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Ingeniare. Revista chilena de ingeniería

versión On-line ISSN 0718-3305


CELY, Ma. Mercedes; CASTELLAR O., Grey; PEREIRA C., Jhorman  y  ANGEL V., Robert. Effect of heating rate on the mechanical properties and corrosion resistance of titanium alloy modified. Ingeniare. Rev. chil. ing. [online]. 2018, vol.26, n.4, pp.577-584. ISSN 0718-3305.

Titanium alloys are widely used as biocompatibles materials, due to their chemical stability inside of the body, a good relationship between density/resistance, fatigue resistance, corrosion resistance and other. The capacity of these materials to develop a naturally passive oxide layer on the surface, makinge them favorable for different applications. However, the stability of the film is affected by aggressive environment. Therefore, the surface modification process has been an alternative to improve the corrosion resistance, and some mechanical properties. This research evaluated the effect of the heating rate on the thermal oxidation of titanium alloys (Ti6Al4V). The method consisted in producing oxide films by thermal oxidation at 600, 700 and 800°C at different heating rates 3, 4 and 5 °Cmin-1 and isothermal cooling in furnace. Morphological characterization was carried out through Scanning Electronic Microscopy, and the corrosion resistance test was carried out by potentiodynamic polarization study using Ringer´s solution as an electrolyte. The results showed the influence of the temperature and heating rate on the thickness of the oxide layer in factorial design 32. Thermally oxidized samples at 600 and 800°C showed the best results regarding corrosion resistance compared to untreated samples, and the hardness increased 2.5 fold in samples oxidized at 800°C compared to the base alloy.

Palabras clave : Ti6Al4V alloy; thermal oxidation; corrosion; hardness; factorial design.

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