Evaluation of microbiologically influenced corrosion inhibition on Ni–Co alloy coatings by Aeromonas salmonicida and Clavibacter michiganensis

► Aeromonas salmonicida and Clavibacter michiganensis protected alloy from corrosion. ► Compact biofilm formation enhanced inhibition efficiency. ► C. michiganensis had the highest inhibiton efficiency value. Microorganisms are able to intensely change the electrochemical conditions at the metal/solution interface by forming biofilms. These changes can result in acceleration of corrosion to corrosion inhibition. In this study microbiologically influenced corrosion inhibition (MICI) has been observed for Ni–Co alloy coatings when two bacteria inoculated to the medium. Experiments were performed in sterile medium and using Aeromonas salmonicida and Clavibacter michiganensis bacteria. After the inoculation of the bacteria, a decrease detected at the Ecorr and Icorr values. Highest inhibition efficiency (ηp and ηi) values were detected for C. michiganensis, as it caused a slower corrosion reaction.