 阴极保护 中断保护 电位衰减 腐蚀 

分 类 号：TG174.42[金属学及工艺—金属表面处理]