Effect of magnetite nanoparticle size and concentration on microbiologically influenced corrosion of X70 steel by Desulfovibrio vulgaris

Abstract

This study investigates the impact of magnetic nanoparticle (MNP) size and concentration on the microbiologically influenced corrosion (MIC) of X70 steel, employing electrochemical tests, microscopic characterization, and sulfate concentration measurements. The results show that a 50 ppm concentration of MNPs increased the MIC rate by 122.1%, with particle size having a minimal effect. High concentrations of MNPs significantly reduced anodic electron transfer resistance and enhanced cathodic consumption, thereby accelerating extracellular electron transfer (EET)- mediated MIC of X70 steel. These findings offer crucial insights into the role of magnetite in MIC mechanisms and provide a scientific foundation for improving the management of corrosion in oil and gas pipelines.