Corrosion and Wear performances analysis of PVD CrMoN/Cr Coatings

Barnali Biswas,Corrine Nouveau,Kheireddine Bouzid,Nasser Eddine Beliardouh,Rim Lamari

doi:10.30544/640

Abstract

Tools coated CrN based alloys are currently used in several industries for machining and manufacturing, but present severe wear, limiting their service life. Seeking an alternative, three CrMoN monolayers (~1µm in thickness) coatings with varying in the Mo percentage content were elaborated using the RF magnetron co-sputtering method. These coatings were evaluated and compared with the alloy currently used (CrN) by electrochemical tests in NaCl solution (stationary and no stationary method) and sliding wear tests (ball-on-disc configuration) performed at room temperature. The results indicate that the samples coated with CrMoN presented better performance against wear and corrosion than the uncoated sample. Among the coatings, the labeled C1 (27 % Mo) showed the best corrosion resistance as it presents a positive corrosion potential Ecorr. However, the best wear resistance (lowest coefficient of friction) was shown by coating labeled C4 (33 % Mo). All of the tested specimens underwent abrasive wear in addition to adhesive wear.

Highlights

Nowadays, surfaces are of great importance in the conception and design of new materials
The morphology and the thickness of the obtained layers were analyzed by SEM (JEOL JSM-5900-LV microscope) equipped with an energy dispersive spectroscopy (EDS)
The increase in corrosion performances was attributed to the incorporation of Mo, which makes the surface of Mo-doped currently used (CrN) coating is denser and more homogeneous than CrN coating [14]

Summary

Introduction

Surfaces are of great importance in the conception and design of new materials. In this modern world, materials face new situations every day, and the surface of the material represents the pathway through which material interacts with the environment. Among several techniques for surface coating, physical vapor deposition (PVD) is one of the principal methods used to coat a wide range of materials. These PVD coatings are well suited for various applications in a wide variety of environments. There exist broad varieties of tool coatings for nearly every demand

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