316L不锈钢在深海环境中的缝隙腐蚀行为研究  

Crevice Corrosion Behavior of 316L Stainless Steel in Deep-sea Environment

作　　者：李敏 胡凌越 胡科峰[2] 宋遥 张泽群 李宗欣 张博威 董超芳 吴俊升 LI Min;HU Lingyue;HU Kefeng;SONG Yao;ZHANG Zequn;LI Zongxin;ZHANG Bowei;DONG Chaofang;WU Junsheng(China Huanqiu Contracting&Engineering Co.,Ltd.,Beijing Huanqiu Corporation,Beijing 100012,China;Wuhan Second Ship Design Institute,Wuhan 430064,China;Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国寰球工程有限公司北京分公司,北京100012 [2]武汉第二船舶设计研究所,武汉430064 [3]北京科技大学新材料技术研究院,北京100083

出　　处：《中国腐蚀与防护学报》2023年第6期1375-1382,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51771027)。

摘　　要：采用深海暴露、模拟深海实验及电化学测试等方法,对316L不锈钢与同种金属、聚四氟乙烯(PTFE)、丁腈橡胶(NBR)组成的缝隙构型在深海环境中的腐蚀行为进行了评价研究。结果表明:在深海实海环境中暴露30 d后,316L不锈钢同种材料试样缝隙区域发生了均匀的腐蚀减薄,但腐蚀坑的深度相对较浅;而316L不锈钢与PTFE和NBR等惰性材料接触构成的缝隙,主要在缝隙边缘部分区域发生了局部腐蚀现象,呈现出向纵深优先发展的腐蚀扩展趋势。电化学测试结果显示,316L-316L不锈钢试样显示出最高的缝隙腐蚀倾向,而316L-NBR最低,316L-PTFE介于两者之间。深海模拟试验可以获得与深海实海暴露试验相一致的腐蚀规律,但在相同试验周期内,实海环境的缝隙腐蚀远比室内模拟环境更加严重。The corrosion behavior of crevice configurations composed of 316L stainless steel com-bined with the same steel,poly tetra fluoroethylene(PTFE)and nitrile butadiene rubber(NBR)respective-ly in seawater environment was investigated comprehensively by deep-sea exposure,simulation deep-sea testing and electrochemical technique.The results show that after 30 d of exposure in the deep-sea environment,in the crevice area of the couple of 316 stainless steels shows uniform corrosion thinning,but the depth of the corrosion pit is relatively shallow.However,the crevices composed of 316L stainless steel contacting with inert materials such as PTFE and NBR exhibit local corrosion mainly at the bound-ary of the crevice,showing a preferential trend of corrosion extending to the depth.The results of electro-chemical tests show that the crevice corrosion sensitivity of different configurations is 316L-316L>316L-PTFE>316L-NBR.The deep-sea simulation test can reproduce the same corrosion phenomena as the deep-sea exposure test,but for the same test period,the crevice corrosion of samples in the real-sea en-vironment is much more serious than that in the indoor simulation environment.

关 键 词：316L不锈钢 深海环境 模拟实验 实海暴露 缝隙腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]