Corrosion and Wear Behavior of CAE Deposited CrN-PVD Coatings

Abstract

Corrosion and wear resistance of Cathodic Arc Evaporation (CAE) CrN coatings deposited on a tool steel were investigated considering the effect of the number of layers (mono or double) and the influence of defects. The CrN coatings were characterized for mechanical (scratch, nanoindentation test), corrosion behavior (polarizarion tests) and tribological properties (pin-on-disk tests). Scanning Electron Microscope analyses on samples before and after the tests were also made in order to identify the type of the defects and the role they play in the coating damage. Monolayer coating shows a good wear behavior with a stable and low friction coefficient, but its corrosion performance is poor. On the contrary, the presence of an interface into the double layer improves the corrosion resistance, but it is a weak point for the coating delamination during wear tests.

Tribological and corrosion behavior of CrN coatings: Roles of substrate and deposition defects

“…3). Due to the applied load during the wear test the interface between the two layers locally collapsed Previous studies evidenced the same behavior also in the case of CAE mono and double layer coatings [20]. Fig.…”

Investigation on Microblasting Applied to CrN Coatings

“…As known, in fact, the presence of a ceramic layer increases the hardness of the surface and reduces the friction coefficient [2]. Additionally, due to the chemical stability of the deposited material, the corrosion of the substrate is strongly reduced [1,2].…”

“…Physical Vapor Deposition (PVD) coatings are widely used to increase the wear and corrosion resistance of many substrates [1,2] and for different applications [3,4]. As known, in fact, the presence of a ceramic layer increases the hardness of the surface and reduces the friction coefficient [2].…”

“…Different authors have already demonstrated that the corrosion resistance of a coated part is influenced by the presence of defects formed during the deposition process, such as pores or droplets [5][6][7]. It follows that the removal of coating defects, without affecting other coating properties, can be an interesting method to enhance corrosion resistance [1].…”