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Bilayer period effect on corrosionerosion resistance for [TiN/AlTiN] <inf>n</inf> multilayered growth on AISI 1045 steel

Abstract:

The aim of this work is to study the electrochemical behavior, under a corrosionerosion condition, of [TiN/AlTiN]n multilayer coatings with bilayers periods of 1, 6, 12 and 24, deposited by a magnetron sputtering technique on Si (1 0 0) and AISI 1045 steel substrates. The TiN and AlTiN structure for multilayer coatings were evaluated via X-ray diffraction (XRD) analysis. Silica particles were used as an abrasive in the corrosionerosion test within a 0.5 M H2SO4 solution at an impact angle of 30° over the surface. The electrochemical characterization was carried out using a polarization resistance technique (Tafel), in order to observe changes in the corrosion rate as a function of the bilayers number (n) or bilayer period (Λ). Corrosion rate values of 359 mpy in uncoated steel substrate and 1.016×10-6 mpy for substrate coated with [TiN/AlTiN] 24 under impact angle of 30° were found. This behavior was related with the mass loss curve for all coatings and the surface damage was analyzed using SEM images. These results indicate that TiN/AlTiN multilayer coatings deposited on AISI 1045 steel provide a practical solution for applications in erosivecorrosive environments. © 2010 Elsevier Ltd.