Inhibition of Microbiologically Influenced Corrosion of Mild Steel and Stainless Steel 316 by an Organic Inhibitor

Xiao Xia Sheng; Yen Peng Ting; Simo Olavi Pehkonen

doi:10.4028/www.scientific.net/AMR.20-21.379

Paper Titles

Surface Hydrophobicity of an Acidophilic Heterotrophic Bacterium of Mine Origin under Metal Stress
p.362

Selective Coagulation in Chalcopyrite/Pyrite Mineral System Using Acidithiobacillus Group Bacteria
p.366

Combined Atomic Force and Fluorescence Microscopy of Biofilms formed by Leaching Bacteria on Opaque Substrata
p.371

Novel Steel Corrosion Protection by Microbial Extracellular Polymeric Substances (EPS) – Biofilm-Induced Corrosion Inhibition
p.375

Inhibition of Microbiologically Influenced Corrosion of Mild Steel and Stainless Steel 316 by an Organic Inhibitor
p.379

Influence of Growth Substrate and Attachment Substratum on EPS and Biofilm Formation by Acidithiobacillus ferrooxidans
p.385

Study of the Attachment Behaviour of Different Strains of Acidithiobacillus spp. to Pyrite
p.386

Biomining in the Post-Genomic Age: Advances and Perspectives
p.389

Concentrate Mineralogy Dictates the Composition of Bioleaching Microbial Consortia
p.403

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 20-21Inhibition of Microbiologically Influenced...

Inhibition of Microbiologically Influenced Corrosion of Mild Steel and Stainless Steel 316 by an Organic Inhibitor

Abstract:

Microbiologically influenced corrosion (MIC) is a serious problem that continues to plague many industrial systems. In this study, a method to prevent MIC by the use of an azole-type organic compound on the metal substrates was studied. Inhibition of MIC of mild steel and stainless steel 316 by 2-Methylbenzimidazole (MBI) in seawater with sulphate-reducing bacteria (SRB) was investigated using electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM). MBI was shown to be an effective inhibitor in controlling MIC by two strains of sulphate-reducing bacteria: Desulfovibrio desulfuricans, and a local marine isolate. EIS analysis shows an increase in charge transfer resistance for both mild steel and stainless steel 316 after the addition of MBI in the aqueous solution. AFM analyses show a decrease in the surface roughness and pit depth after the addition of MBI. Of the two bacterial strains, it is found that MBI is more effective in the inhibition of corrosion by D. desulfuricans. At a concentration of 1mM, MBI shows a higher MIC inhibition effect on stainless steel 316 (corrosion inhibition 99.5%) than on the mild steel (corrosion inhibition 59.4%). These results indicate that MBI shows potential application in the inhibition of MIC of metal substrates.