Structure, mechanical properties and corrosion resistance of amorphous Ti-Cr-O coatings
By Bahrami, Amin; Delgado, Arturo; Onofre, Cesar; Muhl, Stephen; Rodil, Sandra E.
Published in Surface and Coatings Technology
2019
Abstract
In this work, titanium?chromium oxide (TCO) coatings were investigated aiming to produce a functional hard-corrosion resistance coating based on the well-known properties of the individual TiO2 and Cr2O3 oxides. The TCO coatings were deposited on low carbon steel and Si substrates using reactive magnetron sputtering from a crystalline TiCr target. Amorphous TCO coatings with increasing oxygen content up to 65 at.% were obtained by rising the oxygen flow rate during the reactive deposition. Coatings deposited using constant O2 flow rate of 1.5 (6.2% of oxygen) were selected to evaluate the corrosion resistance, hardness and to determine the effect of annealing treatments. Electrochemical evaluation was done using impedance spectroscopy and potentiodynamic polarization in 3.5 wt% NaCl solutions showing a significant protection efficiency. The coatings were heat treated at different temperatures (200, 400, 500, 600 and 800
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