镁合金与Q235钢在罐底水溶液下的电偶腐蚀行为

doi:10.3969/j.issn.1006-396X.2021.03.012

石油化工高等学校学报 ›› 2021, Vol. 34 ›› Issue (3): 76-83.DOI: 10.3969/j.issn.1006-396X.2021.03.012

镁合金与Q235钢在罐底水溶液下的电偶腐蚀行为

李卓远¹，谢飞¹，吴明¹，孙东旭¹，赵志龙²

1. 辽宁石油化工大学石油天然气工程学院，辽宁抚顺 113001； 2.中国石油抚顺石化公司石油二厂，辽宁抚顺 113001

收稿日期:2021-01-02 修回日期:2021-02-23 出版日期:2021-06-30 发布日期:2021-07-19
通讯作者: 谢飞（1983-），男，博士，副教授，从事腐蚀与防护方面研究；E-mail：xiefei@163.com。
作者简介:李卓远（1994-），男，硕士，从事腐蚀与防护方面研究；E-mail：461311870@QQ.com。
基金资助:
国家自然科学基金资助项目（51604150）；辽宁省“兴辽英才计划”项目资助(XLYC1807260)；辽宁省自然科学基金联合基金计划（2020-HYLH?14）。

Galvanic Corrosion Behavior of Magnesium Alloy and Q235 Steel in Bottom Water Solution

Li Zhuoyuan¹， Xie Fei¹， Wu Ming¹， Sun Dongxu¹， Zhao Zhilong²

1.College of Petroleum and Natural Gas Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China； 2.PetroChina Fushun Petrochemical Company No.2 Refinery，Fushun Liaoning 113001，China

Received:2021-01-02 Revised:2021-02-23 Online:2021-06-30 Published:2021-07-19

摘要/Abstract

摘要： 利用浸泡实验、电化学测试和微观形貌观测研究大榭油库罐底水模拟溶液下镁合金与Q235钢体系的电偶腐蚀行为，对比研究不同Sc/Sa（阴/阳极面积比）对镁合金/Q235钢电偶腐蚀的影响，探明Sc/Sa与腐蚀速率的关系，并拟合成曲线和表达式。结果表明，当电极阴极面积不变时，随着Sc/Sa的增加，镁合金阳极的腐蚀速率大幅度增加，阴极腐蚀速率虽有增长但并不明显。电偶电流图像中，电偶电流随时间变化出现波动和下降趋势，Sc/Sa为1.0、2.0时电偶电流下降明显，但Sc/Sa为0.5时电偶电流无明显下降。通过电偶电流计算腐蚀速率，发现随着Sc/Sa增大，腐蚀程度加重，腐蚀速率随Sc/Sa的增大呈线性增长。

关键词: 牺牲阳极保护, 罐底腐蚀, Q235钢, 镁合金

Abstract: The galvanic corrosion behavior of magnesium alloy and Q235 steel system different Sc/Sa(negative / anode area ratio) in simulated solution of tank bottom water in Daxie oil depot was studied by immersion experiment, electrochemical test and micro morphology observation method. The impact of different Sc/Sa on corrosion rate was found out, which curve and expression were fitted. The results show that, the corrosion rate of magnesium alloy anode increases greatly with the increasing of Sc/Sa, but the increasing of corrosion rate for the negative part is not obvious. Based on the galvanic current image, the galvanic current fluctuates and decreases with time. When Sc/Sa is 1.0 or 2.0, the galvanic current decreases obviously, which does not decrease obviously when Sc/Sa is 0.5. The corrosion rate is calculated by galvanic current. It is demonstrated that the galvanic current, as well as the corrosion degree increases linearly with the increase of Sc/Sa.

Key words: Anodic sacrifice protection, Tank bottom corrosion, Q235 steel, Magnesium alloy

李卓远，谢飞，吴明，孙东旭，赵志龙. 镁合金与Q235钢在罐底水溶液下的电偶腐蚀行为[J]. 石油化工高等学校学报, 2021, 34(3): 76-83.

Li Zhuoyuan， Xie Fei， Wu Ming， Sun Dongxu， Zhao Zhilong. Galvanic Corrosion Behavior of Magnesium Alloy and Q235 Steel in Bottom Water Solution[J]. Journal of Petrochemical Universities, 2021, 34(3): 76-83.

镁合金与Q235钢在罐底水溶液下的电偶腐蚀行为

Galvanic Corrosion Behavior of Magnesium Alloy and Q235 Steel in Bottom Water Solution

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