Menu
Search
Filters
Close
Menu

07513 Effect of Cathodic Protection on Biofilm Formation and Maturation

Picture for 07513 Effect of Cathodic Protection on Biofilm Formation and Maturation
Available for download
Product Number: 51300-07513-SG
ISBN: 07513 2007 CP
Author: Yasunori Tanji, Hirofumi Kawai, Ryosuke Terashi, and Kazuhiko Miyanaga
Publication Date: 2007
$0.00
$20.00
$20.00
Cathodic protection (CP) is known as a reliable method to protect steel from corrosion. However, the influence of CP on biofilm formation and maturation is not well known. There are three possible effects of CP on biofilm formation and maturation. Those are: 1) deprivation of anchorage sites for bacterial adhesion, 2) increase of electrostatic repulsion between the steel surface and negatively charged bacteria, 3) elimination of bacteria in the biofilm by increasing pH. To investigate these possible effects of CP on biofilm, carbon steel coupons were immersed in artificial seawater with and without CP. CP retarded steel corrosion, as a consequence of inhibition of biofilm formation. CP also inhibited initial attachment of Pseudomonas aeruginosa PAO1, a strain well known for its negative charge and pioneering adhesive characteristics. Since the inhibitive effect of cell adhesion was greater in low ionic conditions than in high ionic conditions, CP increased electrical repulsion between the steel surface and bacteria. The increase of pH in an artificial biofilm composed of 0.5% agar and 0.9% NaCl was also investigated theoretically and experimentally. The pH profile in the artificial biofilm was analyzed using a capillary pH electrode. After three hours of CP, the biofilm pH increased and as a consequence sterilized P. aeruginosa PAO1 imbedded in the film. However, pH at the edge of the biofilm decreased sharply and reached the same value as that in the bulk-water. Therefore, bacteria located at the edge of the biofilm survived during the application of CP.
Cathodic protection (CP) is known as a reliable method to protect steel from corrosion. However, the influence of CP on biofilm formation and maturation is not well known. There are three possible effects of CP on biofilm formation and maturation. Those are: 1) deprivation of anchorage sites for bacterial adhesion, 2) increase of electrostatic repulsion between the steel surface and negatively charged bacteria, 3) elimination of bacteria in the biofilm by increasing pH. To investigate these possible effects of CP on biofilm, carbon steel coupons were immersed in artificial seawater with and without CP. CP retarded steel corrosion, as a consequence of inhibition of biofilm formation. CP also inhibited initial attachment of Pseudomonas aeruginosa PAO1, a strain well known for its negative charge and pioneering adhesive characteristics. Since the inhibitive effect of cell adhesion was greater in low ionic conditions than in high ionic conditions, CP increased electrical repulsion between the steel surface and bacteria. The increase of pH in an artificial biofilm composed of 0.5% agar and 0.9% NaCl was also investigated theoretically and experimentally. The pH profile in the artificial biofilm was analyzed using a capillary pH electrode. After three hours of CP, the biofilm pH increased and as a consequence sterilized P. aeruginosa PAO1 imbedded in the film. However, pH at the edge of the biofilm decreased sharply and reached the same value as that in the bulk-water. Therefore, bacteria located at the edge of the biofilm survived during the application of CP.
Product tags
Also Purchased
Picture for 10034 Cathodic Protection - It's All About Current
Available for download

10034 Cathodic Protection - It's All About Current

Product Number: 51300-10034-SG
ISBN: 10034 2010 CP
Author: Dennis Janda
Publication Date: 2010
$20.00
Picture for Cathodic Protection and MIC - Effects of local electrochemistry
Available for download

Cathodic Protection and MIC - Effects of local electrochemistry

Product Number: 51317--9452-SG
ISBN: 9452 2017 CP
Author: Stefan Jansen
Publication Date: 2017
$20.00

The goal of this research was to improve the understanding of the mechanisms of cathodic protection (CP) by determining the interactions between corrosion and local chemical parameters, such as pH, under varying CP conditions, both in the absence and presence of MIC.
Picture for 98651 INTERMITTENT CATHODIC PROTECTION USING
Available for download

98651 INTERMITTENT CATHODIC PROTECTION USING SOLAR POWER

Product Number: 51300-98651-SG
ISBN: 98651 1998 CP
Author: Richard J. Kessler, Rodney G. Powers, Ivan R. Lasa
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support