Anodic oxidation and stress corrosion cracking (SCC) of titanium alloys |
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Authors: | A Aladjem M Aucouturier P Lacombe |
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Affiliation: | (1) Lab. de Metallurgie Physique, Faculté des Sciences, Université de Paris-Sud, 91405 Orsay, France |
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Abstract: | Uniform and reproducible oxide films were formed on alloy Ti-6Al-6V-2.5Sn by anodic oxidation in aqueous 0.5% H3BO3, at 10 mA cm−2 and voltages up to 110V; dielectric break down occurred above 120V. A parallelism was found between the effect of environmental
factors on stress corrosion cracking (SCC), as reported in the literature and the anodic behaviour, as observed by ourselves:
factors that increased susceptibility to SCC (increase in temperature or viscosity, alloying, introductions of CI− or methanol, lowering of pH) reduced passivity under anodic polarization, while factors that inhibited SCC (thicker oxide
films, high pH, phosphate ions) increased passivity. The passivity was associated both with the presence of the anodic oxide
and with a transitory effect of the electric field across the oxide and the oxide-electrolyte interface. |
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