Multi-Lateral Defense Science Partnering to Investigate Fundamental Bio-Electrical Chemical Interaction Mechanism of Aerospace Materials
Abstract
Microbiologically influenced corrosion (MIC) have been widely studied because the phenomenon can promote the localized degradation of metallic materials exposed to many different environments. The present work is a study focused on the electrochemical behavior of Aluminium alloy (AA) 2024-T3 exposed to a sterile and inoculated simulated saline medium. The bacteria were collected from corrosion products of Thailand aircraft. The 16S ribosomal RNA sequence results show a closely related to Bacillus genus (Gram positive), as Bacillus safensis (~99.68 %), and Bacillus pumilus (~99.73 %). The influence of different bacteria attached on the AA2024-T3 surface was evaluated using electrochemical techniques, such as linear sweet voltammetry and impedance spectroscopy at open circuit and cathodic overpotential. Electrochemical results suggest (a) a change of the double layer capacitance in presence of bacteria, and (b) a substantial disparity in the electrochemical response in the cathodic reaction of AA2024-T3 influenced by microorganisms, indicating that the inoculated media promote the catalysis of a redox half-reaction of oxygen reduction to water.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 17, 2020
- Accession Number
- AD1108836
Entities
People
- Nelson Vejar
Organizations
- Aeronautical Polytechnic Academy