Abstract

Both fresh water & salt water can sustain thousands of microscopic and macroscopic
organisms, which have been observed to live and grow on the steel structure rules for plants of
electric power production in sad-haditha. These organisms attach themselves to solid surfaces
during their growth cycle. The accumulation of these organisms causes corrosion directly or
indirectly by deterioration of metal. They assimilate ferrous iron ions and precipitate them into
types of green rusts. Green rust (1) which consists of
FeSO4.7 H2O ,4Fe (OH) 3FeSO4. 4H2O ,Fe (OH)2
While green rust (2) consists of
[4Fe (OH) 2 (2FeOOH .FeSO4 .4H2O)]
The acceleration of corrosion by biological organisms is quite widespread, there has been
relatively little detailed research concerned with the identification of these species especially in
Iraq & and this describes the aim & the scope of this work.