|Author||Ponmariappan, S. ♦ Maruthamuthu, S. ♦ Palaniappan, R.|
|Source||CSIR-Central Electrochemical Research Institute|
|Publisher||Society for Advancement of Electrochemical Science and Technology|
|Subject Domain (in DDC)||Technology ♦ Engineering & allied operations|
|Subject Keyword||Corrosion Science and Engineering|
|Abstract||Even though Microbiologically Influenced Corrosion (MIC) has been widely studied and reported it is seldom appreciated that, certain type of microorganisms can effectively contribute to inhibition of corrosion process. In the present study the best biofilm forming bacteria such as Staphylococcus sp was isolated from three-month old biofilm on mild steel surface. Mild steel coupons were immersed in cultures of Staphylococcus sp at room temperature. Corrosion inhibition behaviour of pure-culture biofilms of Staphylococcus sp has been evaluated by conventional weight loss method and electrochemical methods like polarization and impedance spectroscopy. A significant reduction in the corrosion rate was observed in presence of Staphylococcus sp. These studies indicate that corrosion inhibition occurs due to the formation of biofilm on the metal surface. Moreover, the mechanism by which the Staphylococcus sp biofilm to inhibit corrosion of mild steel due to the secretion of extra cellular polymeric substances (EPS), and will form a thin layer over the metal surface and prevent the metal from further dissolution. The partial chemical characterization of EPS has been carried out by FTIR and the fatty acids content was analyzed by using a Gas chromatogram. The surface topography of the metal along with Staphylococcus sp was examined by SEM.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
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