某海上平台316L不锈钢液控管线泄漏原因
Cause of leakage of 316L stainless steel hydraulic control pipeline on an offshore platform
摘 要
某海上平台316L不锈钢液控管线发生泄漏，采用宏观观察、化学成分分析、金相检验、扫描电镜和能谱分析等方法，并结合不锈钢液控管线的实际工况，分析管线泄漏的原因。结果表明：该不锈钢液控管线发生泄漏是表面受损和环境介质共同作用所致；在管线安装过程中，其与相邻管线或设备之间发生摩擦，管线外表面钝化膜破损，在含卤族元素的海洋大气环境中钝化膜来不及修复，使管线外表面发生腐蚀，最后在Cl-的加速作用下发生点蚀穿孔导致管线泄漏。
腐蚀穿孔
不锈钢
钝化膜
hydraulic control line
corrosion perforation
stainless steel
passivation film
Abstract
The 316L stainless steel hydraulic control pipeline on an offshore platform was leaked. Using macroscopic observation, chemical composition analysis, metallographic inspection, scanning electron microscopy and energy spectrum analysis, and combined with actual working conditions of stainless steel hydraulic control pipeline. The cause of pipeline leakage was analyzed. The results showed that leakage of stainless steel hydraulic control pipeline was caused by the combined effect of surface damage and environmental media. During pipeline installation process, friction occurred between it and adjacent pipelines or equipment, and the passivation film on the outer surface of pipeline was damaged. In the marine atmosphere containing halogen elements, the passivation film was too late to repair, which caused corrosion of outer surface of pipeline. Finally, pitting and perforation occurred under the acceleration of Cl- to cause leakage of pipeline.
中图分类号 TG178 DOI 10.11973/lhjy-wl202201008
所属栏目 质量控制与失效分析
基金项目
收稿日期 2020/9/14
修改稿日期
网络出版日期
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备注杨中娜 (1985-),女,高级工程师,主要从事海上设备设施的失效分析及腐蚀与防护工作,yangzhn@cnooc.com.cn
引用该论文: YANG Zhongna,WANG Jinxia,JIANG Lei,SONG Zhiqiang,LUO Yi,YANG Yang,WANG Haifeng,JIN Lei. Cause of leakage of 316L stainless steel hydraulic control pipeline on an offshore platform[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(1): 28～32
杨中娜,王金霞,姜磊,宋志强,罗懿,杨阳,王海锋,金磊. 某海上平台316L不锈钢液控管线泄漏原因[J]. 理化检验－物理分册, 2022, 58(1): 28～32
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参考文献
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【3】韩小康,覃明,李佳润,等. 不锈钢在海水中的腐蚀行为研究进展[J]. 材料保护,2017,50(9):75-81.
【4】郭跃岭,韩恩厚,王俭秋. 表面状态对核级316LN不锈钢电化学腐蚀行为的影响[J]. 工程科学学报,2016,38(1):87-94.
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【6】MENG F J,WANG J Q,HAN E H,et al. Effects of scratching on corrosion and stress corrosion cracking of Alloy 690TT at 58℃ and 330℃[J]. Corrosion Science,2009,51(11):2761-2769.
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