CORROSION ELECTROCHEMISTRY of ALUMINUM AND TITANIUM ALLOYS in HALIDE ENVIRONMENTS

摘要

Linear potential sweeps of Ti and Ti-6-4, Al and 2024A1-T4 in 1M NaCl, NaBr and NaI and mixtures of the halides have been performed to obtain the relative pitting potentials of these metals in the presence of these aggressive anions. For Al and 2024A1-T4 pitting potentials increased in the order Cl~- < Br~- < I~- with more negative pitting potentials obtained for Al. The order was Br~- < I~- < Cl~- for Ti and Ti-6-4 with lower pitting potentials for Ti-6-4. On the other hand, in methanol solutions Ti in Cl~- had the most negative pitting potential with the order Cl~- < Br~- < I~-. Potential/current oscillatons were observed for Ti in bromide and iodide media. Analysis of this oscillatory behavior indicate clearly deterministic and not stochastic phenomena.