Effect of Bacillus subtilis on corrosion behavior of 10MnNiCrCu steel in marine environment

Abstract

Bacillus widely exists in wet natural environment such as soil, water and air, and is often studied as one of representative microorganisms for microbiologically influenced corrosion(MIC) research. In this paper, the growth curve of Bacillus subtilis isolated from marine environment was determined by turbidimetry and its effect on corrosion behavior of 10MnNiCrCu steel was studied by open circuit potential, AC impedance, polarization curve and scanning electron microscopy(SEM). The results showed that with the change of the growth curve of Bacillus subtilis(BS), the open circuit potential(E ocp ) shifted positively and then negatively, and the charge transfer resistance shown by AC impedance was much lower than that of the sterile system, increasing first and then decreasing. The polarization curves showed that the corrosion current density in BS medium was obviously higher than that in sterile system. The corrosion morphology observation showed that although a biofilm by BS developed on the steel surface, the localized corrosion of 10MnNiCrCu steel was aggravated due to the acidness of the metabolite itself and the biofilm with access for electrolyte ions.

The influence of the marine Bacillus cereus over carbon steel, stainless corrosion, and copper coupons

“…Corrosion reduction results were also obtained with the B. subtilis C2 strain after a period of initial corrosion (Wang et al 2020). Other studies conducted with the genera Bacillus and Pseudomonas showed similar results (Xu et al 2017; Li et al 2019).…”

Green Synthesized Silver Nanoparticles Immobilized on Activated Carbon Nanoparticles: Antibacterial Activity Enhancement Study and Its Application on Textiles Fabrics

“…These processes were accompanied by releasing AgNPs from the hydrogen bonding compartments that may have existed on the surface of ACNPs. The bacteria-killing mechanism due to AgNPs itself has already been explained in detail by references [12,15,16,[54][55][56].…”

“…On the other hand, it has been also widely known that both pathogenic bacteria of Bacillus subtilis (B. subtilis), and Escherichia coli (E. coli) as the representatives of Gram-positive and Gram-negative bacteria, respectively, are commonly present ubiquitously in various natural environment bodies such as soil, wastewater, and air [12,13]. Due to these media frequently being in contact with humans, the bacteria can reach the human body and subsequently generate many infectious and various diseases.…”

Potential of sodium dichromate and sodium silicate to control in vitro growth of Bacillus cereus, a metal corrosion-causing bacterium

“…These scientists further reported that corrosions promoted by sulphate-reducing bacteria are 3.5 folds higher than those caused by natural metal oxidation. Acidic compounds (Wang et al 2020) produced by bacteria or bacteria-facilitated extracellular electron transfer (Kato 2016) have been well-documented as the main cause of metal corrosion. Kato (2016) further elaborated on three mechanisms by which microbial extracellular electron transfer (EET) occurs, and these are summarized in Figure 1.…”