Zn-Al合金牺牲阳极材料的稀土(La,Ce)改性研究  

Rare Earth(La,Ce)Modification of Zn-Al Alloy Sacrificial Anode Materials

作　　者：南雪丽[1] 唐维斌 李晓民 魏定邦 许辉 Nan Xueli;Tang Weibin;Li Xiaomin;Wei Dingbang;Xu Hui(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730000,China;Gansu Highway Administration Burea,Lanzhou 730030,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730000 [3]甘肃省公路管理局,甘肃兰州730030

出　　处：《稀有金属》2021年第6期664-672,共9页Chinese Journal of Rare Metals

基　　金：甘肃省交通厅科研项目(2017-16,2017-19);甘肃省住房和城乡建设厅项目(JK2017-15)资助。

摘　　要：锌合金阳极在钢筋混凝土结构的防腐中有着广泛的应用。锌合金阳极的合金化改性是近几年研究的热点之一,但稀土改性Zn-Al合金阳极电化学性能的研究相对较少。为了改善Zn-Al合金阳极的电化学性能和耐腐蚀性,本文采用光学显微镜(OM)、X射线荧光(XRF)、扫描电镜(SEM)和X射线衍射(XRD)分析,并结合恒电流腐蚀测试、电化学极化曲线测试和电化学阻抗测试等手段,研究了不同稀土含量对ZnAl合金阳极材料电化学性能和耐腐蚀性的影响。研究结果表明:稀土元素(La,Ce)的添加对Zn-Al合金阳极的组织有明显细化作用,改善了Zn-Al合金阳极的表面溶解形貌,提高电流效率,进而提高电化学性能;而且随着稀土含量的增加Zn-Al阳极耐腐蚀性先提高后降低,当稀土含量为0.6%时,电化学性能和耐蚀性表现最佳。这主要是由于稀土元素(La,Ce)的加入对Zn-Al合金阳极组织具有明显细化作用,且表面腐蚀产物层具有主动防腐性能,降低腐蚀活性。Zinc alloy was the main cathodic protection material in concrete environment.Zn-Al alloy,as a sacrificial anode material,had high current efficiency and low polarizability,and its performance was similar to that of pure zinc.However,the existence of impurity elements such as Fe and Cu in the anode material of Zn-Al alloy affected its corrosion solubility and electrochemical performance seriously,which directly affected the service life of reinforced concrete structures.Therefore,the alloying technology to eliminate the influence of impurity elements,could be used to improve the electrochemical and mechanical properties of Zn-Al alloy,besides make its applicance more widely.The development of cathodic protection technology was one of the effective measures for the protection of reinforced concrete structures in the future.This study based on the theory of the alloying of metals,and the combination of sacrificial anode cathodic protection technology in the practical application of anti-corrosion of reinforced concrete structure,starting from the electrochemical performance of cathodic protection materials,anode materials for zinc alloy,effects on the electrochemical properties of impurity element in Zn-Al alloy anode material as the research object,the preparation of different contents of rare earth(La,Ce)of Zn-Al alloy anode material,and using optical microscope(OM),X-ray fluorescence(XRF)and scanning electron microscope(SEM)and X-ray diffraction(XRD)analysis.The effects of mixed rare earth(La,Ce)on the anodic dissolution morphology,corrosion resistance and electrochemical properties of Zn-Al alloy were investigated by electrochemical measurement,such as galvanostatic corrosion test,electrochemical polarization curve test and electrochemical impedance spectroscopy test.Through the analysis of the above different test methods,the research conclusions were as follows:(1)It could be seen from the metallographic structure photos of the anode material of Zn-Al alloy that the addition of rare earth elements(La,Ce)could

关 键 词：ZN-AL合金 牺牲阳极 稀土 电化学性能 耐腐蚀性 

分 类 号：TF813[冶金工程—有色金属冶金]