Abstract
In this study, Cu2O/CuO and Cu were electrodeposited onto a mortar surface to protect concrete sewers from microbially induced corrosion. The effects of temperature and electrolyte pH on the antimicrobial performance of the electrodeposited specimens were investigated through surface analysis and measurements of bacteria inhibition rate during the exposure to Desulfovibrio desulfuricans and Acidithiobacillus thiooxidans. Variations in the number of sulphate-reducing bacteria (SRB) cells were determined directly using haemocytometer, and sulphate concentration and pH of sulphate-oxidizing bacteria (SOB) medium were measured to evaluate the bactericidal property against SOB. Results demonstrate that all the electrodepositited specimens exhibited a favourable bactericidal performance. In addition, a short-term simulated microbially induced corrosion experiment running for 30 days was conducted. Visual, physical and ions leaching investigations of mortar samples were performed to estimate the durability. Considering the integrity of the coated surface, bactericidal property, the leaching rate of Cu2+ ions, and permeability of the treated specimens, 60 °C and pH 11 were determined to be the optimum conditions for electrodeposition.
Published Version
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