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The Effect of Adding Corrosion Inhibitors into an Electroless Nickel Plating Bath for Magnesium Alloys

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Abstract

In this work, corrosion inhibitors were added into an electroless nickel plating bath to realize nickel-phosphorus (Ni-P) coating deposition on magnesium alloy directly. The performance of five corrosion inhibitors was evaluated by inhibition efficiency. The results showed that only ammonium hydrogen fluoride (NH4HF2) and ammonium molybdate ((NH4)2MoO4) could be used as corrosion inhibitors for magnesium alloy in the bath. Moreover, compounding NH4HF2 and (NH4)2MoO4, the optimal concentrations were both at 1.5 ~ 2%. The deposition process of Ni-P coating was observed by using a scanning electron microscope (SEM). It showed corrosion inhibitors inhibited undesired dissolution of magnesium substrate during the electroless plating process. In addition, SEM observation indicated that the corrosion inhibition reaction and the Ni2+ replacement reaction were competitive at the initial deposition time. Both electrochemical analysis and thermal shock test revealed that the Ni-P coating exhibited excellent corrosion resistance and adhesion properties in protecting the magnesium alloy.

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Acknowledgments

The authors gratefully acknowledge scientific and technological research program of Chongqing municipal education commission (KJ1501116), the foundation of the talent introduction Project No. R2014CJ05 and Y2015XC26 of Chongqing University of Arts and Sciences, basic and frontier research program of Chongqing municipality (cstc2016jcyjA1959, cstc2015jcyjA90020, cstc2013jcyjA50036) for providing support for this work.

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Authors and Affiliations

  1. Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Chongqing, 402160, People’s Republic of China

    Rong Hu, Yongyao Su, Hongdong Liu, Jiang Cheng & Xin Yang

  2. School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang, 110159, People’s Republic of China

    Zhongcai Shao

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  1. Rong Hu
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  2. Yongyao Su
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  3. Hongdong Liu
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  4. Jiang Cheng
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  5. Xin Yang
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  6. Zhongcai Shao
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Correspondence to Hongdong Liu or Zhongcai Shao.

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Hu, R., Su, Y., Liu, H. et al. The Effect of Adding Corrosion Inhibitors into an Electroless Nickel Plating Bath for Magnesium Alloys. J. of Materi Eng and Perform 25, 4530–4536 (2016). https://doi.org/10.1007/s11665-016-2265-3

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  • DOI: https://doi.org/10.1007/s11665-016-2265-3

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