Corrosion resistance improvement of steel AISI 4140 by using a titanium/titanium nitride multilayer coating system

  • Faber Correa Universidad Autónoma de Occidente
  • Julio César Caicedo Universidad del Valle
  • William Aperador Universidad del Valle
  • Carlos Alberto Rincón Universidad del Cauca
  • Gilberto Bejarano Universidad de Antioquia
Keywords: multilayer, magnetron sputtering, titanium nitride, corrosion

Abstract

Steel 4140 is widely used for fabrication of machines components with hardness between 25 and 35 Rockwell C (HRC). However, life time of this steel is limited by its low wear and corrosion resistance. In order to enhance its corrosion behavior, multilayer of Ti/TiN were deposited onto 4140 steel samples by d.c. reactive magnetron sputtering using a high purity titanium target (99.9) in an Ar/N2 atmosphere. With the purpose to study the influence of the layer number on the rate of corrosion of deposited films, multilayer of [Ti /TiN] were growth with 1, 5, 10, 15 and 20 bilayers and a 3 µm constant thickness for all samples. The grown phases and chemical composition were analyzed by x-ray diffraction spectroscopy (XRD), and energy dispersive X-ray spectroscopy (EDX) respectively. Additionally, the uncoated and coated steel samples were characterized using electrochemical impedance spectroscopy (EIS) and Tafel’s polarisation curves. A corrosion rate reduction of approximately 87% was found for the steel sample coated with 20 bilayers of Ti/TiN compared with the uncoated, and of 25% related to the sample coated with 1 bilayer. This evidences the positive effect of the period increase of the multilayered Ti/TiN thin films on their corrosion resistance.

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Author Biographies

Faber Correa, Universidad Autónoma de Occidente

Grupo de Ciencias e Ingeniería de Materiales

Julio César Caicedo, Universidad del Valle

Grupo de Películas Delgadas

William Aperador, Universidad del Valle

Grupo de Películas Delgadas

Carlos Alberto Rincón, Universidad del Cauca

Departamento de Física

Gilberto Bejarano, Universidad de Antioquia

Grupo de Corrosión y Protección, Grupo de Ciencia e Ingeniería de Materiales Compuestos

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Published
2013-12-10
How to Cite
Correa F., Caicedo J. C., Aperador W., Rincón C. A., & Bejarano G. (2013). Corrosion resistance improvement of steel AISI 4140 by using a titanium/titanium nitride multilayer coating system. Revista Facultad De Ingeniería Universidad De Antioquia, (46), 7-14. Retrieved from https://revistas.udea.edu.co/index.php/ingenieria/article/view/17919