Beer is a widely consumed alcoholic beverage throughout the world and global production figures have shown an increase in trend during the last decade. Many failures and corrosion problems encountered in brewery and fermentation process due to corrosivity of fluids which are rather acidic and also contain live microfauna. Presence of yeast and chloride ion can cause not only pitting corrosion but also microbiologically induced corrosion which lead to biofouling and failures.In this study, the effect of fermentation products on corrosivity of copper and three austenitic stainless steel is evaluated by electrochemical methods. The metallic samples put into the fermenter vessel and several electrochemical impedance spectroscopy (EIS) tests performed during the fermentation and after that samples were removed from the fermenter and examined by optical microscope (OM) for detecting biofilm and corrosion products. Results showed that EIS curves have changed during the fermentation due to corrosion and biofilm formation.Keywords: Brewing, Corrosion, Biofilm, Electrochemical tests, Corrosion products
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