This paper summarizes the experience developed during various research work performed using 2024-T3, 7075-T6, and 7005-T6 aeronautical aluminum alloys in different natural and laboratory aqueous media.
The effect on corrosion of the components of a mineral aqueous nutrient medium that supports fungus proliferation was evaluated using an electrochemical technique. Through anodic and cathodic potentiokinetic polarizations, it was possible to determine the susceptibility, type, and relative amount of corrosion damage to the alloys in the medium as well as changes in the medium caused by the metabolic consumption of its components.
The microbiological-influenced corrosion (MIC) effects associated with metallurgical characteristics of the alloys, such as the thermomechanical treatments, secondary phases, and surface roughness, were also determined by means of the polarization tests. These tests are very useful accelerated techniques to evaluate the susceptibility of an aluminum alloy to localized attack in a given environment. They also provide information concerning the morphology and magnitude of the damage.