静水压力对X100钢在NaHCO<sub>3</sub>+NaCl溶液中电化学行为的影响

doi:10.11902/1005.4537.2015.082

中国腐蚀与防护学报

2016, Vol. 36

Issue (3): 219-224 DOI: 10.11902/1005.4537.2015.082

研究报告

本期目录 | 过刊浏览

静水压力对X100钢在NaHCO₃+NaCl溶液中电化学行为的影响

孟向楠,陈旭(

),吴明,赵阳,范裕文

辽宁石油化工大学石油天然气工程学院抚顺 113001

Effect of Hydrostatic Pressure on Electrochemical Behavior of X100 Steel in NaHCO₃+NaCl Solution

Xiangnan MENG,Xu CHEN(

),Ming WU,Yang ZHAO,Yuwen FAN

School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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摘要:

采用动电位极化、电化学阻抗谱和Mott-Schottky等电化学测量方法研究了静水压力对X100管线钢在0.5 mol/L NaHCO₃+0.03 mol/L NaCl溶液中的电化学腐蚀行为的影响。结果表明：随静水压力增加,X100钢表面点蚀坑数量和面积增加;静水压力增加使溶液离子的活性增加,促进Cl^-在钝化膜中的吸附,腐蚀反应的速率加快,腐蚀电流密度增加。静水压力增加使钝化膜组成由低压时的氧化物或氢氧化物转变为高压时的碳酸盐,导致耐蚀性降低,而点蚀形核几率增加。X100管线钢钝化膜具有n型半导体性质,随静水压力的增加,钝化膜内Cl^-的增多使晶格缺陷增多,促进了氧化膜的破裂。

关键词 ： X100钢, 静水压力, 钝化膜, 电化学行为

Abstract：

Effect of hydrostatic pressure on the electrochemical corrosion of X100 pipeline steel in 0.5 mol/L NaHCO₃+0.03 mol/L NaCl solution was investigated by means of methodspotentindynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky. The results show that with the increasing hydrostatic pressure the number and the size of corrosion pits increase,while the activity of ions in the solution also increases, which in turn promotes the adsorpting of Cl^-in the passive film. As a result, the corrosion rate and the corrosion current density are increased. The component of the passive film transforms from oxide or hydroxide formed by low pressures to carbonate by high pressures, which may result in the decrease of corrosion-resistance and increase of probability of pitting corrosion nucleation. The passivation film formed on the X100 steel exhibits characteristics of n-type semiconductor. The increase amount of Cl^- in the passivation film promotes the increase of lattice imperfections and facilitates the cracking of the oxide film.

Key words： X100 steel hydrostatic pressure passivation film electrochemical behavior

收稿日期: 2015-07-26

基金资助:国家自然科学基金项目(51201009)和辽宁省自然科学基金项目 (2013020078) 资助

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引用本文:

孟向楠,陈旭,吴明,赵阳,范裕文. 静水压力对X100钢在NaHCO₃+NaCl溶液中电化学行为的影响[J]. 中国腐蚀与防护学报, 2016, 36(3): 219-224.
Xiangnan MENG, Xu CHEN, Ming WU, Yang ZHAO, Yuwen FAN. Effect of Hydrostatic Pressure on Electrochemical Behavior of X100 Steel in NaHCO₃+NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 219-224.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.082 或 https://www.jcscp.org/CN/Y2016/V36/I3/219

图1 X100管线钢在不同压力下的腐蚀形貌

图2 X100管线钢在不同压力下的极化曲线

图3 X100钢在不同压力下的EIS曲线

图4 EIS曲线等效电路图

表1 不同压力下X100管线钢在0.5 mol/L NaHCO3+0.03 mol/L NaCl溶液中浸泡后的EIS拟合结果

图5 X100钢在不同压力下0.5 mol/L NaHCO3+0.03 mol/L NaCl溶液中浸泡后的M-S曲线

图6 不同压力下X100钢的施主密度与平带电位的关系

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