TITLE:
Characterization and Comparison of Corrosion Behavior of Nanostructured TiAlN and AlCrN Coatings on Superfer 800H (INCOLOY 800 H) Substrate
AUTHORS:
Vikas Chawla, D. Puri, S. Prakasha, Amita Chawla, Buta Singh Sidhu
KEYWORDS:
Polarization, Tafel slope, Hard coatings, Corrosion, Physical vapour deposition.
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.8 No.9,
September
20,
2009
ABSTRACT: Nitrided coatings have been used to increase hardness and to improve the wear and corrosion
resistance of structural materials. In this work, TiAlN and AlCrN coatings were deposited on
Superfer 800H (INCOLOY 800 H) substrate by using Balzer’s rapid coating system (RCS)
machine (make Oerlikon Balzers, Swiss) under a reactive nitrogen atmosphere. The coated
samples were subjected to optical microscopy (OM), XRD analysis, Field emission scanning
electron microscope (FESEM with EDAX attachment), AFM analysis. The corrosion resistance
of the substrate, TiAlN-coated and AlCrN-coated samples in a 3 wt% NaCl solution was
evaluated and compared by electrochemical potentiodynamic polarization method. It was found
that the AlCrN-coating exhibited better corrosion resistance.