DEPOSITING Ni–Co–P ALLOY COATING ON AISI316 STEEL AND ANALYZING ITS PROPERTIES

After appropriately preparing the surface of AISI316 steel, the Ni–Co–P coating layer was deposited on the substrate using the electroless method using baths with different mole ratios of CoSO 4 /NiSO[Formula: see text]. Coating rate, weight percentage of the alloy elements, corrosion rate and coating layer hardness were studied in the achieved coating layers. The coating rate of the Ni–Co–P coating layer is a function of the mole ratio of CoSO 4 /CoSO[Formula: see text], sodium hypophosphite concentration, bath temperature, bath pH and plating time. The electroless deposits studied in this paper are in crystal form. The XRD pattern of the Ni–Co–P deposits shows the peaks related to Ni-fcc and tetragonal Ni[Formula: see text]P 5 . X-ray diffraction pattern confirms the formation of the Ni 3 P phase during annealing for 1[Formula: see text]h at 400 ∘ C.