Singh, Charu and Tiwari, S K and Singh, R (2019) Exploring environment friendly nickel electrodeposition on AZ91 magnesium alloy: Effect of prior surface treatments and temperature of the bath on corrosion behaviour. Corrosion Science, 151 . pp. 1-19.
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Abstract
The nickel electroplating of AZ91 magnesium alloy was explored with and without employing surface pretreatment. The plating process refrained from using hazardous elements namely fluoride, chromium and copper or zinc undercoat. The electroplating was achieved at 25-70 degrees C and 25 mA cm(-2) after applying surface pre-treatments and Ni-P interlayer. Electrochemical and salt spray tests revealed large enhancement in corrosion resistance of 15 mu m thick coating obtained at 70 degrees C bath temperature. The pretreatment involved phosphoric acid followed by NaOH produced superior coating to nickel carbonate followed by carbonate silicate bath, which is explained based on the porosity and hydrogen activity on the surface.
| Item Type: | Article |
|---|---|
| Official URL/DOI: | https://doi.org/10.1016/j.corsci.2019.02.004 |
| Uncontrolled Keywords: | Magnesium alloy; Electrodeposited film; Metal coating; Polarization; EIS; Anodic dissolution; Corrosion;Protective copper/nickel deposit; zinc immersion; ni; pretreatment; hydrogen; microstructure; coatings; copper |
| Divisions: | Material Science and Technology |
| ID Code: | 7966 |
| Deposited By: | Sahu A K |
| Deposited On: | 27 Sep 2019 12:40 |
| Last Modified: | 27 Sep 2019 12:40 |
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