CP-Ti 및 Ti-6Al-4V 합금의 전기화학적 특성에 미치는 제조공정의 영향
Effect of Manufacturing Process on Electrochemical Properties of CP-Ti and Ti-6Al-4V Alloys
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Ti and its alloys show the excellent corrosion resistance to chloride environments, but they show lesscorrosion resistance in HCl, H2SO4, NaOH, H3PO4, and especially HF environments at high temperatureand concentration. In this study, we used the commercially pure titanium and Ti-6Al-4V alloy, andevaluated the effect of the manufacturing process on the electrochemical properties. We used commercialproducts of rolled and forged materials, and made additive manufactured materials by DMT (DirectedMetal Tooling) method. We annealed each specimen at 760oC for one hour and then air cooled. Weperformed anodic polarization test, AC impedance measurement, and Mott-Schottky plot to evaluatethe electrochemical properties. Despite of the difference of its microstructure of CP-Ti and Ti-6Al-4Valloys by the manufacturing process, the anodic polarization behavior was similar in 20% sulfuricacid. However, the addition of 0.1% hydrofluoric acid degraded the electrochemical properties. Amongthree kinds of the manufacturing process, the electrochemical properties of additive manufactured CP-Ti,and Ti-6Al-4V alloys were the lowest. It is noted that the test materials showed a Warburg impedancein HF acid environments.
Abstract
Ti and its alloys show the excellent corrosion resistance to chloride environments, but they show lesscorrosion resistance in HCl, H2SO4, NaOH, H3PO4, and especially HF environments at high temperatureand concentration. In this study, we used the commercially pure titanium and Ti-6Al-4V alloy, andevaluated the effect of the manufacturing process on the electrochemical properties. We used commercialproducts of rolled and forged materials, and made additive manufactured materials by DMT (DirectedMetal Tooling) method. We annealed each specimen at 760oC for one hour and then air cooled. Weperformed anodic polarization test, AC impedance measurement, and Mott-Schottky plot to evaluatethe electrochemical properties. Despite of the difference of its microstructure of CP-Ti and Ti-6Al-4Valloys by the manufacturing process, the anodic polarization behavior was similar in 20% sulfuricacid. However, the addition of 0.1% hydrofluoric acid degraded the electrochemical properties. Amongthree kinds of the manufacturing process, the electrochemical properties of additive manufactured CP-Ti,and Ti-6Al-4V alloys were the lowest. It is noted that the test materials showed a Warburg impedancein HF acid environments.
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