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Corrosion Resistanne of the [TiN/CrN]n Coatings Deposited on Steel AISI 4140

Abstract:

In this paper is presented the improvement against corrosion of the multilayer coatings [TiN/CrN]n with periods of 20, 50, 100 and 200 bilayers deposited by the PVD magnetron sputtering technique on carbon steel AISI 4140. The electrochemical evaluation was performed by electrochemical impedance spectroscopy (EIS) and the polarization curves techniques in a solution of 3.5% wt. of NaCl. The corrosion resistance increased gradually in function of the bilayer number in comparison with the substrate; finding corrosion velocity values of 1225 μmy for the substrate without coating and 72.75 μmy for the specimen with 200 bilayers. The electrochemical results reveal the positive effect regarding the superficial protection of the 4140 steel with the increase of the period in the multilayers of [TiN/CrN]n. © 2013 by ESG.