Metal is one of the basic need for mankind and metal corrosion causes dramatic problems due to breakdowns in machinery and material leading to loss of man power, material and money. It is estimated that hundreds of thousands crores is lost every year due to corrosion. Currently widely used corrosion control strategies have disadvantages of being expensive, subject to environmental restrictions and sometimes inefficient. Since bacteria can coat metals with a regenerative biofilm, it is becoming evident that they may be used as a means of preventing corrosion. In this present study corrosion behaviour of copper and mild steel (MS) exposed to Luria Bertani Medium has been studied. Tests were performed in sterile media and in the presence of Bacillus sp and Pseudomonas sp bacterial biofilm. A significant corrosion inhibition was observed in the media in the presence of the biofilms. Biofilms of Bacillus sp and Pseudomonas sp developed on copper and mild steel was known to inhibit corrosion, that the samples remained untarnished and unattacked. But the samples which were exposed to sterile media was attacked and covered with a dark film of corrosion products. The results suggested that the bacterial biofilms can inhibit corrosion, and it can be a feasible and effective method of natural means of corrosion inhibition.

Metals, Corrosion inhibition, Bacillus sp, Pseudomonas sp, Copper, Mild Steel (MS).