How Sulfate Reducing Bacteria Impact Corrosion

What are Sulfate Reducing Bacteria?

Sulfate-reducing bacteria (SRB) are anaerobic microorganisms using sulfates as terminal electron acceptors in respiration. They occur naturally in anaerobic marine and freshwater environments and can produce hydrogen sulfide gas, which is toxic to humans and animals. SRB also can corrode metals by releasing acidic compounds such as sulfuric acid.

How does Sulfate Reducing Bacteria Cause Corrosion?

SRB produce sulfuric acid through their metabolic processes, leading to accelerated metal surface corrosion. This process is known as microbial-induced corrosion (MIC). SRBs are estimated to contribute up to 80% of all microbial-induced corrosion in natural environments.