Within the biosphere every object is influenced by microbial activities. A very unfamiliar case is represented by the microorganisms involved in the process of corrosion of different metals and their alloys. Many workers have reported bacteria responsible for initiating, accelariting and promoting the process of corrosion. While several recent authors have also documented corrosion inhibiting/controlling roles of microorganisms. It appears that like a healthier balance between the normal microbiota and pathogens, required for maintaining health of a host; a comparable balance among the...