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| FEATURES OF AC IMPEDANCE OF PITTING CORRODED ELECTRODES DURING PITS PROPAGATION |
| Wang Jia Cao Chunan and Lin Haichao (Institute of Corrosion and Protection of Metals; Academia Sinica) |
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Abstract Features of AC impedance of passivated mild steel and stainless steel electrodes suffering from pitting corrosion are studied.For the electrodes during pits propagation, the Sluyters diagrams are composed of two capacitive loops.Based on the assumption that the impedance for a pitting corroded electrode is composed by parallel connection of the impedance within pits and the impedance of the passive surface outside of pits, an equivalent circuit to interprete the features of the impedance of pitting corroded electrodes during pits propagation has been proposed.By the IFP technique developed in this laboratory, the parameters in the equivalent circuit can be estimated.Variations of these parameters with the conditions of electrode surface are studied both for real pitting corroded electrodes and composite electrodes simulating pitting corroded surface.The latter are made of Ni-plated iron electrode with predetermined number of holes (φ0.3mm) drilled through the Ni layer.Results are discussed.
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Received: 25 August 1989
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[3] 曹楚南,王佳,林海潮;中国腐蚀与防护学报,9(4) ,261(1989)
[4] Tousek, J.; Theoretical Aspects f the Localized Corrosion of Meyals,Trans.Tech. Publ., LTD, Switzland(1985)
[5] 王佳,施存余,宋诗哲,曹楚南;中国腐蚀与防护学报,9(1) ,11(1989)
[6] Mansfeld, F. and Kendig, M.W.;162nd Meeting, the Electrochem.Soc.,Abstract No. 64, Detroit(1982)} |
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