Microbiologically influenced corrosion oxidizers

Microbiologically influenced corrosion is defined by the National Association of Corrosion Engineers as any form of corrosion that is influenced by the presence and/or activities of microorganisms. Although MIC appears to many humans to be a new phenomenon, it is not new to the microbes themselves. Microbial transformation of metals in their elemental and various mineral forms has been an essential part of material cycling on earth for billions of years. Some forms of metals such as reduced iron and manganese serve as energy sources for microbes, while oxidized forms of some metals can substitute for... 

Bacterial-environmental interactions, with reference to the cycles of sulfur and other elements, in corrosion on buried pipes are presented based on the recent field and laboratory studies by the author. Attention is focussed on the action of iron bacteria (IB), iron-oxidizing bacteria (lOB), sulfur-oxidizing bacteria (SOB), sulfate-reducing bacteria (SRB) and methane-producing bacteria (MPB). Correlation between the extent of microbiologically influenced corrosion damage and the activities of above mentioned bacteria is also discussed from electrochemical aspects. 

FIGURE 4.22 Filamentous lOB Crenothrix present in bore water. The brown matter is ferric hydroxide from oxidation of iron in steel. (From Boulton L., Microbiologically Influenced Corrosion—Case Studies in Australia, Australasian Corrosion Association, Australia, 2007. With permission.)... 

When considering the quality of a material, we also must consider the type of material (e.g., metal, resin, glass, or ceramic, etc.). In particular, metal materials exposed to different weather events may be oxidized and corroded. Here, I will focus on corrosion. Carbon steel, stainless steel, and alloys are considered metal materials, and these different types of steel may be chosen according to the purpose of the material and the environment in which the material will be used. However, changes in the environment will shorten the lifetime of the material, and the presence and activity of microorganisms can accelerate corrosion this process is called microbiologically influenced corrosion (MIC) [1-5]. Thus, when... 

Microbiologically influenced corrosion (MIC) is used to designate corrosion resulting from the presence and activities of microorganisms within biofilms on a material surface. Such microorganisms can accelerate and control corrosion reactions by several mechemisms formation of differential or concentration cells, formation of metabolites, such as sulfides md organic and inorganic acids metal oxidation and reduction, and deactivation of corrosion inhibitors. 

Kobrin G, Tatnall RE (1993) Introduction a practical manual on microbiological influenced corrosion. NACE International, Houston, pp 68-72 Koenig DW, Mishra SK, Pierson DL (1995) Removal of Burkholderia Cepacia biofilms with oxidants. Biofouling 9 51-62 Kong K, Johnstone DL, Yonge DR, Petersen JN, Brouns TM (1994) Long-term intracellular chromium partitioning with subsurface bacteria. Appl Microbiol Biotechnol 42 403 07... 

Steam and natural waters. Titanium alloys are highly resistant to water, natural waters, and steam to temperatures in excess of 300°C. Excellent performance can be expected in high-purity water and fresh water. Titanium is relatively immime to microbiologically influenced corrosion (MIC). Typical contaminants found in natural water streams, such as iron and manganese oxides, sulfides, sulfates, carbonates, and chlorides do not compromise titanium s performance. Titanium remains totally unaffected by chlorination treatments used to control biofouling. 

Influence of Some Microbiological Species on Corrosion.64 Some bacteria are involved directly in the oxidation or reduction of metal ions, particularly iron and manganese. 

The influence of microbiological organisms can be the initiation of either general or localized corrosion. This influence is because of the effect of organisms to change variables such as pH, oxidizing power, flow velocity, and concentration of chemical species at the metal/solution interface. 

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