2205双相不锈钢在南海深水环境中的腐蚀行为  

Corrosion Behavior of 2205 Duplex Stainless Steel in Deep Seawater of South China Sea

作　　者：宋积文[1] 王毛毛 张亮[1] 李大朋 陈胜利[1] 王修云 常炜 张雷 SONG Jiwen;WANG Maomao;ZHANG Liang;LI Dapeng;CHEN Shengli;WANG Xiuyun;CHANG Wei;ZHANG Lei(CNOOC Information Technology Co.,Ltd.Beijing Branch,Beijing 100027,China;Safetech Research Institute(Beijing)Co.,Ltd.,Beijing 100083,China;CNOOC Research Institute Ltd.Beijing 100028,China;Institute for Advanced Materials and Technology Beijing,University of Science and Technology,Beijing 100083,China)

机构地区：[1]中海油信息科技有限公司北京分公司,北京100027 [2]安科工程技术研究院(北京)有限公司,北京100083 [3]中海油研究总院有限公司,北京100028 [4]北京科技大学新材料技术研究院,北京100083

出　　处：《腐蚀与防护》2019年第12期898-901,915,共5页Corrosion & Protection

摘　　要：利用腐蚀挂片试验与循环极化测试的方法,结合光学显微镜、扫描电子显微镜(SEM)、能谱仪(EDS)等测试手段研究了2205双相不锈钢在南海水下170m海水中的腐蚀行为。结果表明:2205双相不锈钢在深海环境中发生了局部腐蚀;浸泡初期,不锈钢表面形成微生物保护膜,在微生物膜的保护下其耐蚀性能提高;随着浸泡时间的延长,微生物死亡、脱落,失去对金属基体的保护作用,导致不锈钢耐蚀性能下降;同时,残留的微生物膜与不锈钢基体间形成缝隙,在溶解氧与Cl^-作用下发生缝隙腐蚀,形成局部腐蚀坑。The corrosion behavior of 2205 duplex stainless steel in the seawater under 170 mof South China Sea was studied by coupon corrosion testing and cyclic polarization testing in combination with scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show that localized corrosion occurred on the 2205 duplex stainless steel in deep-sea environment.At the initial stage of immersion,a microbial protective film was formed on the surface of the 2205 duplex stainless steel,and the corrosion resistance of the stainless steel improved under the protection of the microbial film.As the immersing time increased,microorganisms died and sloughed off,and then lost the protection for metal substrate,resulting in the decrease of corrosion resistance of the 2205 duplex stainless steel.A gap was formed between the residual microbial film and the stainless steel substrate,and crevice corrosion occurred under the action of dissolved oxygen and Cl^- to form localized corrosion pits.

关 键 词：2205双相不锈钢 深海环境 微生物膜 缝隙腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]