Sulfur Isotope Fractionation in Sulfide Corrosion Products as an Indicator for Microbiologically Influenced Corrosion (MIC)

Abstract

Sulfur isotope fractionation was demonstrated in corrosion products resulting from the activities of sulfate-reducing bacteria within biofilms on copper surfaces. 32S accumulated in corrosion products, while 34S was concentrated in the culture medium due to fractionation. The accumulation of the lighter isotope was related to surface derivatization or corrosion as measured by weight loss.

The interaction of bacteria and metal surfaces

“…The validity of the mechanism seems questionable since the concentration of atomic hydrogen is extremely small in the pH range of 5.5-8.5. Little et al [14] have given examples for MIC and also have described the use of different experimental techniques for the evaluation of biofilm formation and MIC.…”

Biocorrosion of AISI 304 Stainless Steel by Desulfovibrio desulfuricans in Seawater

“…1 Seawater, where the concentration of sulfate is typically about 2 g/L, provides an ideal environment for the growth of SRB. 2 Because of the role of SRB in microbiologically influenced corrosion (MIC), much research has been focused on determining the mechanisms of SRB-induced corrosion. To date, there is still divergence of views on the mechanisms of MIC by SRB, especially regarding cathodic and anodic depolarization.…”

“…They have been found on almost all surfaces in seawater, waste/potable water, oil systems, and heat exchangers . Seawater, where the concentration of sulfate is typically about 2 g/L, provides an ideal environment for the growth of SRB . Because of the role of SRB in microbiologically influenced corrosion (MIC), much research has been focused on determining the mechanisms of SRB-induced corrosion.…”

Corrosion behaviour of stainless steel exposed to highly concentrated chloride solutions

“…Most of the OCP values fluctuated in the testing, not showing a steady increase or decrease. The rapid changes in OCP indicate the enhancement of the anodic reaction or the formation of a semiprotective film [30]. In other words, they indicate the breakdown and repassivation of oxide layers that alternatively occurred on the specimens surface.…”