摘要
目的研究表面活性剂十六烷基三甲基溴化铵(CTAB)与聚乙二醇2000(PEG)对Zn-In合金镀层性能的影响。方法采用单因素试验确定了CTAB与PEG的含量,使用响应曲面法建立耐蚀性能测试参数与表面活性剂含量之间的数学模型。实验采用线性电位扫描,并采用维氏显微硬度仪,接触角测试仪、SEM、EDS和XRD对电镀锌-铟合金镀层的析氢行为、硬度、表面湿润性、表面形貌、元素种类以及物相组成进行表征。结果通过响应曲面法建立了耐腐蚀性能参数与CTAB和PEG含量之间的数学模型,获得复合表面活性剂组成,镀层的耐蚀性良好;接触角测试结果显示,未加添加剂的膜层表面湿润角为56°,优化后镀层表面湿润角仅为25°,具有较好的亲水性,且由于晶粒细化使试样硬度提升;镀层主要由Zn、In、C、O等元素组成,加入表面活性剂对镀层的影响不大,金属铟的生长晶面主要为(101)和(102)晶面。结论最佳添加复合表面活性剂的比例为CTAB0.33g/L,PEG0.87g/L,电镀液中添加表面活性剂后能够有效提升镀层耐腐蚀性能,有效抑制了析氢反应。
The metal zinc is currently the most commonly used anode material in aqueous zinc-ion batteries,due to its advantages of being environmentally friendly,having a large capacity,and low cost.However,it has some drawbacks such as hydrogen evolution,dendrite formation,and susceptibility to corrosion during charge-discharge processes.In this study,a layer of zinc-indium alloy was deposited on the surface of metallic zinc.On one hand,the high hydrogen evolution overpotential of indium effectively suppresses the hydrogen evolution reaction;and on the other hand,it improves the corrosion resistance and mechanical properties of the negative electrode material.The work aims to investigate the effect of surfactants on the quality of electroplated zinc-indium coatings.The effect of addition of surfactants cetyltrimethyl ammonium bromide(CTAB)and polyethylene glycol 2000(PEG)on the corrosion resistance of electrogalvanized indium was investigated by single factor experiment.On this basis,the two-factor five-level central composite design method(CCD)was used to design experiments,and the quadratic response surface models of charge transfer resistance Rf and polarization resistance Rp were established through experiments and variance analysis.The optimal ratio of CTAB 0.33 g/L and PEG 0.87 g/L were finally obtained.The hydrogen evolution behavior,hardness,surface wettability,surface morphology,elements and phase composition of Zinc-indium alloy coatings were characterized by linear potential scanning,Vickers microhardness tester,contact angle tester,SEM,EDS and XRD,respectively.The experimental results showed that the cathode polarization curve changed obviously with the addition of the composite surfactant.Compared with the hydrogen evolution potential of pure Zn(-1.833 V),the hydrogen evolution potential of the two Zinc-indium alloys had an obvious negative shift.The Zinc-indium alloy prepared without additives had a potential of-1.985 V,while the Zinc-indium alloy prepared with surfactants had a more negative potential(-2.053 V).It showed that the coating obtained by the composite surfactant could inhibit the hydrogen evolution reaction.The contact angle test results showed that the surface wetting angle of the prepared coating was 56°compared with that of the coating without additives,and the surface wetting angle of the optimized coating was only 25°.The zinc-indium coating had better hydrophilic properties and higher hardness than the metal zinc coating.SEM test results showed that the composite surfactant could effectively improve the grain growth on the surface of the coating,which was more irregular,solving the coarse grain problems,and the coating after addition was relatively uniform and fine.The test results showed that the main elements of the coating were Zn,In,C and O,and the coating composition was not affected by the addition of surfactant before and after the plating solution.The coating was mainly composed of zinc and indium.XRD results showed that the peak strength and peak width of the coating prepared by adding surfactant were smaller and wider than those without adding surfactant.This showed that the grain size of the coating with additive was smaller than that without additive,and the growth crystal surface of metal indium was mainly distributed in the(101)and(102)crystal faces.
作者
邹忠利
李洋
单玺畅
米志娟
张旭
ZOU Zhongli;LI Yang;SHAN Xichang;MI Zhijuan;ZHANG Xu(School of Materials Science and Engineering,North Minzu University,Yinchuan 750021,China)
出处
《表面技术》
北大核心
2025年第2期137-147,共11页
Surface Technology
基金
宁夏自然科学基金项目(2023AAC03265)
宁夏回族自治区重点研发计划(引才专项)(2021BEB04027)。
关键词
Zn-In合金
表面活性剂
响应曲面法
恒电流沉积
耐蚀性
Zn-In alloy
surfactant
response surface method
constant current deposition
corrosion resistance
