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Evaluation of the corrosion erosion by cavitation in [TiN/ZrN] multilayers coatings

Abstract:

In this work is presented the mitigation of the damages caused by the corrosion erosion phenomenon through application of [TiN/ZrN]200 coatings obtained by the multi-target magnetron sputtering PVD technique and deposited on 4140 steel substrates. The test was performed in a cavitation chamber which is adapted to a potentiostat galvanostat to determinate the corrosion susceptibility. The multilayers were evaluated against the corrosion erosion synergy in a solution composed of 3% NaCl, analyzing the effect of the multilayers period increase. The electrochemical characterization was made by the electrochemical impedance spectroscopy and Tafel polarization curves. By scanning electron microscopy was determined the morphology after the degradation test. Making performance analysis was found that the deposition of the [TiN/ZrN]n multilayers, influences the degradation resistance by the cavitation phenomenon, prolonging the corrosive phenomenon which controls the material deterioration further no mechanical wear. © 2014 The Authors.