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金属学报  2016, Vol. 52 Issue (8): 965-972    DOI: 10.11900/0412.1961.2015.00548
  论文 本期目录 | 过刊浏览 |
X80钢在鹰潭土壤模拟溶液中应力腐蚀裂纹扩展行为机理*
刘智勇1,2(),李宗书1,2,湛小琳1,2,皇甫文珠1,2,杜翠薇1,2,李晓刚1,2,3
1 北京科技大学腐蚀与防护中心, 北京 100083。
2 北京科技大学新材料技术研究院腐蚀与防护教育部重点实验室, 北京 100083。
3 中国科学院宁波材料技术与工程研究所, 宁波 315201
GROWTH BEHAVIOR AND MECHANISM OF STRESS CORROSION CRACKS OF X80 PIPELINE STEEL IN SIMULATED YINGTAN SOIL SOLUTION
Zhiyong LIU1,2(),Zongshu LI1,2,Xiaolin ZHAN1,2,Wenzhu HUANGFU1,2,Cuiwei DU1,2,Xiaogang LI1,2,3
1) Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China.
2) Key Laboratory for Corrosion and Protection (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
3) Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
引用本文:

刘智勇,李宗书,湛小琳,皇甫文珠,杜翠薇,李晓刚. X80钢在鹰潭土壤模拟溶液中应力腐蚀裂纹扩展行为机理*[J]. 金属学报, 2016, 52(8): 965-972.
Zhiyong LIU, Zongshu LI, Xiaolin ZHAN, Wenzhu HUANGFU, Cuiwei DU, Xiaogang LI. GROWTH BEHAVIOR AND MECHANISM OF STRESS CORROSION CRACKS OF X80 PIPELINE STEEL IN SIMULATED YINGTAN SOIL SOLUTION[J]. Acta Metall Sin, 2016, 52(8): 965-972.

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摘要: 

采用电化学极化曲线测试、EIS测试、裂纹扩展实验和SEM分析研究了X80管线钢在鹰潭土壤溶液环境下的应力腐蚀开裂(SCC)裂纹扩展行为及机理. 结果表明, X80管线钢在酸性土壤环境中的裂纹扩展速率随着外加电位的降低呈现增加趋势, 相较于开路电位下的裂纹扩展, 在裂纹扩展初期, -850 mV下裂纹扩展速率较大, 而在裂纹快速扩展阶段, 过保护电位-1200 mV下裂纹扩展速率更大; 同时X80管线钢在酸性土壤环境中的SCC裂纹扩展机制也随着施加外加电位的不同而改变, 在外加电位高于-930 mV时为阳极溶解与氢脆的混合机制, 负于-930 mV时则为氢脆机制.

关键词 X80管线钢外加电位应力腐蚀开裂裂纹扩展    
Abstract

Stress corrosion cracking (SCC) in soil environments is one of the major failure and accident causes for oil and gas pipelines, which have induced hundreds of damages all over the world, resulting in serious economic losses and casualties. Previous study showed that acidic soil environments in Southeast of China are highly sensitive to SCC of pipeline steels. However, there is less research on the behavior and mechanism of growth behavior of SCC in this environment up to date. SCC behavior and mechanism of X80 pipeline steel in the simulated solution of Yingtan in China was investigated with electrochemical polarization curves, EIS, slow-rate-loading crack-growth test and SEM. Results showed that the applied polarization potential played an important role in SCC growth behavior and mechanism of X80 pipeline steel in the simulated solution of the acid soil environment. With the decreasing of the applied potential, the crack propagation rate increased constantly. In comparison to the crack propagation at the open circuit potential, the cracks extended faster in the initial stage of crack propagation when the applied potential was -850 mV; nevertheless, in the rapid propagation stage, the rate of the propagation was magnified with the application of -1200 mV potential. In addition, the crack propagation mode varied with applied potentials: it was mixed-controlled by both anodic dissolution (AD) and hydrogen embrittlement (HE) when the applied potential was more positive than -930 mV, and only in control of HE when the potential was less than -930 mV.

Key wordsX80 pipeline steel    applied potential    stress corrosion cracking    crack propagation
收稿日期: 2015-10-27     
基金资助:* 国家重点基础研究发展计划项目2014CB643300, 国家自然科学基金项目51371036, 51131001, 51471034和北京市青年英才计划项资助
图1  裂纹扩展试样示意图
图2  裂纹扩展实验装置示意图
图3  X80钢在模拟溶液中的快速和慢速扫描极化曲线
图4  X80钢在模拟溶液中不同外加电位下的Nyquist图和Bode图
图5  X80钢在模拟溶液中不同外加电位下的Nyquist等效电路
图6  X80钢在模拟溶液中不同外加电位下的应力与时间关系曲线
图7  X80钢在模拟溶液中恒电位极化电流与拉应力曲线对应关系
图8  X80钢在模拟溶液中不同外加电位下裂纹扩展长度与时间关系曲线
图9  X80钢在模拟溶液中不同外加电位下裂纹扩展速率与时间关系曲线
图10  X80钢在模拟溶液中不同外加电位下裂纹形貌的SEM像
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