THE INFLUENCE OF Pseudomonas aeruginosa ON CORROSION BEHAVIOR OF NICKEL-COBALT ALLOY

Abstract

The aim of this study was to determine the effect of Pseudomonas aeruginosa bacterium on the corrosion of nickel-cobalt (Ni-Co) alloy. The corrosion rate was determined with using of Tafel slopes and Electrochemical Impedance Spectroscopy (EIS). The morphology and the formation of the alloy surface were observed by scanning electron microscopy (SEM) and energy dispersive X-ray spectra (EDS) analysis. It was observed from the Tafel plots that the polarization resistance decreases and the current density increases with a change in time. This was attributed accumulation to the biofilm on the surface and therefore surface became pitted. The Nyquist semicircles tended to open at lower frequencies which indicated the crevice of the surface and the rupture of protective film.