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首页> 外文期刊>Journal of Applied Electrochemistry >Investigation on inhibition of CrO42- and MoO42- ions on carbon steel pitting corrosion by electrochemical noise analysis
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Investigation on inhibition of CrO42- and MoO42- ions on carbon steel pitting corrosion by electrochemical noise analysis

机译：电化学噪声分析研究CrO42-和MoO42-离子对碳钢点蚀的抑制作用

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摘要

The inhibition effect of chromate (CrO42-) and molybdate (MoO42-) anions on the pitting corrosion of 16Mn carbon steel in 0.1 M NaCl containing bicarbonate solution was studied based on electrochemical noise analysis (ENA) and the potentiodynamic polarization method. The experimental results indicated that, once the pits occur on the surface of the carbon steel after 4-6 h of immersion, increasing the concentration of CrO42- and MoO42- ions accelerate the repassivation process, and attenuate the duration and the nucleation rate of metastable pits. Further analysis demonstrated that noise resistance R-n might not be suitable for the evaluation of the inhibition efficiency of CrO42- and MoO42- anions on pitting corrosion in the present system. However, the transient charge q(pit), which is an integral of all current transients during a certain period, can characterize the inhibition performance on pitting corrosion. A new definition of inhibition efficiency based on q(pit) is given. [References: 15]
机译：基于电化学噪声分析（ENA）和电位动力学极化方法，研究了铬酸根（CrO42-）和钼酸根（MoO42-）对16Mn碳钢在0.1M NaCl碳酸氢盐溶液中点蚀的抑制作用。实验结果表明，碳钢在浸入4-6h后一旦出现凹坑，增加CrO42-和MoO42-离子的浓度会加速再钝化过程，并减弱亚稳的持续时间和成核速率。坑。进一步的分析表明，在本系统中，抗噪声性R-n可能不适用于评估CrO42-和MoO42-阴离子对点蚀的抑制效率。但是，瞬态电荷q（pit）是某个时期内所有电流瞬态的积分，可以表征点蚀的抑制性能。给出了基于q（pit）的抑制效率的新定义。 [参考：15]

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