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Transition criterion of metastable pitting towards stability for carbon steel in chloride solutions

机译：碳钢在氯化物溶液中亚稳点蚀向稳定性转变的准则

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摘要

The current transients during metastable pitting of A516–70 carbon steel in bicarbonate–chloride solutions were monitored and statistically analysed. The transition criterion from metastable to stable pits was determined. Two experimental approaches were used for this purpose: potentiostatic control and galvanic coupling. It was shown that the initiation of metastable pits was indicated by typical current transients: a quick current rise followed by a slow recovery. A pit stabilisation criterion, that the ratio of peak pit current to pit radius must exceed 2 × 10-2 A cm-1 during stable pit growth, was established from the potentiostatic measurements. This criterion reflected the critical concentration difference of cation between bulk solution and pit anolyte. Two other pit stabilisation factors, statistical parameters in the galvanically coupled experiments, qualitatively provided an indication of the change in pitting activity. However, these factors had shortcomings due to the errors existing in the measurement system.
机译：对A516–70碳钢在碳酸氢盐－氯化物溶液中的亚稳点蚀过程中的电流瞬态进行了监测和统计分析。确定了从亚稳态到稳定凹坑的过渡标准。为此，使用了两种实验方法：恒电位控制和电流耦合。结果表明，典型的电流瞬变指示了亚稳态坑的开始：电流快速上升，然后缓慢恢复。从恒电位出发，建立了一个稳定坑标准，即在稳定的坑生长过程中，最大坑电流与坑半径之比必须超过2×10 -2 A cm -1 测量。该标准反映了本体溶液和凹坑阳极电解液之间阳离子的临界浓度差。电偶耦合实验中的其他两个坑稳定因子（统计参数）定性地提供了坑蚀活性变化的指示。然而，由于测量系统中存在的误差，这些因素具有缺点。

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    《British Corrosion Journal》 |1999年第4期|280-284|共5页
  • 作者

    Cheng Y.F.; Wilmott M.; Luo J.L.;

  • 作者单位

    The Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada;

    NOVA Research & Technology Corporation, 2928 16th St NE, Calgary, Alberta, Canada;

    The Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada;

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