International Journal of Modern Science and Technology, 1(3), 2016, Pages 93-101.
Investigations on microbiologically influenced corrosion
Juhaina Saleh Fadhil Al-Fori, Parimal Sharad Bhambare, Elansezhian Rasu
Caledonian College of Engineering, Department of Mechanical & Industrial Engineering, Seeb, Muscat,
Sultanate of Oman.
Microbial influenced corrosion is a type of corrosion that happen on a metal's surface under the seawater. Microbial influenced corrosion occurs due to the colonization of microorganism on the surface, these microorganisms may be fungus, bacteria or algae. In this project the E. coli bacteria are used to investigate the microbial influenced corrosion on metal sample. Metal sample which is an alloy steel is coated with different coatings namely: rubber, epoxy, polyurethane and chrome. Rubber and chrome were spray painted, while epoxy and polyurethane were applied using brush. The samples with these coatings are tested using different tests to find out the best one which can resist microbial influenced corrosion better than the others. These tests are; wet and dry test, atmospheric test, corrosion monitoring test and hardness test. To find the corrosion progress the weight loss and corrosion rate is found in the samples. The optical microscope is used to understand the corrosion progress in the metal surfaces and for the hardness test. The result analyzed shown that polyurethane is the best coating because of its excellent properties in resisting and preventing microbial influenced corrosion.
Keywords: Metals, Alloy steel, Microbial Influenced Corrosion, Polyurethane, E. coli.