含铜低碳钢在海洋环境下的耐蚀和防污性能的研究  

Corrosion Resistance and Antifouling Performance of Copper-bearing Low-carbon Steel in Marine Environment

作　　者：刘宏宇 张喜庆 滕莹雪[1] 李胜利[1] LIU Hongyu;ZHANG Xiqing;TENG Yingxue;LI Shengli(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学材料与冶金学院,鞍山114051

出　　处：《中国腐蚀与防护学报》2021年第5期679-685,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2017YFB0304201);国家自然科学基金(51974155,52074149);海工钢联合基金(SKLMEA-USTLN201902);辽宁科技大学研究生科技创新项目(LKDYC202002)。

摘　　要：采用自主设计的0Cu_(2)Cr钢,通过与Q345钢相对比,分别考察了在海洋环境下和硫酸盐还原菌(SRB)环境下二者的耐蚀和防污性能。结果表明,0Cu_(2)Cr钢的腐蚀电位和阻抗模值均大于Q345钢,腐蚀电流密度小于Q345钢,其耐蚀性明显优于Q345钢;0Cu_(2)Cr钢中的Cu使γ-FeOOH向更稳定的α-FeOOH转变,使锈层更致密,富集的Cu与析出的Cr形成Cu_(2)Cr_(2)O_(4)等氧化物,吸附在锈层周围,降低锈层导电性,保护基体,使0Cu_(2)Cr钢具有良好的耐蚀性;碳钢中的富Cu相导致SRB凋亡,使0Cu_(2)Cr钢具有良好的防污性能。A novel Cu-bearing low-carbon steel 0Cu_(2)Cr(with _(2).5%Cu)was independently designed and developed,then the corrosion resistance and antifouling performance of 0Cu_(2)Cr carbon steel and the ordinary weathering steel Q345 steel in natural seawater and the SRB culture medium were comparatively investigated.The results show that the corrosion potential and impedance loop diameters of 0Cu_(2)Cr steel are both greater than,and the corrosion current density is less than those of Q345 steel,namely the 0Cu_(2)Cr steel presents significantly better corrosion resistance,which may be ascribed to that the presence of Cu in 0Cu_(2)Cr steel can promote the transformation ofγ-FeOOH to the more stableα-FeOOH in the rust layer,hence the rust layer became denser,meanwhile the enriched copper and the precipitated Cr could form complex oxides such as Cu_(2)Cr_(2)O_(4),which are adsorbed around the rust layer,so that reduce the conductivity of the rust layer.As a result,the 0Cu_(2)Cr steel presents good corrosion resistance.On the other hand,the Cu-rich phase in carbon steel can lead to SRB apoptosis,so that 0Cu_(2)Cr steel has good antifouling properties.

关 键 词：含铜钢 SRB 耐蚀性 微观形貌 

分 类 号：TG172[金属学及工艺—金属表面处理]