Studying the influence of nano-Al2O3 particles on morphology and corrosion improvement of ni-9%p electroless coatings

A possibility to increase materials´ performance for different applications is to protect them by coatings. Electroless nickel deposition represents an alternative method to obtain coatings on various substrates. Advancement in electroless Ni-P deposition is the codeposition of solid particles within coatings. By this method, composite layers with very good characteristics for specific applications can be produced. Ni-9%P/nano-Al₂O₃ composite coatings were deposited by electroless plating method, while their morphology and properties were examined via scanning electron microscopy, energy dispersive X-ray spectroscopy and microhardness tests. Electrochemical impedance spectroscopy and polarisation method was used to analyse the corrosion resistance of the coatings. The results showed that the addition of nano-Al₂O₃ particles improved the corrosion resistance and mechanical properties of electroless Ni-P coatings.