The effect of microstructure on the corrosion behavior of Ti-6Al-4V titanium alloy was investigated. Solution annealing at 1066 °C for 1 h followed by cooling at different rate was applied. The microstructure as well as the chemical composition changes after heat treatment was analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Dual phase (α+β) microstructure was obtained for the solution annealed alloy either cooled in air or in furnace, while martensite was obtained if it was water-quenched. The stability of passive film formed in air or in 1 M HCl + 0.5 M H2SO4 mixed solution was investigated by conducting potential decay measurement and Auger electron spectroscopy (AES). At open circuit potential, selective dissolution of vanadium-depleted α phase in 1 M HCl + 0.5 M H2SO4 mixed solution was found.

Subject
Scanning electron microscopy, Oxides, Metal surfaces, Oxide formation, Passive films, Metal oxides, Chemical composition, Furnaces, Solutions, Oxide surfaces, Immersion, Titanium alloys, Corrosion potential
Keywords:
Ti-6Al-4V alloy, selective dissolution, potential decay, passivity
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2009
Association for Materials Protection and Performance (AMPP)
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