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

doi:10.11902/1005.4537.2021.084

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

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

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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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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

Received: 19 April 2021

ZTFLH:

TG174

Fund: National Natural Science Fundation of China(51961028)

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

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

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Cite this article:

LIU Yongqiang, LIU Guangming, FAN Wenxue, GAN Hongyu, TANG Rongmao, SHI Chao. 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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.084 OR https://www.jcscp.org/EN/Y2022/V42/I2/235

Fig.1 Schematic diagram of Zn-Ni alloy electrodeposition device

Fig.2 Measured cyclic voltammetry curves in different plating solutions: (a) PEG-600+ basic plating solution without Zn and Ni; (b) PEG-600+basic plating solution without Ni; (c) PEG-600+ basic plating solution without Zn; (d) Zn-Ni alloy bath+without PEG-600 and Zn-Ni alloy bath+with PEG-600

Fig.3 Infrared spectrum of Zn-Ni alloy coating

Fig.4 Surface morphology and energy spectrum (point 1~4 in Fig.4a~d) of Zn-Ni alloy coatings with different concentrations of PEG-600 added to the basic bath: (a) blank, (b) 1.67×10^-2 mol/L, (c) 3.33×10^-2 mol/L, (d) 4.16×10^-2 mol/L

Fig.5 X-ray diffraction pattern of Zn-Ni alloy coating obtained by electrodeposition without adding PEG-600 and adding 3.33×10^-2 mol/L PEG-600 in the basic plating solution

Fig.6 Polarization curves of Zn-Ni alloy coatings with different contents of PEG-600 added to the basic bath

Table 1 Polarization curve fitting parameters of PEG-600 electrodeposited Zn-Ni alloy coating with different contents in the basic bath

Fig.7 Nyquist (a) and Bode (b) diagrams of electrode-posited Zn-Ni alloy coatings with different contents of PEG-600 added to the basic bath

Fig.8 Equivalent circuit of electrochemical impedance spectroscopy of Zn-Ni alloy coating

Table 2 Fitting parameters of electrochemical impedance spectroscopy equivalent circuit of Zn-Ni alloy coating

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