Reline体系中制备高耐腐蚀性Ni-Fe-Sm合金膜  

Preparation of High Corrosion Resistance Ni-Fe-Sm Alloy Films in Reline System

作　　者：赵静 陈必清 杜婵 朱云娜 张士民 ZHAO Jing;CHEN Biqing;DU Chan;ZHU Yunna;ZHANG Shimin(School of Chemistry and Chemical Engineering,Qinghai Normal University,Xining 810000,China)

机构地区：[1]青海师范大学化学化工学院,西宁810000

出　　处：《中国表面工程》2022年第2期80-90,共11页China Surface Engineering

基　　金：国家自然科学基金资助项目(22062020)。

摘　　要：针对在传统水溶液电解质中制备的Ni-Fe合金存在表面粗糙且耐腐蚀性能差的问题,在氯化胆碱-尿素离子液体体系(Reline)中,加入稀土元素Sm对Ni-Fe合金进行改性,制备Ni-Fe-Sm三元合金膜。采用循环伏安测试、塔菲尔测试、扫描电镜、X射线能谱仪研究金属离子在Reline离子液体中的电化学行为、合金膜表面形貌及其耐腐蚀性能。结果表明,Ni(Ⅱ)、Fe(Ⅱ)为一步不可逆还原过程,Ni-Fe-Sm合金在Reline体系中成核机制为三维瞬时成核。合金膜表面各金属元素分布均匀,微观结构呈瘤状球形颗粒,合金膜表面细致,裂纹少,排布整齐。在3.5 wt.%NaCl和10 wt.%HCl溶液中,加入稀土元素Sm,合金膜的耐腐蚀性能显著提高,当沉积电位为-1.22V,沉积时间为20min时,自腐蚀电流密度最小,腐蚀速度最低,自腐蚀电位最正,耐腐蚀性能最高。进一步丰富了在Reline体系中添加稀土元素提高合金耐腐蚀性能的认识,使其在防护、存储等领域有较好的应用前景。In order to solve the problem of rough surface and poor corrosion resistance of Ni-Fe alloys prepared in traditional aqueous electrolytes,the Ni-Fe-Sm ternary alloy membranes are prepared by adding rare earth element Sm to modify Ni-Fe alloy from choline chlorine-urea ionic liquid system(Reline).Through cyclic voltammetry,Tafel test,scanning electron microscope and X-ray energy spectrometer,respectively,the electrochemical behavior of metal ions in Reline ionic liquid,the surface morphology of alloy film and resistance corrosion performance are studied.The results show that Ni(Ⅱ)and Fe(Ⅱ)are one-step irreversible reduction processes,and the nucleation mechanism of Ni-Fe-Sm alloy in Reline system is three-dimensional instantaneous nucleation.The metal elements on the surface of the Ni-Fe-Sm alloy film are evenly distributed,and the microstructure is nodular spherical particles.The surface of the alloy film is fine,with few cracks and neat arrangement.In 3.5 wt.%NaCl and 10 wt.%HCl solutions,adding rare earth element Sm,the corrosion resistance of the alloy film is significantly improved.When the deposition potential is-1.22 V and the deposition time is 20 min,the self-corrosion current density is the lowest,the corrosion rate is the lowest,the self-corrosion potential is the most positive,and the corrosion resistance is the highest.This paper further enriches the understanding of adding rare earth elements to the Reline system to improve the corrosion resistance of alloys,making it have better application prospects in the fields of protection and storage.

关 键 词：恒电位电沉积 Reline离子液体 不可逆还原 成核机理 耐腐蚀性 

分 类 号：TQ153[化学工程—电化学工业]