<正> 一、前言 关于孔蚀的发生机理,迄今已提出了多种模型。随着交流阻抗测试技术的发展,目前已有不少作者将阻抗技术应用于孔蚀及其它局部腐蚀的研究,取得了一些有益的结果。阻抗技术在界面反应及有关界面现象的研究中有很大的优越性;同时它又具有时间平均和面积平均的特性,因而,在应用于局部腐蚀研究时,阻抗分析必须考虑时间因素和面积因素的影响。 曹楚南等研究了钝态电极处于孔蚀诱导期和发展期的阻抗频谱特征,发现钝化膜穿孔前,在sluyters图上高频区出现一个容抗圈的同时,还有低频感抗或电感性实部收缩现象;
Pitting behavior of passive AISI 304 stainless steel in 0.25M Na_2SO_4 aqueous solutions of pH1.0 containing chloride has been investigated using electrochemical impedance spectra(EIS). The characteristics of the measured impedance spectra have been analyzed. The following conclusions have been obtained: (1) The inductance occurring in very low frequency range at pit propagation stage and the impedance characteristics at pit initiation stage can be well interpreted by the adsorption-transitional chloride containing complex model (2) Under the experiental conditions, the adsorption of SO_4~(2-) on the surface of pits is the controlling factor for pit propagation kinetics. (3) The variation of the reciprocal of the overall charge transfer resistance of pitting reflects the variation of the overall pitting current.
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