Corrosion behavior of TiN-coated cutting carbide tools

Article type: Research Article

Authors: Belhamra, Nadjette | Chala, Abdelouahed

Affiliations: Physic Laboratory of Thin Films and Applications LPCMA, University of Biskra, Biskra, Algeria

Note: [] Corresponding author: Nadjette Belhamra, Physic Laboratory of Thin Films and Applications LPCMA, University of Biskra, BP145 RP, 07000 Biskra, Algeria. E-mail: belhamra@windowslive.com

Abstract: Hard coatings produced by physical vapor deposition (PVD) have been widely used as a thin protective film. The coatings can provide wear resistance, corrosion resistance, can be decorative and act as a diffusion barrier. Among the commercially available coatings, TiN (titanium nitride) is probably the most commonly used industrially for machining tools. The aim of our work is to study corrosion resistance of TiN coated carbide tools such as WC–Co (tungsten carbide with cobalt). The corrosion behavior of TiN coating was examined in naturally aerated aqueous 0.5 M NaCl solution. The study was performed by using potentiodynamic polarization (PP) and electrochemical impedance spectroscopy measurements (EIS), complemented with scanning electron (SEM) microscopy. The experimental impedance data are in good agreement with the polarization experiments. The TiN coating improves the corrosion resistance of carbide tools in NaCl solution.

Keywords: TiN, carbide tools, corrosion, potentiondynamic polarization, electrochemical impedance spectroscopy

DOI: 10.3233/MGC-140123

Journal: Main Group Chemistry, vol. 13, no. 1, pp. 65-71, 2014