Inhibitive Properties of Benzyldimethyldodecylammonium Chloride on Microbial Corrosion of 304 Stainless Steel in a Desulfovibrio desulfuricans-Inoculated Medium.

Chung-Wen Hsu,Kai-Yin Lo,Tzu-En Chen,Yueh-Lien Lee

doi:10.3390/ma12020307

Abstract

Biocides are frequently used to control sulfate-reducing bacteria (SRB) in biofouling. The increasing restrictions of environmental regulations and growing safety concerns on the use of biocides result in efforts to minimize the amount of biocide use and develop environmentally friendly biocides. In this study, the antimicrobial activity and corrosion inhibition effect of a low-toxic alternative biocide, benzyldimethyldodecylammonium chloride (BDMDAC), on a 304 stainless steel substrate immersed in a Desulfovibrio desulfuricans (D. desulfuricans)-inoculated medium was examined. Potentiodynamic polarization curves were used to analyze corrosion behavior. Biofilm formation and corrosion products on the surfaces of 304 stainless steel coupons were examined using scanning electron microscopy (SEM), energy-dispersive X-ray spectrum, and confocal laser scanning microscopy (CLSM). Results demonstrated that this compound exhibited satisfactory results against microbial corrosion by D. desulfuricans. The corrosion current density and current densities in the anodic region were lower in the presence of BDMDAC in the D. desulfuricans-inoculated medium. SEM and CLSM analyses revealed that the presence of BDMDAC mitigated formation of biofilm by D. desulfuricans.

Highlights

Influenced corrosion (MIC), which is caused by interactions between various microorganisms, is a long-term concern in many industries, including those involved with underground pipelines, storage vessels, shipping, and marine equipment
To test the antimicrobial activity of benzyldimethyldodecylammonium chloride (BDMDAC), the growth of D. desulfuricans was monitored in different concentrations of BDMDAC
The results reveal that BDMDAC achieved satisfactory results against microbial corrosion by D. desulfuricans in anaerobic conditions

Summary

Introduction

Influenced corrosion (MIC), which is caused by interactions between various microorganisms, is a long-term concern in many industries, including those involved with underground pipelines, storage vessels, shipping, and marine equipment. Reports indicate that MIC was responsible for at least 20% of all damaging corrosion, with a direct cost of $30–$50 billion annually worldwide [1,2]. Among the various types of micro-organisms, SRB are considered the major bacterial group responsible for microbial corrosion under anaerobic conditions [3,4]. Several studies have been conducted to investigate SRB-induced corrosion of iron substrate, and SRB are widely accepted to play a crucial role in the anaerobic MIC of iron, low-alloy steel, and stainless steel [5,6,7,8,9,10,11,12,13,14,15,16,17]. Various mechanisms explain the enhanced corrosion caused by SRB. The primary mechanism sees SRB reduce inorganic sulfate to hydrogen sulfide, resulting in the bulk equation

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