Abstract
Ni-B coatings have been deposited directly on commercial purity magnesium and AZ91D magnesium alloy by a chromium-free electroless process and characterized using scanning electron microscopy, glow discharge optical emission spectroscopy, gravimetric measurements and, for corrosion evaluation, hydrogen evolution. The surfaces of the coatings reveal a typical cauliflower-type appearance and form at a rate of ~8 to 13μm/h. The nickel and boron contents of the coatings are relatively uniform across the whole thickness. The addition of NH 4HF 2 to the electroless bath improves the corrosion resistance provided by the coatings during immersion of coated substrates in sodium chloride solution. © 2011 Elsevier B.V.
Original language | English |
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Pages (from-to) | 3088-3093 |
Number of pages | 5 |
Journal | Surface and Coatings Technology |
Volume | 206 |
Issue number | 13 |
DOIs | |
Publication status | Published - 25 Feb 2012 |
Keywords
- Alloy
- Electroless
- Magnesium
- Ni-B