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Electrochemical investigation of the stability and corrosion resistance of boron phosphide films prepared by PECVD

The corrosion susceptibility of Boron phosphide films prepared by PECVD, was studied in saturated saline solution as a function of phosphine flow rate during deposition. The chemical composition of the Boron phosphide films was determined by x-ray photoelectron spectroscopy (XPS) analysis. The investigation involved open circuit potential measurements (OCP) over several hours, potentiodynamic polarisation and electrochemical impedance Spectroscopy (EIS) measurements. The corrosion rate of the Boron Phosphide films was found to vary with changes in the phosphine flow rate during deposition. The results of our investigation also showed that Boron phosphide coated stainless steel plates had superior corrosion resistance, when compared to bare uncoated stainless steel plates. This opens up the potential for the application of Boron Phosphide films as a protective coating to improve the corrosion resistance of metals and alloys for various engineering applications.