Menu
Search
Filters
Close
Menu

Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!

51318-10586-Mechanistic study of microbiologically influenced corrosion

Picture for A Comparison of Chemistries Intended to Treat Reservoir Souring
Available for download

This study demonstrates that the mechanisms of microbiologically influenced corrosion (MIC) by Desulfovibrio vulgaris, a sulfate reducing bacterium (SRB), against X65 carbon steel and pure copper belong to two different types of MIC.

Product Number: 51318-10586-SG
Author: Jialin Liu / Wenwen Dou / Ru Jia / Xiaogang Li / Sith Kumseranee / Suchada Punpruk / Tingyue Gu
Publication Date: 2018
Industry: Science of Corrosion
$0.00
$20.00
$20.00

This study demonstrates that the mechanisms of microbiologically influenced corrosion (MIC) by Desulfovibrio vulgaris, a sulfate reducing bacterium (SRB), against X65 carbon steel and pure copper belong to two different types of MIC. Type I MIC involves extracellular electron transfer across cell walls of sessile cells in biofilms. This type of MIC is also called extracellular electron transfer MIC (EET-MIC). Type II MIC, also known as metabolite MIC (M-MIC), is caused by secreted corrosive metabolites that are more concentrated locally under a biofilm. The corrosive metabolites secreted by planktonic cells can also contribute to Type II MIC. The metabolites oxidize metals extracellularly without biocatalysis or EET. Experimental data in this work show that 20 ppm (w/w) riboflavin, a universal electron mediator, did not enhance sessile cell growth, but it accelerated EET-MIC by D. vulgaris in the ATCC† 1249 medium against X65 carbon steel with a 90% increase in weight loss and a 284% increase in the average maximum pit depth. However, 20 ppm riboflavin did not increase copper MIC, because copper MIC by SRB was due to secreted metabolites (i.e., M-MIC) rather than the direct result of sulfate reduction. This work also shows that copper MIC weight loss caused by the SRB was at least one order of magnitude higher than that of X65 carbon steel even though the SRB sessile cell count on copper was 10 times lower.

Key words: microbiologically influenced corrosion, mechanism, biofilm, Desulfovibrio vulgaris, carbon steel, copper

This study demonstrates that the mechanisms of microbiologically influenced corrosion (MIC) by Desulfovibrio vulgaris, a sulfate reducing bacterium (SRB), against X65 carbon steel and pure copper belong to two different types of MIC. Type I MIC involves extracellular electron transfer across cell walls of sessile cells in biofilms. This type of MIC is also called extracellular electron transfer MIC (EET-MIC). Type II MIC, also known as metabolite MIC (M-MIC), is caused by secreted corrosive metabolites that are more concentrated locally under a biofilm. The corrosive metabolites secreted by planktonic cells can also contribute to Type II MIC. The metabolites oxidize metals extracellularly without biocatalysis or EET. Experimental data in this work show that 20 ppm (w/w) riboflavin, a universal electron mediator, did not enhance sessile cell growth, but it accelerated EET-MIC by D. vulgaris in the ATCC† 1249 medium against X65 carbon steel with a 90% increase in weight loss and a 284% increase in the average maximum pit depth. However, 20 ppm riboflavin did not increase copper MIC, because copper MIC by SRB was due to secreted metabolites (i.e., M-MIC) rather than the direct result of sulfate reduction. This work also shows that copper MIC weight loss caused by the SRB was at least one order of magnitude higher than that of X65 carbon steel even though the SRB sessile cell count on copper was 10 times lower.

Key words: microbiologically influenced corrosion, mechanism, biofilm, Desulfovibrio vulgaris, carbon steel, copper

Product tags
Also Purchased
Picture for Looking Back and Understanding a Case History of AC Corrosion
Available for download

51318-10603-Looking Back and Understanding a Case History of AC Corrosion

Product Number: 51318-10603-SG
Author: Joe Pikas
Publication Date: 2018
$20.00

A case history of a large diameter pipeline with fusion bonded epoxy coating that experienced AC corrosion within six (6) years while a similar 67-year-old pipeline with coal tar enamel coating experienced none.
Picture for Investigation of the impact of an enhanced oil recovery polymer on microbial growth and MIC
Available for download

51318-10567-Investigation of the impact of an enhanced oil recovery polymer on microbial growth and MIC

Product Number: 51318-10567-SG
Author: Ru Jia / Dongqing Yang / Hasrizal Bin Abd Rahman / Tingyue Gu
Publication Date: 2018
$20.00

A commercial cellulose-based polymer (carboxymethyl cellulose sodium) was tested to see whether it could be utilized by an oilfield biofilm consortium including sulfate reducing bacteria.
Picture for 51318-10544-Cathodic Protection, Coatings that Shield Cathodic Protection, Stress Corrosion Cracking and Corrosion Assessment in Aging Coated Pipe Lines and Buried Utility Structures
Available for download

51318-10544-Cathodic Protection, Coatings that Shield Cathodic Protection, Stress Corrosion Cracking and Corrosion Assessment in Aging Coated Pipe Lines and Buried Utility Structures

Product Number: 51318-10544-SG
Author: Mehrooz Zamanzadeh / George T. Bayer / Anil Kumar Chikkam
Publication Date: 2018
$20.00

Here we would like to elaborate on corrosion risk associated with coatings that shield cathodic protection.
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