Influence of Component Size on the Corrosion Behavior of Ti6Al4V Alloy Fabricated by Electron Beam Powder Bed Fusion

The electrochemical behavior of Ti–6Al–4V with 1 mm and 16 mm thickness prepared by electron beam powder bed fusion (EB-PBF) was investigated in phosphate buffered saline. Electrochemical results showed that EB-PBF Ti–6Al–4V with a larger component size was more resistant to corrosion compared to the smaller component, because of less acicular α ʹ phase content and more β phase content. As a non-equilibrium phase in the “high-energy state”, α ʹ phase has a greater susceptibility to corrode and reduces the corrosion resistance of the material, while β phase improves corrosion resistance of titanium alloys. The results show that the phase composition has a more significant effect on the corrosion performance than the grain size.