锌镍镀层耐高温封闭剂研究  

Investigation on high-temperature resistant sealants for zinc-nickel plating

作　　者：俞鼎行 李苓静 续小林 王志强 王振卫 李俊 Yu Dinghang;Li Lingjing;Xu Xiaolin;Wang Zhiqiang;Wang Zhenwei;Li Jun(School of Chemical and Environmental Engineering,Shanghai Institute of Technology,Shanghai 201418,China;Nantong CHAYO Electrochemical Technology Co.,Ltd.,Nantong 226503,China;Shanghai Supervision and Testing Center for Nonferrous Metals Industry CO.Ltd.,Shanghai 201800,China)

机构地区：[1]上海应用技术大学化学与环境工程学院,上海201418 [2]南通创源电化学科技有限公司,江苏南通226503 [3]上海有色金属工业技术检测中心有限公司,上海201800

出　　处：《电镀与精饰》2024年第5期85-91,共7页Plating & Finishing

摘　　要：在碱性锌镍滚镀线去氢工序中,传统封闭剂无法耐受高温,致使去氢步骤放在封闭步骤前,进而导致操作复杂而无法充分释放产能。本文旨在开发一种耐高温碱性锌镍封闭剂,实现去氢热处理步骤可以置于钝化封闭步骤之后,有助于提高锌镍镀层自动化水平。采用正交实验方法,结合场发射扫描电镜、X射线光电子能谱、傅里叶红外光谱、热重分析、塔菲尔曲线和交流阻抗等方法,研究了硅酸锂、硅酸钠、钨酸钠、磷酸二氢钠用量以及温度和时间对封闭层耐高温性能的影响。结果表明,在125 mL最佳封闭剂溶液中含有100 mL水、25 mL硅酸锂溶液、5 g硅酸钠、0.2 g钨酸钠、0.02 g磷酸二氢钠。将试件在其中浸泡10 min后取出,60℃干燥后在250℃去氢热处理3 h,得到的工件在ISO9227标准下红锈出现时间超过2000 h,远高于720 h无红锈行业标准。In the process of hydrogen removal in alkaline zinc-nickel roll plating lines,traditional sealing agents are unable to withstand high temperatures,resulting in the hydrogen removal step occurring before the sealing step.Consequently,this leads to complex operations and an inability to fully release production capacity.This article aims to develop a high-temperature resistant alkaline zinc-nickel sealing agent,allowing the hydrogen removal heat treatment step to be placed after the passivation sealing step,thereby contributing to the enhancement of the automation level of zinc-nickel plating.By employing an orthogonal experimental approach and combining techniques such as field emission scanning electron microscopy,X-ray photoelectron spectroscopy,Fourier-transform infrared spectroscopy,thermogravimetric analysis,Tafel curves,and alternating current impedance,the effects of lithium silicate,sodium silicate,sodium tungstate,sodium dihydrogen phosphate dosage,as well as temperature and time on the high-temperature resistance of the sealing layer were investigated.The results indicate that the optimal sealing agent solution contains 100mL of water,25mL of lithium silicate solution,5g of sodium silicate,0.2g of sodium tungstate,and 0.02g of sodium dihydrogen phosphate in a total volume of 125mL.After immersing the specimens in this solution for 10 minutes,followed by removal and drying at 60℃,a 3-h hydrogen removal heat treatment at 250℃ results in appearance of red rust occurred for more than 2000 hours on specimens under ISO9227 standard,which significantly surpass the 720 h without red rustindustrystandard.

关 键 词：封闭剂 镍镀层 磷酸二氢钠 X射线光电子能谱 滚镀 傅里叶红外光谱 塔菲尔曲线 硅酸锂 

分 类 号：TQ153.13[化学工程—电化学工业]