交流干扰与阴极保护共同作用对X65管线钢的腐蚀行为研究

doi:10.11902/1005.4537.2022.016

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 179-185 CSTR: 32134.14.1005.4537.2022.016 DOI: 10.11902/1005.4537.2022.016

研究报告

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交流干扰与阴极保护共同作用对X65管线钢的腐蚀行为研究

李长春¹(

), 何仁碧¹, 陈以龙¹, 何仁洋¹, 王政骁²

^1.中国特种设备检测研究院北京 100029
^2.青岛鼎信通讯股份有限公司青岛 266109

Corrosion Behavior of X65 Steel by AC Interference and Cathodic Protection

LI Changchun¹(

), HE Renbi¹, CHEN Yilong¹, HE Renyang¹, WANG Zhengxiao²

^1.China Special Equipment Inspection and Research Institute, Beijing 100029, China
^2.Qingdao Topscomm Communication Co. Ltd., Qingdao 266109, China

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摘要:

基于自行设计搭建杂散电流腐蚀实验装置，结合电化学测试和失重实验对交流杂散电流和阴极保护作用下的管线钢腐蚀行为开展研究。结果表明：随着交流电流密度的增大，管线钢腐蚀电位负向偏移，增加了金属腐蚀的倾向性。交流干扰促进了交流电正半周期内的阳极氧化反应，管线钢腐蚀速率增大。交流频率的增加缩短了交流电正半周期管线钢发生腐蚀的时间，减小了促进金属氧化反应的法拉第电流，管线钢腐蚀速率减小。而在强酸和强碱环境下，管线钢的腐蚀速率均增强。

关键词 ：交流干扰, 阴极保护, X65钢, NS4溶液, pH

Abstract：

The corrosion behavior of pipeline steel under the combined action of the applied alternating stray current and cathodic protection was assessed via a home-made stray current corrosion testing device, mass loss measurement and electrochemical methods. The results show that with the increase of AC current density, the corrosion potential of pipeline steel is negatively shifted and the metal corrosion tendency is enhanced. AC interference promotes the anodic oxidation reaction in the positive half cycle of AC and then increases the corrosion rate of pipeline steel. With the increase of AC frequency, the corrosion process of the pipeline steel is shortened for each cycle of AC, the Faraday current, as promoter for metal oxidation reaction is suppressed, therewith the corrosion rate of pipeline steel is reduced. The corrosion rate of pipeline steel increases in strong acid or alkali environment.

Key words： AC interference cathodic protection X65 steel NS4 solution pH

收稿日期: 2022-01-11 32134.14.1005.4537.2022.016

ZTFLH:

TG174

基金资助:国家重点研发计划(2019YFF0302205)

作者简介: 李长春，男，1986年生，工程师

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引用本文:

李长春, 何仁碧, 陈以龙, 何仁洋, 王政骁. 交流干扰与阴极保护共同作用对X65管线钢的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(1): 179-185.
Changchun LI, Renbi HE, Yilong CHEN, Renyang HE, Zhengxiao WANG. Corrosion Behavior of X65 Steel by AC Interference and Cathodic Protection. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 179-185.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.016 或 https://www.jcscp.org/CN/Y2023/V43/I1/179

图1 交流杂散电流干扰条件下腐蚀的电化学测试示意图

图2 X65管线钢在有/无阴极保护条件下受交流电流干扰时的腐蚀速率

图3 阴极保护 (-0.85 V) 下X65管线钢在不同电流密度的交流电干扰时的腐蚀形貌及SEM形貌

图4 不同电流密度的交流电干扰下X65管线钢的开路电位及极化曲线

图5 X65管线钢腐蚀电位和腐蚀速率随交流电流密度变化曲线

图6 不同频率的交流电干扰下X65管线钢的极化曲线

图7 不同频率的交流电干扰下X65管线钢的腐蚀电位

图8 不同pH溶液中交流电流干扰下X65管线钢的开路电位及极化曲线

图9 不同pH溶液中交流电流干扰下X65管线钢的腐蚀速率

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