Corrosion Performance of Annealed Electroless Ni-B Coatings on Mild Steel
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Abstract
The coating of Ni-B on mild steel substrate using electroless plating and corrosion performance after annealing at temperatures of varied levels for an hour was researched. The result showed the electroless Ni-B coating was amorphous while coated and also after annealing at 400°C for about one-hour, crystalline nickel and borides of nickel were formed. The corrosion test was carried out using the as-coated and annealed samples in the electro chemical analyser. The sodium chloride solution of 3.5 wt. % was used as a medium of corrosion for the test. The micro strain and crystallite size were calculated from the XRD as a result of which, the annealing temperature raised the rate of corrosion on the coating.
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