Acid corrosion behaviour of Ti–48Al–6Nb porous alloys with different phase skeletons

Ti-48Al-6Nb porous alloys with different phase skeletons were synthesised by powder metallurgy at different temperatures. TiAl3 skeletons achieved at 700 degrees C were covered by corrosion products and skeletons fractures led to pores collapse. TiAl skeletons were synthesised at 900 degrees C with obvious corrosion pits and pore diameter increasing. And Ti3Al/TiAl skeletons achieved at 1350 degrees C exhibit the best acid corrosion resistance with the least mass loss of 1.853 mg m(-2). Skeletons and pore diameters remained stable just with fully lamellar structures emerged. In addition, Nb2Al phases presented better resistance than NbAl3 in the skeletons contributing to acid corrosion resistance of the porous alloys.