TITANIUM AND NONCONVENTIONAL TITANIUM-ALL OYS CORROSION IN RINGER SOLUTION - II LONG-DURATION TESTS ASSESSMENTS

The paper investigates the long term (350-450 hours) corrosion behavio ur of Ti, two binary alloys (Ti-15Mo and Ti-32Mo) and two ternary allo ys (Ti-5Al-15Mo, Ti-10Al-10Mo) in Ringer's solution of different pH (f rom 2.64 to 7,53) being accented on their localised corrosion suscepti bility. The long term variation of the corrosion potentials, of the di ssolution current densities in passive range and to the potential and current gradients which can appar due of, the pH change, permitted the estimate of the corrosion rates, material stability in corrosion medi a and the localised corrosion susceptibility. It results that the corr osion resistance is determined by the passive film composition, the hy drolysis and dissolution capacity of this film and the pH of the solut ion.