NaCl과 NaBr수용액에서 적층가공으로 제조된 Ti-6Al-4V 합금의 공식 저항성 비교
Comparing Resistances to Pitting Corrosion of Additive Manufactured Ti-6Al-4V Alloys in NaCl and NaBr Aqueous Solutions
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Resistances to pitting corrosion of additive manufactured (AM) Ti-6Al-4V alloys in 0.6 M NaBr and 0.6 MNaCl aqueous solutions were compared using micro-droplet cell techniques. With respect to the pittingcorrosion resistance, this study focused on two different types of halide anions in aqueous solutions, i.e. Br- and Cl-. The differences between Br- and Cl- halide anions for breakdown on passive films of AMTi-6Al-4V alloy were explained using Langmuir adsorption model with their equilibrium adsorption coefficients. The results of the analysis showed that the lower resistance to pitting potential of AM Ti-6Al-4V alloyin Br- aqueous solution was attributed to the higher equilibrium adsorption coefficient of Br-. In addition,micro-electrochemical test results showed that the pitting corrosion resistance of dark grains in additivemanufactured Ti-6Al-4V alloy was lower as compared to that of bright grains due to the larger volumeof α' phase that caused the susceptibility to pit initiation.
Abstract
Resistances to pitting corrosion of additive manufactured (AM) Ti-6Al-4V alloys in 0.6 M NaBr and 0.6 MNaCl aqueous solutions were compared using micro-droplet cell techniques. With respect to the pittingcorrosion resistance, this study focused on two different types of halide anions in aqueous solutions, i.e. Br- and Cl-. The differences between Br- and Cl- halide anions for breakdown on passive films of AMTi-6Al-4V alloy were explained using Langmuir adsorption model with their equilibrium adsorption coefficients. The results of the analysis showed that the lower resistance to pitting potential of AM Ti-6Al-4V alloyin Br- aqueous solution was attributed to the higher equilibrium adsorption coefficient of Br-. In addition,micro-electrochemical test results showed that the pitting corrosion resistance of dark grains in additivemanufactured Ti-6Al-4V alloy was lower as compared to that of bright grains due to the larger volumeof α' phase that caused the susceptibility to pit initiation.
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