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Effect of fluoride film on bonding of electroless nickel coating with magnesium alloys

Abstract Theoretical calculation and X-ray photoelectron spectroscopy (XPS) analysis show that the fluoride layer formed during activation in hydrogen fluoride acid dissolves little in an electroless plating bath. The adhesive characteristics of a nickel coating with the magnesium alloys matrix were studied by means of the analysis of the initially deposited nickel and the cross section of the coating as well as by examining the fracture surface using Transmission electron microscopy (TEM), XPS and Auger spectroscopy (SAM). It is shown that there exists a compound mixture layer above the matrix surface between the magnesium and the nickel coating, which consists of fluoride, nickel and the composition of the plating bath. Fracture usually occurs in the mixture layer, i.e. the weakest link for the adhesion of nickel coating on the magnesium alloys.