Cl~-对天然气管道内涂层破损处局部腐蚀的影响
发布时间：2018-07-13 11:31
【摘要】：为了进一步了解天然气管道内涂层破损处在含Cl~-电解质溶液中的破损机理,以X80管线钢为基材,利用EIS(电化学阻抗谱法)和SKP(扫描开尔文探针测试法)等电化学检测技术,通过获取内涂层破损处的腐蚀电化学参数的特性,研究了Cl~-浓度对特定缺陷尺寸内涂层破损处局部腐蚀的影响,并探讨其腐蚀机理。EIS谱结果表明,不同Cl~-浓度下的腐蚀过程经历了大致相同的规律,即随着浸泡时间延长腐蚀电阻出现先减小后增大的趋势;SKP测试表明,破损处周边的涂层/金属界面存在较大的电位差,在界面最易发生腐蚀,并随着浸泡时间延长,推动着腐蚀向涂层内部渗透,进而引发涂层不断剥离。
[Abstract]:In order to further understand the damage mechanism of inner coating in Cl-electrolyte solution, X80 pipeline steel was used as substrate, and electrochemical detection techniques such as EIS (Electrochemical Impedance Spectroscopy) and SKP (scanning Kelvin probe Test) were used. By obtaining the corrosion electrochemical parameters of the inner coating, the effect of Cl-concentration on the local corrosion of the inner coating with specific defect size was studied, and the corrosion mechanism of the inner coating was discussed. The corrosion process at different Cl-concentration experienced approximately the same rule, that is, with the prolongation of immersion time, the corrosion resistance decreased first and then increased. The results of SKP test showed that there was a large potential difference between the coating and metal interface around the damaged area. Corrosion occurs most easily at the interface, and with the prolongation of soaking time, corrosion penetrates into the coating, which leads to the continuous exfoliation of the coating.
【作者单位】： 西南石油大学石油与天然气工程学院;
【分类号】：TE988.2
本文编号：2119211
[Abstract]:In order to further understand the damage mechanism of inner coating in Cl-electrolyte solution, X80 pipeline steel was used as substrate, and electrochemical detection techniques such as EIS (Electrochemical Impedance Spectroscopy) and SKP (scanning Kelvin probe Test) were used. By obtaining the corrosion electrochemical parameters of the inner coating, the effect of Cl-concentration on the local corrosion of the inner coating with specific defect size was studied, and the corrosion mechanism of the inner coating was discussed. The corrosion process at different Cl-concentration experienced approximately the same rule, that is, with the prolongation of immersion time, the corrosion resistance decreased first and then increased. The results of SKP test showed that there was a large potential difference between the coating and metal interface around the damaged area. Corrosion occurs most easily at the interface, and with the prolongation of soaking time, corrosion penetrates into the coating, which leads to the continuous exfoliation of the coating.
【作者单位】： 西南石油大学石油与天然气工程学院;
【分类号】：TE988.2
【相似文献】
相关期刊论文 前10条
1 葛国防;管道内涂层经济可行性分析[J];油气储运;2003年02期
2 崔涛,宋旭强,钱成文,刘广文;管道内涂层涂敷技术[J];油气储运;2000年12期
3 吴勇,王文焱,林伟杰,常兴,刘晓东;一种管道内涂层工艺在修复油田老区管网中的应用[J];腐蚀与防护;2002年05期
4 臧国军;崔斌;;油气集输管道内涂层金属腐蚀失效机理研究[J];石油化工设计;2005年04期
5 于树青;刘广文;钱成文;;《管道科学技术论文选集》文摘(二十五) 天然气管道内涂层减阻技术经济分析方法和判据[J];油气储运;2006年10期
6 周入刚;吴清海;刘金祯;魏连清;褚洪金;叶勇华;;石油管道内涂层离心喷涂工艺技术探讨[J];石油机械;2009年10期
7 马卫锋;罗金恒;陈志昕;蔡克;张华;赵新伟;;国外天然气管道内涂层评价技术研究进展[J];石油工程建设;2012年03期
8 马卫锋;罗金恒;蔡克;陈志昕;李丽锋;赵新伟;;在役天然气管道内涂层性能试验研究[J];管道技术与设备;2012年06期
9 陈文锋;;钢管道内涂层风送涂敷器——实用新型专利简介[J];石油工程建设;1993年02期
10 张红兵,刘志林,郑云萍,崔斌;管道内涂层涂敷技术及其应用[J];腐蚀科学与防护技术;2003年02期
相关硕士学位论文 前1条
1 李肖蔚;涂层下承载炼化设备及管道的局部腐蚀演变规律[D];中国石油大学(华东);2014年
，本文编号：2119211
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2119211.html
