Menu
Search
Filters
Close
Menu

Severe microbiologically influenced corrosion (MIC) of pure zinc and galvanized steel in the presence of Desulfovibrio vulgaris

Picture for Severe microbiologically influenced corrosion (MIC) of pure zinc and galvanized steel in the presence of Desulfovibrio vulgaris
Available for download

Zinc and its alloys are used as sacrificial anodes because zinc is an active metal. Carbon steel can be coated with zinc to protect against corrosion. These metals are known as galvanized steel. In this work, microbiologically influenced corrosion (MIC) of pure zinc and galvanized steel caused by a sulfate reducing bacterium was investigated. After 7 days of incubation in 125 mL anaerobic vials with 100 mL culture medium and 1 mL inoculum, the sessile cell count on the galvanized steel was slightly higher than that on pure zinc. The abiotic weight loss for pure zinc was 1.4 ± 0.1 mg/cm2 vs. 4.6 ± 0.1 mg/cm2 for galvanized steel after 7 days of anaerobic incubation at 37oC. The weight losses for galvanized steel and pure zinc were 31.5 ± 2.5 mg/cm2 and 35.4 ± 4.5 mg/cm2, respectively, which were 10X larger than the previously reported carbon steel weight loss in the same SRB broth. Electrochemical corrosion tests confirmed the severe corrosion of these two metals. The corrosion current densities of galvanized and pure zinc were 25.5 µA/cm2 and 100 µA/cm2, respectô€€€vely at the end of the 7-day incubation with SRB, confirming that pure zinc was more prone to SRB MIC than galvanized steel. In both cases, the corrosion product was mainly ZnS. Three MIC mechanisms were possible for the severe corrosion. Extracellular electron transfer MIC is thermodynamically favorable for Zn. Furthermore, the detection of H2 evolution in the vials suggest that proton attack and H2S attack occurred against Zn in the SRB broth with neutral pH after passive film damage by the SRB biofilm. 

Product Number: 51320-14537-SG
Author: Di Wang, Tuba Unsal, Tingyue Gu, Sith Kumseranee, Suchada Punpruk
Publication Date: 2020
$20.00
$20.00
$20.00
Product tags
Also Purchased
Picture for TM0212-2012
Available for download

TM0212-2018-SG Detection, Testing, and Evaluation of Microbiologically Influenced Corrosion on Internal Surfaces of Pipelines

Product Number: 21260-SG
ISBN: 1-57590-255-9
Publication Date: 2018
$109.00

Standard test method for microbiologically influenced corrosion (MIC) on internal surfaces of pipelines. Types of microorganisms, MIC mechanisms, sampling and testing. Research results, and interpretation of test.
Picture for TM0106-2016
Available for download

TM0106-2016-SG, Detection, Testing, and Evaluation of Microbiologically Influenced Corrosion (MIC) on External Surfaces of Buried Pipelines

Product Number: 21248-SG
ISBN: 1-57590-206-0
Publication Date: 2016
$109.00

Types of microorganisms and mechanisms by which MIC occurs on external surfaces of buried, ferrous-based metal pipelines.  Testing for the presence of bacteria, research results, and interpretation.
Picture for 98276 SELECTION OF CORROSION INHIBITORS
Available for download

98276 SELECTION OF CORROSION INHIBITORS TO CONTROL MICROBIOLOGICALLY INFLUENCED CORROSION

Product Number: 51300-98276-SG
ISBN: 98276 1998 CP
Author: Rupi Prasad
$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