| 酸性土壤环境中剥离涂层下X80钢应力腐蚀行为及机理 |
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| 引用本文： | 李宗书,刘智勇,杜翠薇,李彩玉.酸性土壤环境中剥离涂层下X80钢应力腐蚀行为及机理[J].表面技术,2016,45(7):1-7. |
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| 作者姓名： | 李宗书 刘智勇 杜翠薇 李彩玉 |
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| 作者单位： | 北京科技大学 腐蚀与防护中心,北京,100083;北京科技大学 腐蚀与防护中心,北京,100083;北京科技大学 腐蚀与防护中心,北京,100083;北京科技大学 腐蚀与防护中心,北京,100083 |
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| 基金项目： | 国家重点基础研究发展计划（973 计划，2014CB643300）；国家自然科学基金项目（51171025，51371036， 51131001， 51471034）；北京市青年英才计划资助 |
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| 摘 要： | 目的研究酸性土壤环境中剥离涂层下X80管线钢应力腐蚀行为及机理。方法采用电化学极化曲线测试、慢应变速率拉伸试验和腐蚀形貌扫描电子显微镜观察,对服役于鹰潭土壤环境的X80管线钢在剥离涂层下滞留液中的应力腐蚀行为及机理进行了分析研究。结果 X80管线钢在剥离涂层下的滞留液中具有一定的SCC敏感性,应力腐蚀开裂类型属于TGSCC,敏感性较大位置为近漏点处、剥离区中下部及剥离区底部,且近漏点处滞留液体系中X80钢的SCC机理受阳极溶解(AD)机制控制,剥离区底部滞留液中SCC机理受阳极溶解+氢脆(AD+HE)的混合机制控制。结论服役于酸性土壤中的X80管线钢在外防腐涂层破损后,除开放破损处将发生腐蚀外,剥离涂层下的管线钢还会存在一定的应力腐蚀敏感性。
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| 关 键 词： | X80管线钢 酸性土壤 应力腐蚀(SCC) 剥离涂层 滞留液 |
| 收稿时间： | 2016/3/21 0:00:00 |
| 修稿时间： | 2016/7/20 0:00:00 |
Stress Corrosion Cracking Behavior and Mechanism of X80 Pipeline Steel in Simulated Trapped Solution of Yingtan-soil under Disbonded Coating |
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| LI Zong-shu,LIU Zhi-yong,DU Cui-wei and LI Cai-yu.Stress Corrosion Cracking Behavior and Mechanism of X80 Pipeline Steel in Simulated Trapped Solution of Yingtan-soil under Disbonded Coating[J].Surface Technology,2016,45(7):1-7. |
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| Authors: | LI Zong-shu LIU Zhi-yong DU Cui-wei and LI Cai-yu |
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| Affiliation: | Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China,Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China,Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China and Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Objective To study the stress corrosion cracking (SCC) behavior and mechanism of X80 pipeline steel in the simulated trapped solution of Yingtan-soil in China under disbonded coating. Methods The potentiodynamic polarization, slow strain rate test (SSRT) and corrosion morphologies examination by scanning electronic microscopy (SEM) were applied for the research. Results X80 pipeline steel had high SCC sensitivity in simulated trapped solution, and the corrosion type was TGSCC. The SCC susceptibility of X80 pipeline steel in trapped solution of near-breakage region, lower parts and bottom was higher than others. The mechanism in trapped solution of near-breakage region was controlled by anodic dissolution (AD). And in trapped solution of bottom, the mechanism of X80 pipeline steel was mix-controlled by anodic dissolution and hydrogen embrittlement (AD+HE). Conclusion When a coating of X80 pipeline steel used in acid soil environment was disbonded, in addition to corrosion at the open breakage, stress corrosion cracking also occurred under the disbonded coating. |
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| Keywords: | X80 pipeline steel acid soil stress corrosion cracking (SCC) disbonded coating trapped solution |
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