| Title | Experimental investigation into the effects of ICCP and scale formation on MIC on HSLA steel |
| Publication Type | Conference Paper |
| Year of Publication | 2012 |
| Authors | Bruin, A, D’Souza, F, Heyer, A, F. Morales, L |
| Conference Name | 16th Annual International Congress on Marine Corrosion and Fouling |
| Date Published | 2012/// |
| Abstract | where bacteria will strike although to a certain extent the risk of corrosion due to microbes could be established.Hence, prevention of MIC is of utmost importance for the assurance of the integrity of materials and in stallations. Cathodic protection (CP) is a corrosion protection system widely used both in the maritime field and in the energy sector and has been found to have influence on MIC processes. The objective of this study was to investigate in a laboratory se tup the effects of continuous impressed current cathodic protection (ICCP) and pre deposit calcareous layer applied through CP, on MIC mixed biofilm of P. fluorescens and D. indonesiensis , on HSLA type 355 steel. Microscope images of surfaces were taken f rom all panels before and after the experiments. Corrosion of panels was assessed through visual observation and light microscopy. Biofilms were assessed using epifluorescence microscopy after staining with 4′,6 diamidino phenylindole ( DAPI). Based on th e results the following conclusions were drawn: CP did not inhibit biofilm formation. In presence of biofilm CP of 1.050 V (Ag/AgCl) showed less or no corrosion on smooth steel surfaces even after two months exposure period, while 0.950 V (Ag/AgCl) cath odically protected steel showed pitting attack within 10 days. Bare steel without a biofilm is protected against corrosion at 0.850 V (Ag/AgCl ). Steel panels with a calcareous layer (developed during 5 days exposure to – 1.050 V (Ag/AgCl)) and subsequent exposure to MIC bacteria showed similar biofilm growth but corrosion attack could not be observed |
