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Investigation of SRB induced biocorrosion of mild steel and its control
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Author : Akansha Sharma, R. Manivannan and S. Noyel Victoria*
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ABSTRACT
Recently there has been a growing interest on biocorrosion of mild steel which is commonly used in ship ballast tank construction. Though prone to corrosion, mild steel finds abundance applications because of its inexpensive nature and ease of machinability. Biocorrosion caused by anaerobic bacteria causes significant damage and among the anaerobic population, sulfate reducing bacteria (SRB) tops the list. This study investigates the biocorrosion of mild steel by Desulfovibrio desulfuricans in neutral media. The use of bitter gourd extract as the corrosion inhibitor has been investigated using weight loss studies. The biotic media caused significant corrosion with a weight loss of 75.6 mg in 4 weeks immersion period. The use of 100 ppm bitter gourd extract was able to give about 94.4% inhibition efficiency against corrosion. The electrochemical studies also show similar trend like weight loss experiments.
KEYWORD
Mild steel, biocorrosion, bitter gourd, SRB, inhibition