Effect of Cu-/Ag-activation on Growth and Corrosion Resistance of Electroless Plated Ni-film on Plasma Electrolytic Oxidation Coating

doi:10.11902/1005.4537.2021.151

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 573-582 DOI: 10.11902/1005.4537.2021.151

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Effect of Cu-/Ag-activation on Growth and Corrosion Resistance of Electroless Plated Ni-film on Plasma Electrolytic Oxidation Coating

TIAN Weiping¹, GUO Liangshuai²^,³, WANG Yuhang³, ZHOU Peng³, ZHANG Tao³(

)

^1.Qingan Group Co. Ltd., Xi'an 710077, China
^2.Tianjin Aerospace Long March Rocket Manufacturing Co. Ltd., Tianjin 300462, China
^3.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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Abstract

The plasma electrolytic oxidation (PEO) coating is a ceramic-like coating without catalytic activity of its surface, thus which should be activated with noble metal Pd before an electroless nickel (EN) plating process can be conducted. To replace the expensive Pd-activation process, Cu-activation and Ag-activation methods were developed. A field emission-scanning electron microscopy was employed to characterize the surface morphology and cross-section morphology of EN films on the Cu- and Ag-activated PEO coatings. In comparison with the Cu-activated PEO coating, a thicker, compact and more uniform EN layer film was formed on the Ag-activated PEO coating. Moreover, the results of electrochemical tests shown that the EN film plated on Ag-activated coating presents more or less the same corrosion resistance as the EN film plated on Pd-activated PEO coating, and better than the EN film plated on Cu-activated PEO coating. Hence, the Ag-activation method significantly reduce the cost, and best of all, it guaranteed the corrosion resistance of the composite coating.

Key words: AZ91D Mg alloy Cu/Ag activation plasma electrolytic oxidation electroless plating composite coating

Received: 29 June 2021

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51771050);National Natural Science Foundation of China(51531007);Liaoning Revitalization Talents Program(XLYC2002071)

Corresponding Authors: ZHANG Tao E-mail: zhangtao@mail.neu.edu.cn

About author: ZHANG Tao, E-mail: zhangtao@mail.neu.edu.cn

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Cite this article:

TIAN Weiping, GUO Liangshuai, WANG Yuhang, ZHOU Peng, ZHANG Tao. Effect of Cu-/Ag-activation on Growth and Corrosion Resistance of Electroless Plated Ni-film on Plasma Electrolytic Oxidation Coating. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 573-582.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.151 OR https://www.jcscp.org/EN/Y2022/V42/I4/573

Fig.1 Macro image (a), SEM surface morphologies (b, c) and SEM cross-section morphology (d) of PEO coating

Fig.2 Macro images (a) and SEM images (b, c) of PEO coating after Cu-sensitized treatment and Macro images (d) and SEM images (e, f) of PEO coating after Cu-activation treatment

Table 1 Composition of the coatings by EDS (mass fraction / %)

Fig.3 Elements distribution of PEO coating after Cu-activation treatment

Fig.4 Macro images (a) and SEM images (b, c) of PEO coating after Ag-sensitized treatment, and Macro images (d) and SEM images (e, f) of PEO coating after Ag-activation treatment

Fig.5 Elements distribution of PEO coating after Ag-activation treatment

Fig.6 XRD spectrum of PEO coating and PEO coating with various activation treatments

Fig.7 XPS spectrum of PEO coating with Cu-sensitized (a), Cu-activation (b), Ag-sensitized (c) and Ag-activation (b)

Fig.8 SEM images of PEO-Cu-EN (a), PEO-Ag-EN (b) and PEO-Pd-EN (c) coatings surface morphology after 3 min (a1-c1), 10 min (a2-c2), 30 min (a3-c3) dipping process and SEM image of PEO-EN coating cross-section morphology after 30 min dipping process (a4-c4)

Fig.9 XRD spectrum of the surface of the different composite coatings

Fig.10 Potentiodynamic polarization curves of Mg alloy AZ91D and its coatings

Table 2 Fitted electrochemical parameters of polarization curves in Fig.11

Fig.11 Nyquist (a), Bode (b, c) plots of Mg alloy AZ91D and its coatings

Fig.12 Equivalent circuits used to fit the EIS data: (a) AZ91D, (b) PEO-Cu/Ag/Pd-EN

Table 3 Fitted parameters of the EIS data

Fig.13 Macro images of the PEO-Cu-EN (a) and PEO-Ag-EN (b) during salt spray test

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