Adhesion of Anodic Titanium Dioxide Coatings on Titanium Grades 5 Alloys

VERA, M.L.; MARIO ROBERTO ROSENBERGER; SCHVEZOV, C. E.; ARES, A.E.

Orlando

Conferencia; TMS 2015 - 144rd ANNUAL MEETING & EXHIBITION; 2015

TMS

p { margin-bottom: 0.21cm; direction: ltr; line-height: 120%; text-align: left; widows: 2; orphans: 2; }p.western { font-size: 12pt; }p.cjk { font-size: 12pt; }p.ctl { font-size: 12pt; }a:link { color: rgb(0, 0, 255); } 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.