铁锌合金在离子液体中的电沉积行为及其在Hank's溶液中腐蚀性能研究  

Electrodeposition behavior of Fe-Zn alloy in ionic liquid andsits corrosion performance in Hank's solution

作　　者：崔祥忠 王伟强[1] 于凤云[1] 许雅南 齐民[1] CUI Xiangzhong;WANG Weiqiang;YU Fengyun;XU Yanan;QI Min(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《功能材料》2022年第10期10016-10021,10031,共7页Journal of Functional Materials

摘　　要：探究在氯化胆碱-尿素低共熔溶剂(ChCl-UreaDES)中电沉积制备铁锌合金的可行性。使用循环伏安法(CV)和计时电流法(CA)研究Fe-Zn合金的还原行为和成核行为。使用电子探针(EPMA),X射线衍射仪(XRD)以及扫描电镜(SEM)研究沉积电位对Fe-Zn合金镀层的元素含量、相组成和微观形貌的影响。使用极化曲线对Fe-Zn合金的腐蚀行为进行研究。在含两种金属盐离子电解液中测得的CV结果说明,Fe(Ⅱ)与Zn(Ⅱ)可以在ChCl-UreaDES中共沉积。CA曲线的拟合结果表明,Fe-Zn合金的成核方式符合Scharifker-Hill三维成核模型且形核机制为三维渐进成核。EPMA结果显示沉积电位为-1.35V时合金中Zn的含量最高为7.4%。XRD结果显示Fe-Zn合金在不同沉积电位下均为α-Fe相。SEM结果显示,低电势下合金晶粒呈半球状生长,高电势下合金晶粒呈不规则团簇状生长。极化曲线结果表明Fe-Zn合金的腐蚀电流密度(J_(corr))大于纯Fe,其中Zn含量为4.3%的Fe-Zn合金的J_(corr)最大达5.70μA/cm^(2)。Fe(Ⅱ)和Zn(Ⅱ)在ChCl-UreaDES中可以实现共沉积并形成固溶体合金,且Fe-Zn合金的腐蚀速率比纯Fe快。The work aims to investigate the feasibility of electrodeposition of Fe-Zn alloy in choline chloride urea deep eutectic solvent(ChCl-Urea DES).The reduction behavior and nucleation behavior of Fe-Zn alloy were studied by cyclic voltammetry(CV)and chronoamperometry(CA).The effects of deposition potential on element content,phase composition and microstructure of Fe-Zn alloy coating were studied by electron probe microanalysis(EPMA),X-ray diffraction(XRD)and scanning electron microscope(SEM).The corrosion behavior of Fe-Zn alloy was studied by polarization curve.The CV curves measured in the electrolyte containing two metal salts showed that Fe(Ⅱ)and Zn(Ⅱ)was able to be co-deposited in ChCl-Urea DES.The fitting results of CA curves showed that the nucleation mode of Fe-Zn alloy conformed to the Scharifker-Hill three-dimensional nucleation model,and the nucleation mechanism was three-dimensional progressive nucleation.The EPMA results showed that the highest content of Zn in the alloy was 7.4%when the deposition potential was-1.35 V.The XRD results showed that Fe-Zn alloy wasα-Fe phase at different deposition potentials.The SEM results showed that the alloy grains grew in hemispherical shape at low potential and in irregular clusters at high potential.The results of polarization curves showed that the corrosion current density(J_(corr))of Fe-Zn alloy was greater than that of pure Fe,and the J_(corr) of Fe-Zn alloy with Zn content of 4.3%was up to 5.70μA/cm^(2).It could be concluded that Fe(Ⅱ)and Zn(Ⅱ)can be co-deposited and form solid solution alloy in ChCl-urea DES,and the corrosion rate of Fe-Zn alloy is faster than that of pure Fe.

关 键 词：铁锌合金 低共熔溶剂 电沉积 腐蚀性能 相组成 

分 类 号：TQ153.2[化学工程—电化学工业]