College of Engineering

Title of the Seminar: Investigate the corrosion of hip implant

Presenter: Ali Abdrahman Ali

Summary: One of the most significant current discussions in hip implant corrosion is modular taper junction. Pervious research has shown that the modular tapers have many advantages for the surgeons as it can be adjusted and different alloys can be mixed for the system such as cobalt-chromium and titanium for modular head. One of the major drawbacks for all modular hip implant is that a potential site of corrosion has been introduced at these interface component. This has been identified as a possible source of early failure of the implant. This report describe an investigation into hip implant corrosion mechanism and the effect of surface roughness texture such Ra, Ssk and Sku parameters. One of the main aims of this report has been to design an experiment to evaluate the impact of these parameters on the pitting and crevice corrosion. Samples of hip implant as well as samples with different grit surface finishes (P240, P400, P800, P1200 and 3µm diamond) were observed. Linear polarization and cyclic voltammetry scans were performed according to the "standard test method for pitting or crevice corrosion of metallic surgical implant materials and conducting cyclic potentiodynamic polarization to determine the corrosion susceptibility of small implant devices". The effect of Ra factor seems to show that there is a linear relation between smoother surfaces. Pitting potential and corrosion current are visually confirmed with SEM images. The samples with positive skew (+ve skew) show high pitting potential and more susceptible to crevice corrosion while there is no obvious change or strong influence of correlation with Sku parameter.

Place of the Seminar: Meeting hall of electrical and computer Eng. Department

Date: 24-05-2022

Time: 11:45