The effects of coating defect, cathodic protection, and sulphate-reducing bacteria on corrosion of EH40 steel

The effects of coating defect, cathodic protection (CP), and sulphate-reducing bacteria (SRB) on EH40 steel corrosion were investigated in seawater. Results showed that the presence of - 0.85 VCSE and SRB result in the current density fluctuate around 0 mu A center dot cm- 2 for EH40 steel with different coating defects. EH40 steel corrosion with coating defect of 0.2 mm is inhibited, but promoted with 1.0 mm and 2.0 mm under effects of - 0.95 VCSE and SRB. The CP of - 0.95 VCSE and current density of - 0.6 mu A center dot cm- 2 inhibit adhesion of SRB on EH40 steel with coating defect of 0.2 mm.