深冷处理对EH40极寒环境船用钢板的海水腐蚀性能影响  

Corrosion Behavior in Artificial Seawater of Subzero Treated EH40 Marine Steel Suitable for Extremely Cold Environments

作　　者：沈树阳 王东胜 孙士斌[2] 杨剔 赵前进 王鑫[2] 张亚飞 常雪婷 SHEN Shuyang;WANG Dongsheng;SUN Shibin;YANG Ti;ZHAO Qianjing;WANG Xin;ZHANG Yafei;CHANG Xueting(College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;College of Logistics Engineering,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学海洋科学与工程学院,上海201306 [2]上海海事大学物流工程学院,上海201306

出　　处：《中国腐蚀与防护学报》2020年第2期151-158,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2016YFB0300700);上海市教委曙光计划项目(19SG46);上海市自然科学基金(17ZR1440900);科技部国际合作交流项目(CU03-29)。

摘　　要：采用模拟浸泡实验技术,结合腐蚀形貌分析以及动电位极化和电化学阻抗技术研究了深冷处理对EH40极寒环境船用钢板在3.5%(质量分数)NaCl溶液中的海水腐蚀行为。结果表明:未经深冷处理的极寒环境船用钢板表面发生均匀腐蚀,在样品表面有均匀致密的腐蚀层产生;而经过-80℃深冷处理的钢板试样表面发生点蚀现象,其腐蚀失重增加,腐蚀速率由1.15 mm/a升至1.33 mm/a,增幅约为15.6%,同时腐蚀电流密度由1.244μA·cm^-2升至3.643μA·cm^-2,电化学阻抗值减小,耐蚀性降低;两者的腐蚀产物以α-FeOOH、β-FeOOH和γ-FeOOH为主。较低的环境温度对于极寒环境船用钢板的耐腐蚀性能有一定的影响。The corrosion behavior in artificial seawater of a marine steel plate suitable for extremely cold environments,EH40 steel before and after subzero treatment was studied by means of immersion test,electrochemical polarization curve measurement,electrochemical impedance spectroscopy,X-ray diffractometer and scanning electron microscope.Results showed that uniform corrosion occurred on the steel before subzero treatment,leading to the formation of a dense corrosion product scale on the steel surface.Whereas,pitting corrosion emerged on the steel subjected to subzero treatment at-80℃.The mass loss and corrosion current density of the steel before subzero treatment were 1.15 mm/a and 1.244μA·cm^-2,respectively,which increased to 1.33 mm/a and 3.643μA·cm^-2 for the steel after subzero treatment,indicating that the subzero treatment could reduce the corrosion resistance of the steel.The corrosion products for the steels before and after subzero treatment were composed ofα-FeOOH,β-FeOOH,andγ-FeOOH.Therefore,low ambient temperature has certain degree of negative impact on the corrosion resistance of marine steel plate in extremely cold environments.

关 键 词：极寒船用钢 腐蚀性能 深冷处理 浸泡实验 电化学测试 

分 类 号：TB304[一般工业技术—材料科学与工程]