ABSTRACT
A number of bacteria have been identified that aggravate corrosion of metals such as carbon steels, cast irons, stainless steels, aluminum alloys, and copper alloys. These are classified as aerobic and anaerobic according to their ability to grow in the presence or absence of air. They survive under a wide range of temperature (0-50°C) and pH (3-10). The important microorganisms contributing to corrosion are listed in Table 3.5. The affected areas are characteristically associated with excessive deposits, tubercles, or biological slimes. Buried grayiron structures suffer from graphitic corrosion (Section 3.7.3) where bacteria help in the process of leaching out of iron.
