Electrochemical Corrosion of Ni-P-BN(h)-Al2O3 Composite Coating Deposited by Spray Electrodeposition

doi:10.11902/1005.4537.2019.223

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (1): 57-62 DOI: 10.11902/1005.4537.2019.223

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Electrochemical Corrosion of Ni-P-BN(h)-Al₂O₃ Composite Coating Deposited by Spray Electrodeposition

YANG Yinchu¹,FU Xiuqing^1,²(

),LIU Lin¹,MA Wenke¹,SHEN Moqi¹

1. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
2. Key Laboratory of Intelligence Agricultural Equipment of Jiangsu Province，Nanjing 210031, China

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Abstract

Ni-P-BN(h)-Al₂O₃composite coating was prepared on the surface of 45 steel parts by spray electrodeposition technology. The surface morphology of the_{composite coating was characterized by scanning electron microscopy (SEM). The corrosion resistance of the composite coating was studied by electrochemical workstation. Results showed that with the increase of the applied voltage within arrange of 22~28 V, the corrosion resistance of the composite coating was enhanced at first and then decreased. Among others, the composite coating deposited at voltage of 25 V presented the best corrosion resistance. While the corrosion resistance of the composite coating was enhanced gradually with the increase of the gap from 1.6 mm to 2.0 mm between injection nozzle to the workpiece, and the composite coating had the best corrosion resistance when prepared with the gap of 2.0 mm.}

Key words: jet-electrodeposition Ni-P-BN(h)-Al₂O₃ composite coating corrosion resistance

Received: 07 May 2019

ZTFLH:

TG174.44

Fund: National Innovation Training Program for College Students(20181037088);Nanjing Agricultural University Undergraduate Innovation Project Training Plan(1830B18)

Corresponding Authors: Xiuqing FU E-mail: fuxiuqing@njau.edu.cn

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	Yinchu YANG
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	Wenke MA
	Moqi SHEN

Cite this article:

YANG Yinchu,FU Xiuqing,LIU Lin,MA Wenke,SHEN Moqi. Electrochemical Corrosion of Ni-P-BN(h)-Al₂O₃ Composite Coating Deposited by Spray Electrodeposition. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 57-62.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.223 OR https://www.jcscp.org/EN/Y2020/V40/I1/57

Fig.1 Spray-electrodeposition equipment

Fig.2 Surface morphologies of composite coatings with different injection voltages and different injection gaps: (a) 22 V, 1.6 mm; (b) 25 V, 1.6 mm; (c) 28 V, 1.6 mm; (d) 25 V, 1.8 mm; (e) 25 V, 2.0 mm

Table 1 Polarization curve analysis results of Ni-P-BN(h)-Al₂O₃ composite coating

Fig.3 Tafel curves of composite coatings with different injection voltages when the injection gap is 1.6 mm

Fig.4 Tafel curves of composite coatings with injection voltage of 25 V under different injection clearance conditions

Fig.5 Nyquist plot of impedance spectra at different injection voltages when the jet gap was 1.6 mm

Fig.6 Nyquist plot of impedance spectra for different jet clearances at a jet voltage of 25 V

Fig.7 Phase angle plot with different parameters of Ni-P-BN(h)-Al₂O₃composite coating

Fig.8 Equivalent circuit for AC impedance spectroscopy of passive film

Table 2 Values of the elements in the equivalent circuit for AC impedance spectroscopy of passive films formed on 3 specimens

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