About a century ago, researchers first recognized a connection between the activity of environmental microorganisms and cases of anaerobic iron corrosion. Since then, such microbially influenced corrosion (MIC) has gained prominence and its technical and economic implications are now widely recognized. Under anoxic conditions (e.g., in oil and gas pipelines), sulfate-reducing bacteria (SRB) are commonly considered the main culprits of MIC. This perception largely stems from three recurrent observations. First, anoxic sulfate-rich environments (e.g., anoxic seawater) are particularly corrosive. Second, SRB and their characteristic corrosion product iron sulfide are ubiquitously associated with anaerobic corrosion damage, and third, no other physiological group produces comparably severe corrosion damage in laboratory-grown pure cultures. However, there remain many open questions as to the underlying mechanisms and their relative contributions to corrosion. On the one hand, SRB damage iron constructions indirectly through a corrosive chemical agent, hydrogen sulfide, formed by the organisms as a dissimilatory product from sulfate reduction with organic compounds or hydrogen ("chemical microbially influenced corrosion"; CMIC). On the other hand, certain SRB can also attack iron via withdrawal of electrons ("electrical microbially influenced corrosion"; EMIC), viz., directly by metabolic coupling. Corrosion of iron by SRB is typically associated with the formation of iron sulfides (FeS) which, paradoxically, may reduce corrosion in some cases while they increase it in others. This brief review traces the historical twists in the perception of SRB-induced corrosion, considering the presently most plausible explanations as well as possible early misconceptions in the understanding of severe corrosion in anoxic, sulfate-rich environments.

Corrosion of Iron by Sulfate-Reducing Bacteria: New Views of an Old Problem

Asymmetrical Schiff bases as inhibitors of mild steel corrosion in sulphuric acid media

Experimental and theoretical study for corrosion inhibition of mild steel in normal hydrochloric acid solution by some new macrocyclic polyether compounds

Corrosion inhibition of mild steel in acidic solution by Tagetes erecta (Marigold flower) extract as a green inhibitor

Investigation on some Schiff bases as HCl corrosion inhibitors for carbon steel

The influence of hydrogen sulfide on corrosion of iron under different conditions

Adsorption behaviour of Schiff base and corrosion protection of resulting films to copper substrate

Protection of copper corrosion by modification of self-assembled films of Schiff bases with alkanethiol

Self-assembled monolayers (SAM) of Schiff base N,N′-o-phenylen-bis(3-methoxysalicylaldenimine), designated as V-o-Ph-V, and N-2-hydroxyphenyl-(3-methoxysalicylidenimine), designated as V-b...

Self-Assembled Monolayers of Schiff Bases on Copper Surfaces

Self-assembled monolayers (SAM) of a Schiff base were prepared on a copper surface under different conditions, and the quality and protection ability of resulting films against aqueous corrosion of copper were evaluated by alternating current (AC) impedance technique. Some factors, including surface treatment and applied potentials during and after self-assembly, were investigated. The results indicate that nitric acid (HNO3) etching of the copper prior to adsorption can improve the quality and corrosion inhibition ability of SAM significantly. An appropriately applied potential during self-assembly contributed to the improvement of the quality of SAM, and the long hydrocarbon chain in the molecular structure of the Schiff base enhanced the protection of SAM. Fourier transform infrared (FTIR) reflection spectroscopy and x-ray photoelectron spectroscopy (XPS) were used in the analysis of SAM.

Zhenlan Quan

Papers

The influence of hydrogen sulfide on corrosion of iron under different conditions

Adsorption behaviour of Schiff base and corrosion protection of resulting films to copper substrate

Protection of copper corrosion by modification of self-assembled films of Schiff bases with alkanethiol

Self-Assembled Monolayers of Schiff Bases on Copper Surfaces

Factors Affecting the Quality and Corrosion Inhibition Ability of Self-Assembled Monolayers of a Schiff Base