通过测量16Mn钢在01 mol/LCl-+05 mol/L HCO-3 溶液中的电化学噪声，发现在点蚀诱导期，亚稳态蚀点的形核速率λ不到0002 s -1，噪声电流峰平均宽约3～5 s，而噪声电位峰却平均宽达200 s；在点蚀从亚稳态转变 为稳态过程中，λ急剧增加，且电流噪声峰宽度也开始增加，但电位峰宽度却开始减小 .随着局部腐蚀进入稳定发展期，噪声中出现了大尺度的波动，且噪声电位峰与电流峰宽度 基本相等，但λ却有所下降.宏观点蚀的出现导致噪声电阻Rn迅速下降，并在腐 蚀进入稳定发展期后逐渐趋于稳定.
The change of electrochemical noise(ECN)patterns wi th time of 16Mn steel in 0.1 mol/L Cl-+0.5 mol/L NaHCO3 solution was inv es tigated.The experimental result showed,during metastable pit initiation period,t he pitting initiation rate λ was less than 0.002 s-1,and the average life time of current transient coupled in ECN was about 3～5 s.However,the average li fetime of potential transient was 200 s.During the transition from metastable to stable pitting,λ increased rapidly,with an increase of the lifetime of current transient and a decrease of potential transient.Then,during the stable developm ent of pitting corrosion,the lifetime of current and potential transient become almost identical,and a large-scaled fluctuation in ECN as well as a decrease of λ was observed.In addition,during the transition from metastable to stable pitt ing,noise resistance Rn decreased fast,and Rn get stable once the st abilization of pitting corrosion.
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