Preparation and Electrochemical Corrosion Behavior of Electroless Plated Ni-Cr-P Alloy Coating

doi:10.11902/1005.4537.2018.178

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (3): 273-280 DOI: 10.11902/1005.4537.2018.178

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Preparation and Electrochemical Corrosion Behavior of Electroless Plated Ni-Cr-P Alloy Coating

SUN Shuo(

), YANG Jie, QIAN Xinzhu, CHANG Renli

College of Science, Shenyang University of Technology, Shenyang 110870, China

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Abstract

Ni-Cr-P alloy coatings on Q235 steel were prepared by electroless plating. The effect of CrCl₃, C₃H₆O₃, C₂H₅NO₂ and K₂C₂O₄ on the structure, composition and corrosion resistance of the prepared coatings was investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that with the increase of concentration of lactic acid, glycine, and potassium oxalate, the deposition rate was decreased continuously. In the contrast, the deposition rate was increased continuously with the increase of concentration of chromium chloride. The Ni-Cr-P coatings presented a surface morphology of cauliflower-like microstructures composed of a mixture of polycrystalline and amorphous. Notably, the anticorrosion performance of the Ni-Cr-P coatings were found to be much better than that of the Ni-P coatings.

Key words: electroless Ni-Cr-P alloy coating complexing agent AC impedance polarization curve

Received: 27 November 2018

ZTFLH:

TD123

Fund: National R＆D Infrastructure and Facility Development Program of China(2005DKA10400-15-Z04)

Corresponding Authors: SUN Shuo E-mail: sunshuo@sut.edu.cn

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Cite this article:

SUN Shuo, YANG Jie, QIAN Xinzhu, CHANG Renli. Preparation and Electrochemical Corrosion Behavior of Electroless Plated Ni-Cr-P Alloy Coating. Journal of Chinese Society for Corrosion and protection, 2020, 40(3): 273-280.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.178 OR https://www.jcscp.org/EN/Y2020/V40/I3/273

Fig.1 Effects of the concentration of chromium chloride on the deposition rate of Ni-Cr-P plating and the content of Cr

Fig.2 Potentiodynamic polarization curves (a) and EIS (b) of Ni-Cr-P plating in 0.5 mol·L^-1 H₂SO₄ solution with the different concentrations of CrCl₃

Table 1 Fitting values of potentiodynamic polarization curves and EIS for Ni-Cr-P plating in 0.5 mol·L^-1 H₂SO₄ solution

Fig.3 Effects of the concentration of lactic acid on the deposition rate of Ni-Cr-P plating and the content of Cr

Fig.4 Potentiodynamic polarization curves (a) and EIS (b) of Ni-Cr-P plating in 0.5 mol·L^-1 H₂SO₄ solution withthe different concentrations of C₃H₆O₃

Table 2 Fitting values of potentiodynamic polarization curves and EIS for Ni-Cr-P alloy in 0.5 mol·L^-1 H₂SO₄ solution

Fig.5 Effects of the concentration of glycine on the deposition rate of Ni-Cr-P plating and the content of Cr

Fig.6 Potentiodynamic polarization curves (a) and EIS (b) of Ni-Cr-P plating in 0.5 mol·L^-1 H₂SO₄ solution with the different concentrations of C₂H₅NO₂

Table 3 Fitting values of potentiodynamic polarization curves and EIS for Ni-Cr-P alloy in 0.5 mol·L^-1 H₂SO₄ solution

Fig.7 Effects of the concentration of potassium oxalate on the deposition rate of Ni-Cr-P plating and the content of Cr

Fig.8 Potentiodynamic polarization curves (a) and EIS (b) of Ni-Cr-P plating in 0.5 mol·L^-1 H₂SO₄ solution with the different concentrations of K₂C₂O₄

Table 4 Fitting values of potentiodynamic polarization curves and EIS for Ni-Cr-P alloy in 0.5 mol·L^-1 H₂SO₄ solution

Fig.9 Potentiodynamic polarization curves (a) and EIS (b) of Ni-P coating and Ni-Cr-P coating in 0.5 mol·L^-1 H₂SO₄ solution

Table 5 Fitting values of potentiodynamic polarization curves and EIS for Ni-P coating and Ni-Cr-P coating in 0.5 mol·L^-1 H₂SO₄ solution

Fig.10 SEM image of Ni-Cr-P alloy coating

Fig.11 XRD pattern of Ni-Cr-P alloy coating

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