Abstract
The solution and aging treatments (SAT) were adopted to improve the microstructure and the corrosion resistance ability of laser solid formed (LSFed) Ti-6Al-4V titanium alloy. The effect of the SAT on the electrochemical properties of the LSFed Ti-6Al-4V in a 3.5wt. % NaCl solution was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The microstructure changes after SAT, resulting in the transition from the columnar grains in the LSFed Ti-6Al-4V to the basket-weave grains. After SAT, the microhardness of material is significantly reduced. The corrosion resistance of solution and aging treated (SATed) Ti-6Al-4V is slightly better than that of the as-deposited Ti-6Al-4V, which is manifested by the decrease of icorr value, the increase of impedance modulus and the reduction of the number of surface pits after electrochemical corrosion.
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