An Electrochemical Study of the Corrosion Resistance of Niobium-Aluminum Carbonitride Coating Produced on Steels by Thermo-Reactive Diffusion Technique

Abstract

Thermo-reactive diffusion/deposition technique is an alternative to physical vapor deposition and chemical vapor deposition techniques for obtaining wear and corrosion resistant coatings on steel parts. In this work, thermo-reactive diffusion/deposition technique was used to produce niobium aluminum carbonitride-based coatings on AISI M2 steel. Characterization of the coatings was done by X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy. The corrosion resistance of the produced coatings was investigated by using potentiodynamic polarization in a solution of 0.5 M NaCl. Hard, compact and adherent coatings, mainly consisting of NbC and NbN phases were obtained. The corrosion behavior of the samples was investigation by potentiodynamic polarization measurements.

Investigation of Al-V coatings produced by the thermo-reactive diffusion method

“…The use of AI as an additive to thermo-reactive diffusion coatings has previously been studied [10,27,29]. However, existing studies have focused on the formation of thermo-reactive diffusion coatings on steel substrates.…”

“…In addition, most authors have studied the effect not of pure aluminium, but in conjunction with other additives. For example, aluminium Al with niobium Nb [29] or aluminium Al with chromium Cr [10].…”