Sample # Mechanical treatments Chemical treatment smoothing blasting T1 No No 15 min (BP) in HCl (9%): H2SO4 (35%) T2 80 Grit-paper No 15 min (BP) in HCl (9%): H2SO4 (35%) T3 180 Grit-paper No No T4 180 Grit-paper No 15 min (BP) in HCl (9%): H2SO4 (35%) T5 No 350 μm-10 s 7 min (BP) in HCl (7%): H2SO4 (30%) T6 No 350 μm-10 s 15 min (BP) in HCl (7%): H2SO4 (30%) T7 No 350 μm-10 s 6 min (BP) in HCl (7%): H2SO4 (30%) T8 No 350 μm-10 s 15 min (RT) in HCl (7%): H2SO4 (30%) T9 No 350 μm-10 s 60 min (RT) in HNO3 (29%) T10 No 350 μm-10 s 60 min (RT) in HNO3 (42%) T11 No 350 μm-10 s 120 min (RT) in HNO3 (29%) T12 No 350 μm-10 s 120 min (RT) in HNO3 (42%) T13 No 350 μm-10 s No T14 No No No T15 No 350 μm-10 s 3 min (BP) in HCl (7%): H2SO4 (30%) T16 No 350 μm-10 s 10 min (RT) in HCl (7%): H2SO4 (30%) T17 No 350 μm-10 s No T18 No 350 μm-10 s 1 min (BP) in HCl (7%): H2SO4 (30%) RT and BP indicate the room temperature and the boiling point of the mixture used for the attack, respectively.

Table 1: Sequence of mechanical and chemical treatments applied on Ti2 samples.