Research on accelerating the corrosion of 7B04 aluminium alloy in the Lacticaseibacillus paracasei environment

Microbially influenced corrosion is one of the main issues of concern in industries due to its significant economic impact. In this work, we focused on Lacticaseibacillus paracasei , a typical microorganism identified in the corrosion products of aircraft fuel systems. The corrosion behavior of the 7B04 aluminum alloy was investigated using electrochemical measurements. The surface morphology was examined using stereomicroscopy and scanning electron microscopy. It was observed that when the Al alloy was immersed in the bacterial system, the impedance value decreased and the corrosion current density increased compared to the sterile system. Furthermore, with increasing immersion time, the pH value was found to be smaller than that in the sterile system, indicating that the acidic metabolic products of the bacteria exacerbated the corrosion. These findings were further supported by surface analyses, and the corrosion mechanism was discussed. Graphical abstract