Journal
VACUUM
Volume 86, Issue 9, Pages 1393-1401Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2012.01.016
Keywords
Corrosion; CrN/Cr; Multilayers; Sputtering
Funding
- Banco de la Republica de Colombia [201010011960]
- la DIB-Universidad Nacional de Colombia
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This paper reports the results of the influence of bilayer period (A) and total thickness (f) on the corrosion resistance of magnetron-sputtered CrN/Cr multilayers. Corrosion tests were carried out by potentiodynamic polarization with 0.5 M H2SO4 + 0.05 M KSCN solution and electrochemical impedance spectroscopy (EIS) with 3% NaCl solution. Measurements were also taken on the uacoated substrate and hard chromium coatings for comparison. Multilayer microstructure and morphology were studied by X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM) and chemical composition was studied by energy dispersive X-ray analysis (EDX). The experiments showed that CrN/Cr coatings having lower bilayer period and lower thickness increased their efficiency as a barrier and improved the corrosion resistance of all coatings evaluated. (C) 2012 Elsevier Ltd. All rights reserved.
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