HCO<sub>3</sub><sup>-</sup>对X90管线钢应力腐蚀行为的影响

doi:10.11902/1005.4537.2020.166

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 727-731 DOI: 10.11902/1005.4537.2020.166

研究报告

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HCO₃^-对X90管线钢应力腐蚀行为的影响

宫克¹^,², 吴明¹^,²(

), 张胜¹

^1.中国石油大学 (华东) 储运与建筑工程学院青岛 266555
^2.辽宁石油化工大学石油天然气工程学院抚顺 113001

Effect of HCO₃^- on Stress Corrosion Cracking Behavior of X90 Pipeline Steel

GONG Ke¹^,², WU Ming¹^,²(

), ZHANG Sheng¹

^1.College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China
^2.College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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摘要:

针对沈阳模拟土壤中HCO₃^-浓度变化对高强度X90管线钢的应力腐蚀行为进行了系统的研究。结果表明：X90钢的腐蚀速率随着HCO₃^-浓度的增加呈现出先增大后减小的趋势。HCO₃^-对X90管线钢腐蚀速率主要影响因素是HCO₃^-浓度变化影响钝化膜的保护性。当溶液HCO₃^-浓度为7%时，钝化膜的保护性最弱，X90管线钢的电化学腐蚀速率最快。此外，X90钢在沈阳土壤模拟溶液中的应力腐蚀敏感性呈现出先增大后减小的趋势，与电化学腐蚀速率一致，其应力腐蚀开裂机理为阳极溶解机理。

关键词 ： HCO₃^-, X90管线钢, 钝化膜, 沈阳土壤

Abstract：

The effect of the variation of HCO₃^- concentration in an artificial soil solution, which aims to simulate the liquid of the soil nearby a pipeline situated at Shenyang area, on the stress corrosion cracking behavior of high-strength X90 pipeline steel was systematically studied. The results show that the corrosion rate of X90 steel increases first and then decreases with the increase of HCO₃^- concentration. The variation of HCO₃^- concentration on the corrosion rate of X90 pipeline steel may be ascribed to that the protective properties of the formed passive film may alter with the varying HCO₃^- concentration. When the HCO₃^- concentration of the solution is 7%, the protectiveness on of the passive film is the weakest, and the electrochemical corrosion rate of X90 pipeline steel is the fastest.

Key words： HCO₃^- X90 pipeline steel passive film shenyang soil

收稿日期: 2020-09-21

ZTFLH:

TG172

通讯作者: 吴明 E-mail: wuming_0413@sina.com

Corresponding author: WU Ming E-mail: wuming_0413@sina.com

作者简介: 宫克，男，1992年生，博士生

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引用本文:

宫克, 吴明, 张胜. HCO₃^-对X90管线钢应力腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2021, 41(5): 727-731.
Ke GONG, Ming WU, Sheng ZHANG. Effect of HCO₃^- on Stress Corrosion Cracking Behavior of X90 Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 727-731.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.166 或 https://www.jcscp.org/CN/Y2021/V41/I5/727

图1 X90管线钢在不同浓度HCO3-下的极化曲线

图2 X90管线钢HCO3-浓度与腐蚀电位Ecoor的关系曲线

图3 X90管线钢在不同浓度HCO3-的沈阳土壤模拟溶液中的电化学阻抗图

图4 X90管线钢在不同HCO3-浓度的沈阳土壤模拟溶液中电化学阻抗图谱等效电路图

表1 浓度为1%、3%和5%HCO3-的沈阳土壤模拟溶液中X90管线钢的电化学阻抗曲线拟合参数

表2 浓度为7%、9%HCO3-的沈阳土壤模拟溶液中X90管线钢的电化学阻抗曲线拟合参数

图5 X90管线钢在不同浓度HCO3-的沈阳土壤模拟溶液中SSRT曲线

图6 X90管线钢在不同浓度HCO3-的沈阳土壤模拟溶液中SSRT断口形貌

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