pH值对X100管线钢在CO32-/HCO3-溶液中的电化学与应力腐蚀行为的影响

doi:10.11902/1005.4537.2021.244

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 779-784 DOI: 10.11902/1005.4537.2021.244

研究报告

本期目录 | 过刊浏览

pH值对X100管线钢在CO₃^2-/HCO₃^-溶液中的电化学与应力腐蚀行为的影响

李柯萱¹, 宋龙飞²^,³(

), 李晓荣⁴

^1.宁波工程学院材料与化学工程学院宁波 315211
^2.广州大学化学化工学院广州 510006
^3.北京科技大学新材料技术研究院北京 100083
^4.天津大港油田集团工程建设有限责任公司天津 300272

Effect of pH on Electrochemical Corrosion and Stress Corrosion Behavior of X100 Pipeline Steel in CO₃^2-/HCO₃^- Solutions

LI Kexuan¹, SONG Longfei²^,³(

), LI Xiaorong⁴

^1.School of Materials and Chemical Engineering, Ningbo University of Engineering, Ningbo 315211, China
^2.School of Chemistry and Chemical Engineering,Guangzhou University, Guangzhou 510006, China
^3.Institute for Advanced Material and Technology, University of Science and Technology Beijing, Beijing 100083, China
^4.Dagang Oilfield, Tianjin Construction Group Company Limited, Tianjin 300272, China

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摘要:

通过动电位极化曲线、电化学阻抗图谱、Mott-Schottky曲线和慢应变速率拉伸实验研究了pH值对X100管线钢在CO₃^2-/HCO₃^-溶液中的电化学与应力腐蚀行为的影响。结果表明,随pH值升高,X100管线钢表面膜厚度与致密性提高,点蚀电位提高；高pH-SCC敏感性降低。

关键词 ： X100管线钢, 应力腐蚀, pH值, 表面

Abstract：

The effect of pH value on the electrochemical corrosion and stress corrosion of X100 pipeline steel in CO₃^2-/HCO₃^- containing solutions were studied by means of measurements of potentiodynamic polarization curve, AC impedance spectrum and Mott-Schottky curve, as well as slow strain rate tensile test. The results showed that with the increasing pH value, the thickness and compactness of the formed passive film and the pitting potential of X100 pipeline steel increase, while its SCC sensitivity reduces to certain extent.

Key words： X100 pipeline steel stress corrosion pH value surface

收稿日期: 2021-09-18

ZTFLH:

TG174

基金资助:宁波工程学院科研启动基金

通讯作者: 宋龙飞 E-mail: songlongfei@gzhu.edu.cn

Corresponding author: SONG Longfei E-mail: songlongfei@gzhu.edu.cn

作者简介: 李柯萱,女,1987年生,讲师,博士生

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引用本文:

李柯萱, 宋龙飞, 李晓荣. pH值对X100管线钢在CO₃^2-/HCO₃^-溶液中的电化学与应力腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2022, 42(5): 779-784.
Kexuan LI, Longfei SONG, Xiaorong LI. Effect of pH on Electrochemical Corrosion and Stress Corrosion Behavior of X100 Pipeline Steel in CO₃^2-/HCO₃^- Solutions. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 779-784.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.244 或 https://www.jcscp.org/CN/Y2022/V42/I5/779

表1 NaHCO3/Na2CO3缓冲液的配比与pH值

图1 慢应变速率拉伸实验试样尺寸

图2 X100管线钢在不同pH的CO32-/HCO3-溶液中的快慢速扫描动电位极化曲线

图3 X100管线钢快慢速扫描极化曲线的自腐蚀电位

图4 X100管线钢在不同pH的CO32-/HCO3-溶液中的电化学测试曲线

图5 X100管线钢在不同pH的溶液中的Mott-Schottky曲线

图6 pH对X100管线钢在CO32-/HCO3-溶液中表面膜层密度和厚度的影响

图7 X100管线钢在不同pH的CO32-/HCO3-溶液中的应力-应变曲线及应力腐蚀敏感性

图8 X100管线钢慢应变速率拉伸测试后的断口形貌

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