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A Novel Liquid Based Epoxy-Functionalized Zeolite Coating for Protection of Concrete Pipes from Biogenic Corrosion

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The inhibition of the corrosive action of Acidithiobacillus thiooxidans on concrete specimens coated by functionalized zeolite was studied. Uncoated, epoxy-coated (EP), unfunctionalized zeolite coated (ZC) and functionalized zeolite coated concrete specimens with various epoxy to zeolite to cure weight ratios (Z1, Z2 and Z3) were studied. In the uncoated, EP, ZC and Z1 specimens, sulfate production rates were 0.83, 9.1, 9.3 and 8.8 mM SO4 2−d−1, respectively. The corresponding values for Z2 and Z3 were negligible due to their bacterial inhibition property. In biofilm inhibition studies, peak biomass specific oxygen uptake rates (OURs) for bacterial cells detached from specimens were 0.03 and 0.06 mgO2 mg SS−1 h−1 for the uncoated and ZC, respectively. For Z2 there was no temporal oxygen uptake due to its bio-toxic characteristics. The rates of biofilm formation on the surface of the uncoated, ZC and Z2 specimens were 0.04, 0.02 and 0.03 mg SS cm−2d−1.

Document Type: Research Article


Publication date: 2008-01-01

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