Abstract
Ti-5Al-2.5Sn alloy plates of 1.6 mm thickness were EB welded using four weld patterns (rectangular, elliptical, concentric circles and arrow). The fusion zone of all the patterns with variable amount had α´ martensite and acicular α with prior β at grain boundaries which resultantly affected the corrosion resistance. Several electrochemical techniques indicated that the elliptical pattern showed better passivation and film stability as compared to other patterns. The arrow pattern experienced more pitting due to the higher proportion of α´ martensite in its FZ. The EIS data indicated that the elliptical pattern had a stable uniform layer formation on the surface with low passivation resistance. In case of BM, uniform passivation layer of oxides was formed, without any sensitization.
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