Fatigue Crack Initiation on Low-Carbon Steel Pipes in a Near-Neutral-pH Environment under Potential Control Conditions
Fatigue Crack Initiation on Low-Carbon Steel Pipes in a Near-Neutral-pH Environment under Potential Control Conditions
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DOI：
10.5006/1.3280786
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发表时间：
2002-11
期刊：
影响因子：
1.6
通讯作者：
M. Puiggali;S. Rousserie;M. Touzet
中科院分区：
文献类型：
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作者：
M. Puiggali;S. Rousserie;M. Touzet
摘要地下管线存在外穿晶开裂现象。该现象发生在脱粘涂层区，是由含有溶解二氧化碳（CO2）的稀释碳酸氢盐水溶液存在引起的。观察到的环境辅助开裂通常被解释为阴极保护效率低下的结果。然而，最近对埋地管道表面的局部电化学电位测量显示出重要的波动，偶尔出现过保护情况。这项工作的主要目的是研究钢在开路电位条件下和在大范围的阴极电位下的表面行为，以确定引发开裂的最佳电化学条件。在欠保护、过保护、欠保护和过保护交替阶段进行了低频循环加载试验。在低ph模拟地下水中，X-52管道…
Abstract External transgranular cracking was observed on underground pipelines. The phenomenon took place under disbonded coating zones and was induced by the presence of diluted bicarbonate aqueous solution containing dissolved carbon dioxide (CO2). The observed environmental-assisted cracking is very often interpreted as a result of the inefficiency of the cathodic protection. However, some recent local electrochemical potential measurements on buried pipeline surfaces displayed important fluctuations with occasional overprotection conditions. The main objective of this work was to investigate the steel surface behavior under open-circuit potential conditions and over a wide range of cathodic potentials to identify the optimum electrochemical conditions to initiate cracking. Low-frequency cyclic loading tests were performed under various electrochemical conditions: underprotection, overprotection, and alternating stages of under- and overprotection. In low-pH simulated groundwater, the X-52 pipeline ste...