317L不锈钢在南海海水中的服役风险
Corrosion Risk of 317L Stainless Steel in Coastal Waters of South China Sea
李慧心 1李大朋 1胡丽华 1王毛毛 2张玉楠 3王修云2
作者信息
- 1. 中海油研究总院有限责任公司,北京 100028
- 2. 安科工程技术研究院(北京)有限公司,北京 102209
- 3. 北京科技大学新材料技术研究院,北京 100083
- 折叠
摘要
为了评价南海近海海域 317L不锈钢的服役性能,保障水下油气生产设施安全运行,开展了天然海水腐蚀试验,结合电化学测试及腐蚀形貌观察、微生物检测等手段,表征了 317L不锈钢服役过程中的腐蚀特征及耐蚀性变化.结果表明:在南海近海海域滞留环境中长期服役的 317L 不锈钢存在点蚀风险,不锈钢钝化膜溶解与修复的动态平衡在 Cl-及微生物的共同作用下遭到破坏,腐蚀闭塞电池的自催化效应导致蚀坑内的金属基体活化溶解加速,点蚀风险增加.
Abstract
In order to evaluate the service performance of 317 L stainless steel in the offshore waters of the South China Sea and to ensure the safe operation of underwater oil and gas production facilities,natural seawater corrosion tests were carried out.The electrochemical testing,corrosion morphology observation,microbial detection and other methods were combined to characterize the corrosion characteristics and corrosion resistance changes of 317 L stainless steel during service.The results indicate that 317 L stainless steel posed a risk of pitting during long-term service in the detention environment near the South China Sea.The dynamic balance between the dissolution and repair of the stainless steel passivation film was disrupted by the combined action of Cl-and microorganisms.The autocatalytic reaction of the corrosion blocking battery led to accelerating activation and dissolution of the matrix in the corrosion pit,increasing the risk of pitting.
关键词
317L不锈钢/滞留海水/腐蚀行为/服役风险/自催化效应Key words
317 L stainless steel/stagnant seawater/corrosion behavior/corrosion risk/autocatalytic reaction引用本文复制引用
出版年
2024
NETL
NSTL
万方数据