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Evidence of Electrochemical Resistance on Ternary V-C-N Layers

Abstract:

In this research, vanadium carbo-nitride (VCN) coatings were synthesized via physical vapor deposition with the aim to determinate the electrochemical behavior of the VCN layers on industrial steel substrates. The VCN coatings, deposited at various negative bias voltage were characterized by X-ray diffraction (XRD), exhibiting the crystallography orientations corresponding to a mix of VCN, VC and VN phases while the X-ray photoelectron spectroscopy (XPS) measurements were used to determinate the chemical composition of the metallic carbon-nitride materials. By using electrochemical impedance spectroscopy (EIS) and Tafel curves, it was possible to estimate the electrochemical behavior of the VCN coatings in a sodium chloride (NaCl) solution. Moreover, scanning electron microscopy (SEM) was performed to analyze morphological and chemical surfaces changes on the VCN layer due to the reaction in NaCl/VCN/steel surface interface. The electrochemical behavior of the VCN coatings in relation to the uncoated AISI 8620 steel showed a reduction of 98% in the corrosion rate, indicating that the applied VCN coatings may be a promising material for industrial applications.