The corrosion behavior of anodized and non-anodized aluminum alloy 6061 in the presence of Aspergillus niger fungus was studied using electrochemical noise, recurrence plots and electrochemical impedance spectroscopy techniques. Corrosion potential measurements were also obtained. The fungus generated organic acids causing microbially induced corrosion of the specimens, which was more evident on non-anodized than on anodized aluminum alloy 6061, showing uniform and localized corrosion and a change in the attack as a function of the fungus growth time. A biomass growth curve was obtained to compare the behavior of anodized and non-anodized aluminum alloy 6061. A long-term electron transfer mechanism was proposed for localized corrosion of aluminum alloy 6061. Figure shows impedance plots of non-anodized aluminum alloy AA 6061 in the presence of Aspergillus niger at 2, 6, 8 and 15 days, and electrical equivalent circuit model used to fit impedance data (upper part), where Rs corresponds to the solution resistance, CPE is a constant phase element, R1 is the charge transfer resistance, R2 and C correspond to adsorption-desorption and surface coverage processes, respectively. The shape of the impedance diagrams is similar for the four experimental times, a capacitive behavior showing a depressed semicircle at high frequency (from 10 kHz to ∼0.1 Hz), with the center lying below the real axis, and an inductive behavior showing a loop below the real axis at low frequencies (from ∼0.1 Hz to 0.05 Hz), which is a typical loop shape of an adsorption process and may be associated with the adherence of spores to the metallic surface, originating differential aeration cells which may produce localized corrosion. Display omitted •Corrosion of aluminum alloy 6061 in the presence of A. niger was studied.•A. niger generated citric acid causing corrosion on aluminum alloy 6061 specimens.•The highest corrosion at day 8 corresponding to the maximum microorganism growth.•Biomass growth curves for anodized and non-anodized aluminum alloy 6061 specimens.