李琼,刘智勇,杜翠薇,李晓刚,刘然克.不同外加电位下 X80 管线钢在近中性 pH 溶液环境中的裂纹扩展行为研究[J].表面技术,2015,44(3):31-35,51.
LI Qiong,LIU Zhi-yong,DU Cui-wei,LI Xiao-gang,LIU Ran-ke.Crack Propagation Behaviour of X80 Pipeline Steel in Near-neutral pH Solution under Different Applied Potential[J].Surface Technology,2015,44(3):31-35,51 |
| 不同外加电位下 X80 管线钢在近中性 pH 溶液环境中的裂纹扩展行为研究 |
| Crack Propagation Behaviour of X80 Pipeline Steel in Near-neutral pH Solution under Different Applied Potential |
| 投稿时间：2014-11-12 修订日期：2015-03-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.03.005 |
| 中文关键词: X80 管线钢 外加电位 近中性 pH 裂纹扩展 |
| 英文关键词:X80 pipeline steel applied potential near-neutral pH crack propagation behavior |
| 基金项目:国家高技术研究发展计划(863 计划,2012AA040105);国家自然科学基金(51471034);北京市青年英才计划资助 |
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| Author | Institution |
| LI Qiong | Corrosion and Protection Center, University of Science and Technology Beijing, Beijng100083, China |
| LIU Zhi-yong | Corrosion and Protection Center, University of Science and Technology Beijing, Beijng100083, China |
| DU Cui-wei | Corrosion and Protection Center, University of Science and Technology Beijing, Beijng100083, China |
| LI Xiao-gang | Corrosion and Protection Center, University of Science and Technology Beijing, Beijng100083, China |
| LIU Ran-ke | Corrosion and Protection Center, University of Science and Technology Beijing, Beijng100083, China |
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| 中文摘要: |
| 目的 研究不同外加电位下,X80 管线钢在近中性 pH 溶液环境中的裂纹扩展行为。 方法 对X80 管线钢紧凑拉伸试样进行近中性 pH 溶液环境中的循环加载试验,利用拍摄装置记录不同循环次数下的裂纹长度,并利用扫描电镜(SEM)观察裂纹扩展面上的微观形貌。 研究不同外加电位下,X80 钢在近中性 pH 溶液环境中的裂纹扩展速率,分析其裂纹扩展规律。 结果 在开路条件下,循环加载 755 次时,裂纹扩展 4. 6 mm 后失稳断裂;在外加电位为-775 mV(vs. SCE)的条件下,循环加载 671 次时,裂纹扩展 3. 677 mm 后失稳断裂;在外加电位为-1125 mV(vs. SCE) 的条件下,循环加载 625 次时,裂纹扩展3. 882 mm 后失稳断裂。 结论 在开路电位和弱阴极电位下,裂纹扩展受到阳极溶解机制和氢脆机制的混合控制,以阳极溶解机制为主,裂纹扩展速率均较低;随着外加电位降低,裂纹扩展机制逐渐过渡为主要受氢致开裂作用控制,裂纹扩展速率显著增加。 |
| 英文摘要: |
| Objective To study the crack propagation behavior of X80 pipeline steel in near-neutral pH solution under different applied potential. Methods The cyclic loading experiment of X80 pipeline steel compact tension (CT) specimen under different applied potential was conducted and the crack length was recorded by a magnifying glass during the experiment. After the cyclic loading experiment, the micro-morphology of crack propagation surface was observed by Scanning electron microscope (SEM). The crack propagation rate of X80 pipeline steel in near-neutral pH solution under different applied potential and the crack propagation rule was analyzed. Results The brittle unstable fracture of CT specimen under open circuit condition occurred after 755 cycles and the crack propagation length was 4. 6 mm. The brittle unstable fracture of CT specimen under an applied potential of -775 mV (vs. SCE) occurred after 671 cycles and the crack propagation length was 3. 677 mm. The brittle unstable fracture of CT specimen under an applied potential of -1125 mV ( vs. SCE) occurred after 625 cycles and the crack propagation length was 3. 882 mm. Conclusion The crack propagation of X80 pipeline steel in near-neutral pH solution under open circuit condition and weak cathode potential was mix-controlled by anodic dissolution mechanism and hydrogen embrittlement mechanism, dominated by the anodic dissolution mechanism, and the crack propagation rate was low. With the decrease of the applied potential, the crack propogation mechanism was gradually dominated by the hydrogen embrittlement mechanism, and the crack propagation rate was obviously increased. |
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