316L不锈钢在海洋深水环境中的局部腐蚀规律  

Localized Corrosion Law of 316L Stainless Steel in Deep Seawater

作　　者：刘殿宇 王毛毛 张亮[3] 李大朋 常炜 王修云 王润[3] 张雷 LIU Dian-yu;WANG Mao-mao;ZHANG Liang;LI Da-peng;CHANG Wei;WANG Xiu-yun;WANG Run;ZHANG Lei(Baiyun Natural Gas Operations of CCLS,Shenzhen 518067,China;Anko Engineering Technology Institute Limited Company,Beijing 100083,China;CNOOC Information Technology Co.,Ltd.Beijing Branch,Beijing 100027,China;CNOOC Research Institute Ltd.,Beijing 100028,China;University of Science and Technology Beijing Institutefor Advanced Materials and Technology,Beijing 100083,China)

机构地区：[1]中海油(深圳)有限公司白云天然气作业公司,广东深圳518067 [2]安科工程技术研究院(北京)有限公司,北京100083 [3]中海油信息科技有限公司北京分公司,北京100027 [4]中海油研究总院有限公司,北京100028 [5]北京科技大学新材料技术研究院,北京100083

出　　处：《装备环境工程》2019年第1期102-106,共5页Equipment Environmental Engineering

摘　　要：目的研究316L不锈钢在海洋深水环境中的局部腐蚀规律。方法利用自行设计的实验装置在南海170 m水深位置开展316L不锈钢腐蚀模拟实验,并通过电化学测试方法与扫描电子显微镜(SEM)、能谱仪(EDS)等测试手段进行分析。结果浸泡7天时,316L不锈钢表面发生局部腐蚀,但微生物吸附会形成保护性的微生物膜,引起其自腐蚀及击穿电位正移,耐点蚀性能会升高。随着浸泡时间的延长,溶解氧含量逐渐降低,试样表面吸附的微生物膜性质发生变化,导致钝化膜在微生物与Cl-的作用下破裂,自腐蚀电位及击穿电位负移,耐点蚀性能下降。结论 316L不锈钢在海洋深水环境中的耐点蚀性能随着浸泡时间的延长,先降低而后增加。Objective To study the localized corrosion law of 316L stainless steel in deep-sea water.Methods The experiment was carried out to study the corrosion law of 316L stainless steel with the self-developing experimental provision in 170m water depth,together with cyclic polarization curves,SEM and EDS.Results Pitting corrosion occurred for 316L stainless steel after 7 days of immersion.But protective microbial film would form for adsorption of microorganism.It would lead to self-corrosion and positive shift of breakdown potential.The pitting resistance might increase.As the immersing time increased,the content of oxygen dissolved decreased,the property of microbial film on the sample surface changed.The passive film broke under the action of microorganism and Cl^-.The self-corrosion and breakdown potential shifted negatively.The pitting corrosion resistance decreased.Conclusion The corrosion resistance of 316L stainless steel decreased and then increased with the increase of immersion.

关 键 词：316L不锈钢 海洋深水环境 生物膜 点腐蚀 

分 类 号：X[环境科学与工程]