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Influence of Substrate Bias Voltage on Corrosion and Wear Behavior of Physical Vapor Deposition CrN Coatings

Article dans une revue avec comité de lecture
Author
AOUADI, Khalil
TLILI, Brahim
300862 Ecole Nationale d'Ingénieurs de Tunis [ENIT]
NOUVEAU, Corinne
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
BESNARD, Aurélien
CHAFRA, Moez
302967 Institut préparatoire aux études scientifiques et techniques [La Marsa] [IPEST]
SOULI, Rania
300862 Ecole Nationale d'Ingénieurs de Tunis [ENIT]

URI
http://hdl.handle.net/10985/15276
DOI
10.1007/s11665-019-04033-y
Date
2019
Journal
Journal of Materials Engineering and Performance

Abstract

The objective of the present paper is to study the influence of the substrate bias voltage on the microstructure, composition, deposition rate, tribological and corrosion properties of CrN coatings obtained by DC magnetron sputtering on 90CrMoV8 steel and Si (100) substrates. The substrate bias voltage varied from 0 to − 700 V. The deposited films were characterized by SEM, XRD and potentiodynamic polarization. The wear behavior and coefficient of friction were determined and investigated after rotative tribometer tests. The results indicated that the substrate bias voltage considerably affected the intrinsic properties of the CrN films. Indeed, it significantly influenced the grain size and the root-mean-squared roughness which varied from 20 to 29 nm, and from 9 to 19 nm, respectively, when polarization changed from 0 to − 700 V. All the CrN coatings have a dense columnar structure and are well crystallized according to the XRD analyses. Nevertheless, it has been shown that the peaks intensity decreased by increasing the substrate bias voltage. By applying a substrate bias voltage, it was obvious that the friction behavior was enhanced, and the wear volume was decreased. Finally, the CrN coating obtained under a substrate bias voltage of − 500 V presented the best corrosion resistance and wear resistance probably due to its dense microstructure.

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