聚乙二醇-600对酸性Zn-Ni合金的电沉积行为及镀层耐蚀性影响的研究

doi:10.11902/1005.4537.2021.084

中国腐蚀与防护学报

2022, Vol. 42

Issue (2): 235-242 DOI: 10.11902/1005.4537.2021.084

研究报告

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聚乙二醇-600对酸性Zn-Ni合金的电沉积行为及镀层耐蚀性影响的研究

刘永强¹, 刘光明¹(

), 范文学², 甘鸿禹¹, 唐荣茂¹, 师超¹

^1.南昌航空大学材料科学与工程学院南昌 330063
^2.安徽鼎旺环保材料科技有限公司宣城 242000

Effect of Polyethylene Glycol-600 on Acidic Zn-Ni Alloy Electroplating and Its Corrosion Resistance

LIU Yongqiang¹, LIU Guangming¹(

), FAN Wenxue², GAN Hongyu¹, TANG Rongmao¹, SHI Chao¹

^1.School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.China Anhui Dingwang Environmental Protection Material Technology Co. Ltd. , Xuancheng 242000, China

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摘要:

采用循环伏安 (CV) 曲线研究了聚乙二醇-600 (PEG-600) 在酸性Zn-Ni合金基础镀液中对Zn-Ni合金电沉积行为的影响；采用电化学阻抗谱 (EIS)、动电位极化曲线与表面形貌分析方法研究了酸性Zn-Ni合金基础镀液中，聚乙二醇-600的浓度对Zn-Ni合金镀层表面微观形貌及耐蚀性的影响。结果表明，PEG-600作为一种非离子型表面活性剂，在基体镀件表面具有较强的吸附能力，基础镀液中添加PEG-600会影响Zn-Ni合金的电沉积过程，使Zn²⁺与Ni²⁺更难迁移至镀件表面，导致Zn-Ni合金的共沉积峰位置向更负电位方向移动，从而使阴极过电位升高。基础镀液中随PEG-600浓度的增加，电沉积所得Zn-Ni合金镀层的耐蚀性呈先增大后减小的趋势。当PEG-600浓度为3.33×10^-2 mol/L时，Zn-Ni合金镀层耐蚀性能达到最佳，其电化学阻抗模值为1960 Ω·cm²、自腐蚀电流为1.97×10^-5 A·cm^-2，并且能得到均一的金属间化合物γ相和最优的表面微观形貌。

关键词 ：聚乙二醇-600, 酸性Zn-Ni镀液, 电沉积, 耐蚀性

Abstract：

The effect of polyethylene glycol-600 (PEG-600) on the acidic Zn-Ni alloy plating process was studied by means of cyclic voltammetry (CV) curve measurement. The influence of the concentration of polyethylene glycol-600 (PEG-600) in the acidic Zn-Ni alloy plating electrolyte on the corrosion resistance and the surface morphology of the Zn-Ni alloy coatings was characterized via electrochemical impedance spectroscopy (EIS), Taffel polarization curve measurement and surface morphology analysis method. The results show that PEG-600, as a non-ionic surfactant, has a strong adsorption capacity on the surface of cathode. The addition of PEG-600 to the plating electrolyte will affect the electroplating process of the Zn-Ni alloy, making it more difficult for Zn²⁺ and Ni²⁺ to move to the surface of the cathode, as a result, the co-deposition peak position of Zn-Ni may move towards negative potential direction, so that the cathode overpotential rises. With the increase of the concentration of PEG-600 in the plating electrolyte, the corrosion resistance of the electroplated Zn-Ni alloy coating increases first and then decreases. When the concentration of PEG-600 is 3.33×10^-2 mol/L, the corrosion resistance of the electroplated Zn-Ni alloy coating reaches the best, namely the coating with electrochemical impedance of 1960 Ω·cm² and free-corrosion current of 1.97×10^-5 A·cm^-2, and the Zn-Ni alloy coating consists of uniformly intermetallic compound γ phase with better surface morphology in micro scale.

Key words： polyethylene glycol-600 acidic Zn-Ni plating bath electrodeposition corrosion resistance

收稿日期: 2021-04-19

ZTFLH:

TG174

基金资助:国家自然科学基金(51961028)

通讯作者: 刘光明 E-mail: gemliu@126.com

Corresponding author: LIU Guangming E-mail: gemliu@126.com

作者简介: 刘永强，男，1996年生，硕士生

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引用本文:

刘永强, 刘光明, 范文学, 甘鸿禹, 唐荣茂, 师超. 聚乙二醇-600对酸性Zn-Ni合金的电沉积行为及镀层耐蚀性影响的研究[J]. 中国腐蚀与防护学报, 2022, 42(2): 235-242.
Yongqiang LIU, Guangming LIU, Wenxue FAN, Hongyu GAN, Rongmao TANG, Chao SHI. Effect of Polyethylene Glycol-600 on Acidic Zn-Ni Alloy Electroplating and Its Corrosion Resistance. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 235-242.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.084 或 https://www.jcscp.org/CN/Y2022/V42/I2/235

图1 Zn-Ni合金电沉积装置示意图

图2 不同镀液中所测循环伏安曲线

图3 Zn-Ni合金镀层的红外光谱图

图4 基础镀液中添加不同浓度的PEG-600电沉积所得Zn-Ni合金镀层的表面形貌及能谱

图5 基础镀液中未添加与添加PEG-600后电沉积所得Zn-Ni合金镀层的XRD谱

图6 基础镀液中添加不同浓度的PEG-600电沉积Zn-Ni合金镀层的极化曲线

表1 基础镀液中添加不同浓度的PEG-600电沉积Zn-Ni合金镀层的极化曲线拟合参数

图7 基础镀液中添加不同浓度PEG-600的电沉积Zn-Ni合金镀层的电化学阻抗谱

图8 Zn-Ni合金镀层电化学阻抗谱的等效电路

表2 Zn-Ni合金镀层电化学阻抗谱等效电路的拟合参数

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