A metallic biomaterial tribocorrosion model linking fretting mechanics, currents, and potentials: Model development and experimental comparison

This study presents a theoretical approach to predict currents and voltages over time utilizing the concepts of heredity integrals, area‐dependent surface impedance, contact mechanics and the hig h field physics of oxide repassivation. Two heredity integrals are presented relating, first, the sliding mechanics and oxide film repassivation physics to the current, and second, relating the electrode potential to the current using impedance concepts. Current–potential–time responses to contr olled fretting conditions were measured across a fretting frequency from 0.2 to 10 Hz and compared to theoretical results. The coupled integrals were shown to predict the overall current–potential–time behavior for CoCrMo alloy surfaces under several controlled fretting corrosion conditions (loa ds, sliding speeds, etc.) with a high degree of similarity. These models can be adapted to numerical analyses of tribocorrosion to predict performance.
Source: Journal of Biomedical Materials Research Part B: Applied Biomaterials - Category: Materials Science Authors: Tags: ORIGINAL RESEARCH REPORT Source Type: research