温度和甲酸镍含量对制备Zn-Ni合金渗层的影响  

Effect of Temperature and Nickel Formate Content on the Preparation of Zn⁃Ni Cementation Layer

作　　者：徐鹏辉 王胜民[1] 乐林江 肖敏 赵晓军[1] XU Penghui;WANG Shengmin;LE Linjiang;XIAO Min;ZHAO Xiaojun(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yan Cheng Keao Machinery Co.,Ltd.,Yancheng 224008,Jiangsu,China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]盐城科奥机械有限公司,江苏盐城224008

出　　处：《材料导报》2023年第16期205-212,共8页Materials Reports

基　　金：国家自然科学基金(52161013)。

摘　　要：为改善渗锌层的防腐性能,通过在渗锌过程添加甲酸镍制备了Zn-Ni合金渗层,分析了不同温度(400℃、450℃、500℃、550℃、600℃)和不同甲酸镍含量(0 g、15 g、44 g、75 g、103 g)对渗层制备过程的影响。采用扫描电镜(SEM,配备有EDS能谱)、X射线衍射仪(XRD)分析了不同试样渗层截面形貌和物相组成;采用电化学极化曲线和阻抗谱(EIS)表征了不同试样在3.5%(质量分数,下同)NaCl溶液中的电化学行为,并通过中性盐雾实验测试了渗层的耐蚀性能;利用显微维氏硬计测试渗层表面至基体不同相层硬度。结果表明:随温度的升高渗层显著增厚,渗层表面硬度降低;随甲酸镍含量的增加渗层明显减薄,渗层中ZnO、Fe_(3)ZnC_(0.5)相衍射峰明显增强,渗层中间相层硬度值增大;温度和甲酸镍含量对渗层自腐蚀电位无明显影响,腐蚀电流密度随温度的升高而增大,随甲酸镍含量的增大而明显减小;试样阻抗弧半径和渗层电阻均随甲酸镍含量的增加而增大;甲酸镍含量越高,对盐雾实验白锈的出现抑制越明显,出现红锈的时间显著延长。综上所述,添加甲酸镍显著改善了渗锌层的组织结构,明显提高了渗层的耐腐蚀性能,这对促进锌-镍合金共渗技术的应用具有积极意义。In order to improve the anti⁃corrosion performance of sherardizing layer,zinc⁃nickel alloy cementation layer was prepared by adding nickel formate in the sherardizing process.The effects of temperature(400℃,450℃,500℃,550℃,600℃)and nickel formate content(0 g,15 g,44 g,75 g,103 g)on the formation process of the infiltration layer are analyzed.Scanning electron microscope(SEM,equipped with EDS spectrum)and X⁃ray diffractometer(XRD)were used to analyze the cross⁃sectional morphology and phase composition of different samples;lectrochemical polarization curve and impedance spectroscopy(EIS)were used to characterize the different the electrochemical behavior of the sample in 3.5wt%NaCl solution,and the corrosion resistance of the cementation layer was tested by a neutral salt spray experiment;the hardness of different phase layers from the surface of the cementation layer to the substrate was tested by a micro Vickers hardness tester.The results show that:with the increase of temperature,the cementation layer is thickens obviously and the surface hardness of the cemented layer decreases;with the increase of nickel formate content,the cementation layer is thins obvlously,and the diffraction peaks of ZnO and Fe_(3)ZnC_(0.5) phase are significantly enhanced,and the intermediate phase of the cementation layer􀆳s hardness value increases;temperature and nickel formate content have no obvious effect on the self⁃corrosion potential.The corrosion current density increases with the increase of temperature,and obviously decreases with the increase of nickel formate content;the sample impedance arc radius and the resistance of the cementation layer increases with the increase of nickel formate content;the higher the nickel formate content,the less white rust appears in the salt spray test,and the time for red rust appears to be significantly longer.In summary,the addition of nickel formate significantly improves the structure of the sherardized layer,and significantly improves the corrosion resistance of the

关 键 词：Zn-Ni合金渗层 电化学行为 渗层显微硬度 耐腐蚀性 甲酸镍含量 

分 类 号：TG147.445[一般工业技术—材料科学与工程]