Electroless deposition of high phosphorus Ni-P, Ni-Al2O3-P, Ni-Cu-P coatings and their corrosion behavior in 0.5M Na2SO4 solution
Keywords:Ni-P Polyalloy, Potentiodynamic polarization, Na2SO4 Solution, Heat treatment, Ni3P Phase
Addition of other elements in Ni-P matrix is common practice for the improvement of electroless nickel depositâ€™s characteristics. Copper improves corrosion resistance, hardness and other properties of electroless nickel coatings. In this work Ni-P, Ni-Cu-P and Ni-Al2O3-P coatings were deposited on mild steel. Coatings thickness and composition were measured using elcometer and EDX respectively. Anti-corrosion properties of coatings were investigated in 0.5M Na2SO4 solution. The results showed that the corrosion resistance of Ni-Cu-P coatings in Na2SO4 solution was superior to Ni-P and Ni-Al2O3-P coatings. Coated samples were heat treated at 400 0C for 1 hr and hardness of as plated and heat treated samples was compared. The improvement in the hardness of coatings after heat treatment can be explained by the precipitation of nickel phosphide Ni3P.
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