In microbiologically influenced corrosion (MIC) caused by sulfate-reducing bacteria (SRB), extracellular electron transfer (EET) between metals and microorganisms affects the metal corrosion process. In this work, the effect of the electron mediator riboflavin on the EET-MIC behavior of 2024 aluminum alloy (AA2024) was investigated by electrochemical methods, surface analysis techniques, focused ion beam, scanning electron microscopy, and x-ray photoelectron spectroscopy techniques. The results showed that the electron mediator was significantly able to accelerate SRB attack against AA2024. SRB utilized to consume H+ to accelerate its own metabolism and promoted the corrosion of AA2024, resulting in the formation of corrosion product AlOOH and Al(OH)3. The addition of electron mediator riboflavin increased the electron transfer efficiency and affected the reaction rate constant to accelerate the corrosion rate of aluminum alloy. The addition of 10 ppm riboflavin led to denser corrosion product biofilms on the surface of the aluminum alloy, which accelerated the formation of NaAlO2. Cl− diffused into the film layer through the pores of the surface of the aluminum alloy and was adsorbed into the film layer to induce pitting corrosion on the surface of the aluminum alloy. A large amount of SRB was attached, which resulted in an increasing pit depth on the surface of the aluminum alloy. Riboflavin accelerated the electron transfer process from the surface of the aluminum alloy across the cell wall to the cytoplasm, which led to serious corrosion of the aluminum alloy. The distribution of SRB in biofilm and the longitudinal distribution of bacteria in the process of pitting corrosion showed that the addition of electron mediators increased the depth of pits in aluminum alloys. Bacteria in the pitting area gathered at the bottom of the biofilm, and the pits were rich in Ca, P, and other elements.
Skip Nav Destination
Article navigation
1 February 2023
Research Article|
December 13 2022
Influence of Electron Mediator on Microbiologically Influenced Corrosion Behavior of 2024 Aluminum Alloy
Qingmiao Ding;
Qingmiao Ding
*Civil Aviation University of China, Tianjin, 300300, People’s Republic of China.
Search for other works by this author on:
Ruiyang Liu;
Ruiyang Liu
‡
*Civil Aviation University of China, Tianjin, 300300, People’s Republic of China.
‡Corresponding author. E-mail: lry13752081811@163.com.
Search for other works by this author on:
Yanyu Cui;
Yanyu Cui
*Civil Aviation University of China, Tianjin, 300300, People’s Republic of China.
Search for other works by this author on:
Qun Yan;
Qun Yan
*Civil Aviation University of China, Tianjin, 300300, People’s Republic of China.
Search for other works by this author on:
Xiaoman Li
Xiaoman Li
*Civil Aviation University of China, Tianjin, 300300, People’s Republic of China.
Search for other works by this author on:
CORROSION (2023) 79 (2): 146–156.
Citation
Qingmiao Ding, Ruiyang Liu, Yanyu Cui, Qun Yan, Xiaoman Li; Influence of Electron Mediator on Microbiologically Influenced Corrosion Behavior of 2024 Aluminum Alloy. CORROSION 1 February 2023; 79 (2): 146–156. doi: https://doi.org/10.5006/4111
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
Sign in via your Institution
Sign in via your Institution
43
Views
Citing articles via
Viability of Cathodic Protection for Preventing Corrosion of SS316H in Molten LiF-NaF-KF
Krishna Moorthi Sankar<span class='al-author-delim'>, </span>Preet Singh
Impact of fireside corrosion on creep rupture life and oxide scale structure of Super304H boiler tube
Xiaofeng Yang<span class='al-author-delim'>, </span>Yaxin Xu<span class='al-author-delim'>, </span>jintao lu<span class='al-author-delim'>, </span>Dangdang Ying<span class='al-author-delim'>, </span>Jinyang Huang<span class='al-author-delim'>, </span>Wenya Li
Optimizing Sour Gas Qualification Testing – Modeling the Effects of Temperature and Total Pressure on H<sub>2</sub>S Fugacity, Activity, and Solubility Coefficients
BRENT SHERAR<span class='al-author-delim'>, </span>Diana Miller<span class='al-author-delim'>, </span>Hui Li
Performance of a volatile corrosion inhibitor for mitigating corrosion under insulation
Yang Hou<span class='al-author-delim'>, </span>Thunyaluk Pojtanabuntoeng<span class='al-author-delim'>, </span>Mariano Iannuzzi<span class='al-author-delim'>, </span>Mike Rajagopal