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

Year 2010, Volume: 56 Issue: 2, 1 - 9, 01.12.2010

Nalan Oya San Hasan Nazır

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

Keywords

Microbial Corrosion, Nickel-Cobalt Alloy, SEM, EIS

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

Abstract

Bu çalışmanın amacı, Pseudomonas aeruginosa bakterisinin nikel-kobalt Ni-Co alaşımına korozyon etkisinin incelenmesidir. Korozyon oranı, Tafel ve elektrokimyasal empedans spektroskopisi EIS ile belirlenmiştir. Alaşım yüzeyinin morfolojisi ve bileşimi taramalı elektron mikroskobu SEM ve X-ışınları saçılımı EDS ile incelenmiştir. Tafel grafikleri, zamana bağlı olarak polarizasyon direncinin düştüğünü, akım yoğunluğunun ise arttığını göstermiştir. Bu değişim yüzeyde oluşan biyofilm tabakası ve çukurcuk korozyonu nedeniyledir. Nyquist yarım darireleri düşük frekanslarda açık hale gelmektedir. Korozyonun artığını gösteren bu değişim, alaşım yüzeyinde meydana gelen yarılma ve biyofilm tabakasında oluşan çatlaklardan dolayıdır.

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