Journal
SURFACE & COATINGS TECHNOLOGY
Volume 205, Issue 23-24, Pages 5454-5463Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.06.014
Keywords
Low carbon steel; Corrosion; Titanium nitride; Titanium boronitride; Impedance spectroscopy
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Titanium nitride (TiN), titanium boride (TiB(2)) and titanium boronitride (TiBN) with different boron content were deposited on low carbon steel by Chemical Vapor Deposition (CVD) technique. The CVD was performed at a temperature of 900 degrees C and a reduced pressure of 600 mbar. To elucidate the corrosion protection mechanisms of the coatings, their chemical composition was studied by XPS, the morphology by SEM and the crystallographic structure by XRD. The corrosion behavior was evaluated in simulated soil solution (SSS) by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The EIS experimental data were analyzed by an equivalent circuit model. The results demonstrate that titanium boronitride coatings provide excellent corrosion protection to the low carbon steel, which is related to the high chemical stability as well as to their favorable microstructure. (C) 2011 Elsevier B.V. All rights reserved.
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