3种海工低合金钢在盐雾及周浸环境中的腐蚀行为对比  

Comparation on corrosion behavior of three marine low alloy steels in salt spray and peripheral immersion environment

作　　者：赵培林 吴会亮 冷文俊 石西召 崔中雨 ZHAO Peilin;WU Huiliang;LENG Wenjun;SHI Xizhao;CUI Zhongyu(Laiwu Branch of Shandong Iron and Steel Co.,Ltd.,Jinan 271104,Shandong,China;School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,Shandong,China)

机构地区：[1]山钢股份莱芜分公司,山东济南271104 [2]中国海洋大学材料科学与工程学院,山东青岛266100

出　　处：《钢铁研究学报》2023年第6期739-747,共9页Journal of Iron and Steel Research

基　　金：山东省自然科学基金资助项目(ZR2020ME004)。

摘　　要：采用盐雾试验和周期浸泡试验模拟海洋环境以探究Q355B、HSS-3和S355NL三种海洋工程低合金钢的腐蚀行为。通过失重法、扫描电子显微镜、激光共聚焦显微镜对海工钢腐蚀动力学、锈层形貌、成分及表面腐蚀形态进行分析。结果表明:在2种试验条件下,腐蚀速率随着暴露时间的延长而降低并趋于稳定;盐雾试验中点蚀坑横向发展,逐渐发展为均匀腐蚀,周浸试验中干湿交替过程导致试样腐蚀加速、促进锈层下点蚀纵向发展;3种海工钢腐蚀产物构成无明显差异,由Fe3O4、α-FeOOH和γ-FeOOH组成,S355NL在2种试验条件下均生成更多的Fe3O4相,由于S355NL锈层致密度更高,在长周期腐蚀中具有最好的耐蚀性。Salt spray and periodic immersion tests were used to simulate the marine environment to explore the corrosion behavior of Q355B,HSS-3,and S355NL low alloy steels for marine engineering.The corrosion kinetics,rust morphology,composition,and surface corrosion morphology of marine steel were analyzed by weight-loss method,scanning electron microscope,and laser confocal microscope.The results show that under the two test conditions,the corrosion rate decreases and tends to be stable with the extension of exposure time;in the salt spray test,the pitting developed horizontally and gradually developed into uniform corrosion.The alternating process of dry and wet in the periodic immersion test accelerated the corrosion of the sample and promoted the longitudinal development of pitting under the rust layer;There is no obvious difference in the composition of corrosion products of the three kinds of offshore steel,which are composed of Fe3O4,α-FeOOH,andγ-FeOOH,S355NL generates more Fe3O4 phase under both test conditions.Because the S355NL rust layer has a higher density,it has the best corrosion resistance in long-term corrosion.

关 键 词：海工低合金钢 周浸试验 盐雾试验 腐蚀速率 腐蚀产物 

分 类 号：TG172.5[金属学及工艺—金属表面处理] TG142.33[金属学及工艺—金属学]