Adhesion of Anodic Titanium Dioxide Coatings on Titanium Grades 5 Alloys

MARÍA LAURA VERA; MARIO ROBERTO ROSENBERGER; CARLOS E. SCHVEZOV; ALICIA E. ARES

Orlando

Congreso; TMS 2015: 144th Anual Meeting and Exhibition; 2015

The Minerals, Metals and Materials Society

In the present research the adhesion of thin anodic coatings of TiO2 (40 nm to 140 nm) is evaluated. Coatings were produced by anodic oxidation of Ti-6Al-4V, using H2SO4 as electrolyte at different voltages (20 V to 70 V), employing heat treatments of 1 h at 500 °C and 600 °C. The adhesion of coatings was evaluated by scratch test with load rates of 2 N/mm and 4 N/mm and up to 10 N and 20 N of maximum load. The adhesion was dependent on the increasing load rates. At larger rate a brittle behavior was found and the critical load decreased with heat treatment temperature. For non-heat treated coatings, the critical load of adherence increased with coating thickness.