Preparation of High-tin Bronze Corrosion-resistant Coating by Potentiostatic Pulse Electrodeposition

doi:10.11902/1005.4537.2019.087

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 585-591 DOI: 10.11902/1005.4537.2019.087

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Preparation of High-tin Bronze Corrosion-resistant Coating by Potentiostatic Pulse Electrodeposition

BAO Ren¹, ZHOU Genshu¹(

), LI Hongwei²

1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
2. Equipment Maintenance Center, Shenhua Shenmu Coal Group Company, Shenmu 719315, China

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Abstract

Aiming at the proposed potentiostatic pulse electrodeposition of Cu-Sn alloy, the influence of process parameters on the composition, grain size and corrosion resistance of prepared coatings is studied. The morphology, grain size, chemical composition and corrosion behavior of the Cu-Sn coatings electrodeposited by potentiostatic pulse technology or constant-current pulse technology are characterized by means of scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS) and electrochemical workstation. It is found that potentiostatic pulse process of Cu-Sn electroplating with the duty ratio of 33% and potential of 3 V could reduce the dissolution probability of the plating layer and maintained the complex ion migration and deposition driving force, so that the high-tin bronze coating can be obtained on parts of different size. The grain size of the coating on the part with surface area 78.5 mm² is less than 100 nm. Under the same initial conditions, the electrodeposition rate of the potentiostatic pulse technology is faster than that of the constant current pulse technology, besides the plated alloy presents much better composition uniformity and the formed coating possesses only few of pores and crystallite clusters, therefore the coating exhibits corrosion resistance 2 times higher than that made by constant-current pulse. Compared with the constant current pulse technology, the potentiostatic pulse electrodeposition is beneficial to improve the quality and corrosion resistance of copper-tin plating and which may facilitate the introduction of processing automation or composition control for complex parts as well.

Key words: high-tin bronze potentiostatic pulse constant-current pulse electrodeposition corrosion resistance

Received: 20 June 2019

ZTFLH:

TQ153.2

Fund: Science and Technology Innovation Program of Xi'an(201805064ZD15CG48)

Corresponding Authors: ZHOU Genshu E-mail: zhougs@xjtu.edu.cn

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Cite this article:

BAO Ren, ZHOU Genshu, LI Hongwei. Preparation of High-tin Bronze Corrosion-resistant Coating by Potentiostatic Pulse Electrodeposition. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 585-591.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.087 OR https://www.jcscp.org/EN/Y2020/V40/I6/585

Fig.1 Processes diagrams of constant-current (a) and potentiostatic (b) pulse electrodepositions

Fig.2 SEM images of the coatings electrodeposited on sample A (a, b) and sample B (c, d) in the modes of constant-current pulse (a, c) and potentiostatic pulse (b, d)

Fig.3 EDS analysis results of the coatings electrodeposited on sample A (a, b) and sample B (c, d) in the modes of constant-current pulse (a, c) and potentiostatic pulse (b, d)

Table 1 Ccontents of Sn in the coatings electrodeposited on two samples in two pulse modes

Table 2 Thicknesses of the coatings electrodeposited on two samples with different cross-sectional areas in two pulse modes

Fig.4 Cross-sectional images of the coatings electrode-posited on sample B in the modes of constant-current pulse (a) and potentiostatic pulse (b)

Fig.5 Bode plots of sample B without and with the coatings deposited in different pulse modes

Fig.6 Bode plots of sample A without and with the coatings electrodeposited in different pulse modes

Fig.7 Open circuit potential of the coating electrodeposited by potentiostatic pulse

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