Effect of CO2 and R-ratio on near-neutral pH stress corrosion cracking initiation under a disbonded coating of pipeline steel
Effect of CO2 and R-ratio on near-neutral pH stress corrosion cracking initiation under a disbonded coating of pipeline steel
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DOI：
10.1016/j.corsci.2011.03.017
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发表时间：
2011-06-01
影响因子：
8.3
通讯作者：
Chen, W.
中科院分区：
文献类型：
--
作者：
Eslami, A.;Kania, R.;Chen, W.
研究了CO_2和循环应力R比(R=最小应力/最大应力)对管线钢脱粘涂层下近中性pH应力腐蚀裂纹萌生机制(S)的影响。研究发现，随着CO2浓度和CP浓度的不同，脱粘涂层下会形成不同pH的局域环境。当施加循环载荷时，根据局部环境的pH不同，涉及不同的SCC启动机制。降低R比对引发机理有不同的影响。(C)2011爱思唯尔有限公司。保留所有权利。
This study investigates the role of CO2 and cyclic stress R-ratio (R = minimum stress/maximum stress) on near-neutral pH SCC initiation mechanism(s) under a disbonded coating of pipeline steel protected by cathodic protection (CP). It was found that depending on CO2 concentration and level of CP, different localized environments with various pH could be formed under the disbonded coating. When cyclic loading was applied, different SCC initiation mechanisms were involved depending on the pH of the localized environments. Reducing the R-ratio had different effects on the initiation mechanisms. (C) 2011 Elsevier Ltd. All rights reserved.