Sinergia entre la corrosión erosión del acero 1045 recubierto por multicapas de TiN/TiAlN

Abstract

This paper presents the results of the evaluation to the resistance to dynamic corrosion, erosion and corrosion-erosion at an impact angle of 90$^{\circ}$ of thin films in the form of multilayer TiN / TiAlN deposited with periods of 2, 6, 12 and 24 bilayers on substrates of AISI 1045 steel, through a system with rf reactive magnetron sputtering from Ti and Al targets of high purity (99.99%) in an atmosphere composed of Ar / N. The electrochemical characterization was carried out by using Tafel polarization curves and microstructural characterization by scanning electron microscopy. There was a significant decrease in the corrosion rate for the coated samples in terms of dynamic corrosion and corrosion-erosion. The sample covered by 24 bilayers had the best behavior in both situations, confirming a good performance of the bilayers to the resistance to corrosion and erosion corrosion. The results of scanning electron microscopy showed a good sealing of the bilayers, which confirms the protective effect given by the substrate coatings.