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首页> 外文期刊>Corrosion Engineering, Science and Technology >Pitting corrosion behaviour of 316L stainless steel in chloride solution with acetic acid and CO_2
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Pitting corrosion behaviour of 316L stainless steel in chloride solution with acetic acid and CO_2

机译：316L不锈钢在乙酸和CO_2的氯化物溶液中的点蚀行为

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摘要

Electrochemical impedance spectroscopy and potentiodynamic polarisation measurements were used to verify the effects of temperature and acetic acid (HAc) on the anodic and cathodic reactions in CO_2 corrosion of 316L stainless steel in 3.5% NaCI solution. The tests were carried at 30, 60 and 90℃. The initiation concentration of HAc was varied between 0 and 3000 ppm. After the potentiodynamic polarisation measurements, the surface morphologies for every condition were detected by using scanning electron microscopy. In the present work, the fitting parameters of polarisation curves, such as the corrosion potential E_(corr), the corrosion current density I_(corr) and Tafel shopes (b_a and b_c), were mainly discussed. In addition, the equivalent circuit was used to fit each Nyquist plot in order to obtain the important parameters. In the last section, the probable pitting corrosion mechanisms of pit initiation and growth were also analysed and validated. The results indicated that temperature and the addition of HAc have an important synergistic effect on the pitting corrosion behaviour and mechanism, leading to the increased corrosion rate with temperature and HAc.
机译：使用电化学阻抗谱和电位动力学极化测量来验证温度和乙酸（HAc）对316L不锈钢在3.5％NaCl溶液中的CO_2腐蚀中阳极和阴极反应的影响。测试在30、60和90℃下进行。 HAc的起始浓度在0至3000 ppm之间变化。在电位动力学极化测量之后，通过使用扫描电子显微镜检测每种条件的表面形态。在本工作中，主要讨论了极化曲线的拟合参数，如腐蚀电位E_（corr），腐蚀电流密度I_（corr）和塔菲尔车间（b_a和b_c）。此外，等效电路用于拟合每个奈奎斯特曲线，以获得重要参数。在最后一部分中，还分析和验证了可能的蚀坑萌生和生长的腐蚀机理。结果表明，温度和HAc的添加对点蚀行为和机理具有重要的协同作用，导致腐蚀速率随温度和HAc的增加而增加。

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