破损涂层下管线钢的交流电干扰腐蚀行为

doi:10.11902/1005.4537.2017.118

中国腐蚀与防护学报

2017, Vol. 37

Issue (4): 341-346 DOI: 10.11902/1005.4537.2017.118

研究报告

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破损涂层下管线钢的交流电干扰腐蚀行为

王晓霖¹, 闫茂成²(

), 舒韵², 孙成², 柯伟²

1 中国石油化工股份有限公司抚顺石油化工研究院抚顺 113001
2 中国科学院金属研究所材料环境腐蚀研究中心国家金属腐蚀控制工程技术研究中心沈阳 110016

AC Interference Corrosion of Pipeline Steel Beneath Delaminated Coating with Holiday

Xiaolin WANG¹, Maocheng YAN²(

), Yun SHU², Cheng SUN², Wei KE²

1 Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun 113001, China
2 National Engineering Research Center for Corrosion Control, Environment Corrosion Center, Instituteof Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

构建了带破损点的剥离涂层管道腐蚀模拟实验装置,采用微电极技术研究交流干扰X80管线钢破损/剥离涂层下局部腐蚀行为及规律。结果表明：交流电干扰使涂层破损管线钢电位负向偏移;随交流电密度增大,X80钢的阳极溶解速率增大,腐蚀形态由均匀腐蚀逐渐向局部腐蚀转变;破损点处管线钢发生严重腐蚀,剥离区腐蚀程度稍有减缓;但施加100 A/m²交流电时,剥离区深处X80钢表面仍出现了较严重的点蚀坑。从交流干扰的整流效应、阳极反应不可逆性及交流电对钢/环境界面双电层结构影响等角度讨论了交流电干扰对涂层破损下管线钢腐蚀行为的影响。

关键词 ：管道钢, 杂散电流, 防腐层, 阴极保护, 电干扰

Abstract：

AC interference corrosion of X80 pipeline steel beneath a delaminated coating with an artificial damage is investigated via a simulated crevice cell by means of microelectrode technique in artificial neutral soil solution NS4. The results show that the applied AC interference may induce the negative shift of the free corrosion potential of X80 steel. With the increase of AC current density, the anodic dissolution rate of X80 steel increases, while the corrosion pattern changes from uniform corrosion to local corrosion. The corrosion of pipeline steel just on the damaged spot is the most serious, however, the corrosion attack of the steel beneath the delaminated coating around the damaged spot is slightly alleviated. When the AC interference current density increases up to 100 A/m², serious pitting corrosion appears on X80 steel surface, where locates even far from the damaged spot beneath the delaminated coating. The influence of AC interference on the corrosion behavior of pipeline steel beneath the damaged coating was discussed from aspects of the rectification effect of the AC interference, the irreversibility of anode reaction and the effect of AC on the double layer structure at the interface steel/solution.

Key words： pipeline steel AC interference coating cathodic protection electrical interference

收稿日期: 2017-07-20

ZTFLH:

TG172.9

基金资助:资助项目国家自然科学基金重点项目 (51471176) 和国家材料环境腐蚀平台 (2005DKA10400)

作者简介:

作者简介王晓霖,男,1977年生,博士,高级工程师

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引用本文:

王晓霖, 闫茂成, 舒韵, 孙成, 柯伟. 破损涂层下管线钢的交流电干扰腐蚀行为[J]. 中国腐蚀与防护学报, 2017, 37(4): 341-346.
Xiaolin WANG, Maocheng YAN, Yun SHU, Cheng SUN, Wei KE. AC Interference Corrosion of Pipeline Steel Beneath Delaminated Coating with Holiday. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 341-346.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.118 或 https://www.jcscp.org/CN/Y2017/V37/I4/341

图1 交流干扰管线钢剥离涂层下腐蚀模拟实验装置示意图

图2 涂层破损管线钢交流干扰施加及测试示意图

图3 不同电流密度交流干扰下X80管线钢的腐蚀电位随时间的变化规律

图4 交流干扰电流密度分别为20和100 A/m2时剥离涂层下X80钢局部电位随时间的变化

图5 交流干扰电流密度分别为20和100 A/m2时破损防腐层下X80钢局部电位分布

图6 交流电流密度为20 A/m2干扰下涂层破损点及剥离区不同位置X80钢试样实验72 h后表面腐蚀产物形貌

图7 不同交流电流密度干扰下涂层破损点及剥离区不同位置X80钢试样腐蚀72 h后的表面腐蚀产物和腐蚀形貌

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