Evaluation of the Corrosion Erosion by Cavitation of Multilayer Coatings Type Binary, Ternary and Quaternary Deposited on Steel AISI 4140

摘要

This article presents the evaluation of the corrosion erosion resistance erosion caused by cavitationgenerated on the binary type coatings [TiN / CrN]200, ternary [TiN / AlTiN]200 and quaternary [TiCN /TiNbCN]200 obtained by physical vapour deposition magnetron sputtering technique multi-target anddeposited on 4140 steel substrates by comparing the uncoated substrate. The coatings were exposed toerosive, corrosive conditions and synergy compared to AISI 4140 steel. The electrochemicalcharacterization are employed electrochemical impedance spectroscopy techniques and Tafelpolarization curves. With respect to the characterization of degraded surfaces scanning electronmicroscope was used. The evaluation of the phenomenon of mechanical wear due to cavitation isperformed using a high frequency generator. The protective effect in each of the evaluated systemswas determined, generating improvements in the mechanical and corrosion properties.