Abstract

OLAYA, John Jairo; PIRATOBA, Ulises  and  RODIL, Sandra Elizabeth. Resistencia a la corrosión de recubrimientos de CrN depositados por PVD con UBM: tecnología eficiente y ambientalmente limpia. Rev. LatinAm. Metal. Mater. [online]. 2011, vol.31, n.1, pp.44-51. ISSN 0255-6952.

In this work, we studied the influence of the magnetic field configuration on the resistance to the corrosion of CrN coatings, obtained in a system of Unbalanced Magnetron Sputtering (UBM). The different configurations from the magnetic field were quantified through geometric unbalanced coefficient K_G. The microstructure was analyzed by means of scanning electronic microscopy (SEM), and phases and preferential orientations with X ray diffraction (XRD). The corrosion resistance was studied by Tafel polarization in a 0,5M H₂SO₄ - 0,05M KSCN solution and spectroscopy electrochemical Impedance using a NaCl 3% solution. In general, the configuration of the magnetic field influenced in the preferential orientation of the coatings: With K_G = 1.3 the CrN films had a (200) preferential orientation and with K_G = 0.85 had a (200) (111) mixed orientation. Smaller corrosion rates were observed in the coatings deposited on AISI 304 steel substrates with K_G = 1.3

Keywords : CrN; corrosion resistance; UBM; unbalanced magnetron.