Discoloration and Dissolution of Titanium Peroxide - or Fluoride - containing Solutionsand Titanium Alloys withImmersion in

fluoride-containing solutien. Commercially pure titanium (CP-Ti) and six titanium-based alloys were used: Ti-O.15Pd, Ti6Al-4V, Ti-7Nb-6Al, Ti-55Ni, Ti-10Cu, and Ti-20Cr. Two test solutions were prepared fbr immersion of polished titanium and titanium alloys: one consisting of O,2% NaF + O,9% NaCl (pH 3.8 with lactic acid) and the other of O.1 mol/1 H202 + O.9% NaCl (pH 5.5). Following immersion, color changes were determined with a color meter and released elements were measured using IC?-OES. Discoloration and dissolution rates differed between the two solutions, In the hydrogen peroxide-containing solution, color difference was higher in Ti-55Ni and Ti-6AI-4V than in any of the other alloys, and that Ti55Ni showed the highest degree of dissolution, In the acidulated fiuoride-containing selutien, CP-Ti, Ti-O.15Pd, Ti-6A]-4V, Ti-7Nb-6Al, and Ti-10Cu alloys showed rernarkable discoloration and dissolution with irnrmersion, On the contrary, Ti-20Cr alloy showed very Iittle discoloration and dissolution in either solution.