Effect of applied bias voltage on corrosion-resistance for TiC1−xNx and Ti1−xNbxC1−yNy coatings |
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Authors: | JC Caicedo C Amaya L Yate G Zambrano J Alvarado-Rivera P Prieto |
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Institution: | a Department of Physics, Universidad del Valle, Ciudad Universitaria Meléndez, A.A. 25360 Cali, Colombia b Laboratorio de Recubrimientos Duros DT-ASTIN SENA, Cali, Colombia c Department de Física Aplicada i Óptica, Universitat de Barcelona, Catalunya, Spain d Centro de Investigación y de Estudios Avanzados del IPN, Unidad Querétaro, Mexico e Centro de Excelencia en Nuevos Materiales, Calle 13 #100-00 Edificio 320, espacio 1026, Cali, Colombia |
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Abstract: | Corrosion-resistance behavior of titanium carbon nitride (Ti-C-N) and titanium niobium carbon nitride (Ti-Nb-C-N) coatings deposited onto Si(1 0 0) and AISI 4140 steel substrates via r.f. magnetron sputtering process was analyzed. The coatings in contact with a solution of sodium chloride at 3.5% were studied by Tafel polarization curves and impedance spectroscopy methods (EIS). Variations of the bias voltage were carried out for each series of deposition to observe the influence of this parameter upon the electrochemical properties of the coatings. The introduction of Nb in the ternary Ti-C-N film was evaluated via X-ray diffraction (XRD) analysis. The structure was characterized by using Raman spectroscopy to identify ternary and quaternary compounds. Surface corrosion processes were characterized using optical microscopy and scanning electron microscopy (SEM). XRD results show conformation of the quaternary phase, change in the strain of the film, and lattice parameter as the effect of the Nb inclusion. The main Raman bands were assigned to interstitial phases and “impurities” of the coatings. Changes in Raman intensities were attributed to the incorporation of niobium in the Ti-C-N structure and possibly to resonance enhancement. Finally, the corrosion data obtained for Ti-C-N were compared with the results of corrosion tests of Ti-Nb-C-N coating. The results obtained showed that the incorporation of niobium to Ti-C-N coatings led to an increase in the corrosion-resistance. On another hand, an increase in the bias voltage led to a decrease in the corrosion-resistance for both Ti-C-N and Ti-Nb-C-N coatings. |
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Keywords: | 61 05 cf 68 30j 68 35 Ja 68 43 Pq 67 80 de 65 40 gk |
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