The influence of pulse parameters on Zn-Ni alloy coatings plated on AZ91 magnesium alloy |
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| Authors: | Y F Jiang X W Guo C Q Zhai Y P Zhu W J Ding |
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| Affiliation: | 1. National Engineering Research Center of Light Alloys Net Forming, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, P. R. China.sjtujyfool@sohu.com;3. National Engineering Research Center of Light Alloys Net Forming, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, P. R. China. |
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| Abstract: | The influence of pulse parameters on zinc-nickel coatings plated on AZ91 magnesium alloy is investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The particles of zinc-nickel alloy plated on AZ91 magnesium alloy become smaller and the surface roughness decreases with the increase of current density and frequency. However, long plating times and a high ratio of ton/toff have decremental effects on the particles and surface roughness. The contents of crystal phases of zinc-nickel alloy coatings are higher under pulse current deposition than under direct current. The frequency, current density, plating time and ratio of ton/toff have different impacts on the thickness and Ni content of zinc-nickel coatings. |
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| Keywords: | magnesium alloys zinc-nickel alloy coatings pulse current phase morphology |
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