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首页> 外文期刊>Journal of Materials Engineering and Performance >Pitting Corrosion of 10Ni8CrMoV High-Strength Steel Induced by a Potential Perturbation
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Pitting Corrosion of 10Ni8CrMoV High-Strength Steel Induced by a Potential Perturbation

机译：潜在扰动引起的10ni8crmov高强度钢的蚀腐蚀

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摘要

Pitting corrosion of high-strength steel 10Ni8CrMoV under square wave polarization (SWP) in simulated deep-sea environment is investigated and the possible mechanism is proposed. The results show that potential perturbation generates periodic intensification effect on both anodic and cathodic processes by frequently breaking the electrode equilibrium state. The intensity of periodic intensification effect essentially depends on the concentration gradient of Fe2+ cations at the steel/solution interface which acts as the forced electrochemical oscillator. The concentration gradient and the resulting concentration polarization effect increase periodically with the increase in SWP potential range. The morphology observation of the pitting and electric charge calculation indicate that the periodic intensification effect can promote the initiation and growth of pits by enhancing the anodic dissolution even under cathodic protection, but it is ineffective below the hydrogen evolution potential. The decrease in either upper or lower potential can mitigate anodic dissolution. Through the statistical analysis of pitting size, it is found that the wide potential range tends to activate the metastable pitting formed under hydrostatic pressure, forming densely distributed pitting. Meanwhile, it is more favorable to the formation of fully grown pits with high size dispersion degree when the proportion of electric charge in the anodic process is higher.
机译：调查了仿真深海环境中方波极化（SWP）下的高强度钢10ni8crmov的蚀腐蚀，提出了可能的机制。结果表明，潜在的扰动通过经常破坏电极平衡状态而产生对阳极和阴极工艺的周期性强化效应。周期性强度效应的强度基本上取决于钢/溶液界面处Fe2 +阳离子的浓度梯度，其用作强制电化学振荡器。随着SWP电位范围的增加，浓度梯度和所得浓度偏振效应周期性增加。蚀力和电荷计算的形态学观察表明，即使在阴极保护下，通过增强阳极溶解，可以通过增强阳极溶解，但在氢进化电位下方是无效的。上部或下部电位的降低可以减轻阳极溶解。通过沉积尺寸的统计分析，发现宽电位范围倾向于激活静液压压力下形成的亚稳地点，形成密集的分布点。同时，当阳极过程中的电荷比例较高时，更有利于形成具有高尺寸分散度的完全生长的凹坑。

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