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Determination of the best behavior of [TiCN/TiNbCN]<inf>n</inf> multilayer coating on erosion-corrosion resistance with varying particle angular velocity

Abstract:

The goal of this work is to study electrochemical behavior under corrosion-erosion conditions for [TiCN/TiNbCN]n multilayer coatings with periods of 1, 50, 100, 150 and 200 bilayers deposited by a magnetron sputtering technique on AISI 4140 steel substrates. The erosion-corrosion experiments were performed in a test machine in which the impact velocity, impact angle, concentration of solids and pH of the solution were controlled. The multilayers were evaluated compared to corrosion, erosion and erosion corrosion at two impact angles of 30 ° and 90 ° in a solution of 0.5 M NaCl and silica, analyzing the effect of impact angle and the number of bilayers in the corrosion resistance of these coatings. The electrochemical characterization was realized using the Tafel polarization curves technique and microstructural characterization by scanning electron microscopy. The results show a decrease in corrosion rate for multilayer systems tested at 30° with periods of 150 and 200 bilayers. © 2013 by ESG.