微合金元素复合调控对Q345qE桥梁钢耐蚀性能的影响  

Effect of Microalloying Element Composite Adjustment on the Corrosion Resistance of Q345qE Bridge Steel

作　　者：袁昊 李学东 程丙贵 刘超 杨树峰[1,4] 李晓刚[2,3] YUAN Hao;LI Xue-dong;CHENG Bing-gui;LIU Chao;YANG Shu-feng;LI Xiao-gang(School of Metallurgy and Ecological Engineering,,University of Science and Technology Beijing,Beijing 100083,China;Institute of Advanced Materials and Technology,,University of Science and Technology Beijing,Beijing 100083,China;National Materials Corrosion and Protection Data Center,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Jiangsu Province(Sha-Steel)Institute of Research of Iron and Steel,Zhangjiagang 215600,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学新材料技术研究院,北京100083 [3]北京科技大学国家材料腐蚀与防护科学数据中心,北京100083 [4]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [5]江苏省(沙钢)钢铁研究院,江苏张家港215600

出　　处：《材料保护》2023年第6期46-54,88,共10页Materials Protection

基　　金：国家自然科学基金项目(52104319)资助。

摘　　要：为了研究微合金元素复合调控对Q345qE桥梁钢耐蚀性能的影响,利用共聚焦激光扫描显微镜(CLSM)、电化学工作站、场发射扫描电镜(FE⁃SEM)、X射线衍射(XRD)仪研究了合金元素Cr、Ni和Cu复合调控对Q345qE桥梁钢的耐蚀性能的影响规律。结果表明:Cr、Ni和Cu微合金元素复合调控提升了锈层的致密性和保护性。Q345qE桥梁钢表面锈层中的Cr元素可在内锈层中富集,有效阻挡了Cl-等侵蚀性离子的渗透和传递,增强了锈层对基体的保护能力。合金元素调控后,Q345qENH钢锈层中比γ⁃FeOOH更稳定的α⁃FeOOH所占比例增大。经过微合金元素复合调控的Q345qE桥梁钢相比于普通Q345qE在3.5%NaCl溶液中具有更好的耐蚀性。In order to investigate the effect of microalloying element composite adjustment on the corrosion resistance of Q345qE bridge steel,the influences of alloy element Cr,Ni,and Cu composite adjustment on the corrosion resistance of Q345qE bridge steel were studied by confocal laser scanning microscopy(CLSM),electrochemical workstation,field emission scanning electron microscopy(FE⁃SEM),and X⁃ray diffraction(XRD).Results showed that the compactness and protectiveness of the rust layer were improved after the composite adjustment of Cr,Ni and Cu microalloying elements.The Cr element in the rust layer on the Q345qE bridge steel surface could be enriched in the inner rust layer,which effectively blocked the penetration and transmission of corrosive ions such as Cl-and enhanced the protective ability of the rust layer on the substrate.After alloying element adjustment,the proportion ofα⁃FeOOH that was more stable thanγ⁃FeOOH in the rust layer of Q345qENH steel increased.Generally,Q345qE bridge steel with composite adjustment by microalloying elements possessed better corrosion resistance compared to ordinary Q345qE in 3.5%NaCl solution.

关 键 词：Q345qE 微合金元素 调控 耐蚀性能 

分 类 号：TG172[金属学及工艺—金属表面处理]