首页|锌镍镀层耐高温封闭剂研究

锌镍镀层耐高温封闭剂研究

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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.
Investigation on high-temperature resistant sealants for zinc-nickel plating
In the process of hydrogen removal in alkaline zinc-nickel roll plating lines,traditional seal-ing 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 seal-ing 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 employ-ing an orthogonal experimental approach and combining techniques such as field emission scanning electron microscopy,X-ray photoelectron spectroscopy,Fourier-transform infrared spectroscopy,ther-mogravimetric analysis,Tafel curves,and alternating current impedance,the effects of lithium sili-cate,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 100 mL of water,25 mL of lithium silicate solution,5 g of sodium silicate,0.2 g of sodium tungstate,and 0.02 g of sodium dihydrogen phosphate in a total volume of 125 mL.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.

zinc-nickel platinglithium silicatehigh-temperature resistant sealant

俞鼎行、李苓静、续小林、王志强、王振卫、李俊

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上海应用技术大学 化学与环境工程学院,上海 201418

南通创源电化学科技有限公司,江苏 南通 226503

上海有色金属工业技术检测中心有限公司,上海 201800

zinc-nickel plating lithium silicate high-temperature resistant sealant

2024

电镀与精饰
天津市电镀工程学会

电镀与精饰

CSTPCD北大核心
影响因子:0.522
ISSN:1001-3849
年,卷(期):2024.46(5)
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