Electrodeposition Behavior of Silver in an Alkaline DMH Plating Bath with 5,5-Dimethylhydantoin as Complexing Agent

doi:10.11902/1005.4537.2022.262

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 896-902 DOI: 10.11902/1005.4537.2022.262

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Electrodeposition Behavior of Silver in an Alkaline DMH Plating Bath with 5,5-Dimethylhydantoin as Complexing Agent

CHEN Huimin¹, WANG Shuaixing¹(

), ZHANG Qi², ZHAN Zhongwei², DU Nan¹

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

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Abstract

Electroplating silver is carried out in an alkaline DMH plating bath with 5,5-dimethylhydantoin (DMH) as complexing agent. The cathodic reduction process of silver from alkaline DMH plating bath is analyzed by chronopotentiometry, cathodic polarization curve and electrochemical impedance spectroscopy (EIS), meanwhile, the nucleation/growth mechanism of silver are also studied by cyclic voltammetry and chronoamperometry, finally the electrodeposition behavior of silver in alkaline DMH complex system is comprehensively discussed. The results show that the main form of silver complex ions in the alkaline DMH plating system is [Ag(C₅H₇N₂O₂)₂]^-, which is converted to [Ag(C₅H₇N₂O₂)] through a preceding reaction and discharged directly on the cathode. The electrodeposition process of silver in this system is an irreversible electrode reaction controlled by diffusion step. Besides, the electrodeposition of silver undergoes a nucleation process and follows a three-dimensional transient nucleation mechanism.

Key words: 5,5-dimethylhydantoin silver electrodeposition nucleation mechanism

Received: 27 August 2022 32134.14.1005.4537.2022.262

ZTFLH:

TG179

Fund: Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province(20204BCJL23033);Industry-University-Reserch Cooperation Program of Aero Engine Corporation of China(HFZL2020CXY026);Jiangxi Postgraduate Innovation Fund(YC2021-S654)

Corresponding Authors: WANG Shuaixing, E-mail: wsxxpg@126.com

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Cite this article:

CHEN Huimin, WANG Shuaixing, ZHANG Qi, ZHAN Zhongwei, DU Nan. Electrodeposition Behavior of Silver in an Alkaline DMH Plating Bath with 5,5-Dimethylhydantoin as Complexing Agent. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 896-902.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.262 OR https://www.jcscp.org/EN/Y2023/V43/I4/896

Fig.1 Relationship between lnc (C₅H₇N₂O $2 -$ ) and equilibrium potential

Fig.2 Chronopotentiometric curves of silver electrodeposition in alkaline DMH solutions

Fig.3 Relationship curve between Iτ^1/2 and i

Fig.4 Cathodic polarization curves of bath systems with different DMH content

Fig.5 Relationship curve between lnI and ln[c(C₅H₇N₂O )] at -0.50 V

Fig.6 Cyclic voltammetry of Ag deposition on glassy carbon electrode

Table 1 Cyclic voltammetry curve data at different scanning speeds

Fig.7 Electrochemical impedance spectroscopy for the electrodeposition of silver at -0.70~-0.90 V (a) and -1.00 V (b) deposition potentials

Fig.8 Current time transient curve for the electrodeposition of silver from alkaline DMH bath

Fig.9 The non-dimensional polts of (I/I_m)²~ $t / t m$

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