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

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.