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| FEATURES OF ECN OF LOCALIZED CORROSION FOR 16Mn STEEL |
| Zehua Dong;Xingpeng Guo;Jiashen Zheng |
| 武汉华中科技大学化学系 |
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Cite this article:
Zehua Dong; Xingpeng Guo; Jiashen Zheng. FEATURES OF ECN OF LOCALIZED CORROSION FOR 16Mn STEEL. J Chin Soc Corr Pro, 2002, 22(5): 290-294 .
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Abstract 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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Received: 05 March 2001
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