Inhibition of Microbial Corrosion, Caused by Sulfate-Reducing Bacteria, by Heterocyclic Amines and Substances, Composed on Their Basis
DOI:
https://doi.org/10.20535/1810-0546.2015.6.52770Keywords:
Microbiological corrosion, Sulfate-reducing bacteria, Polarization resistance, Carbon steel, Quaternary pyridinium salt, Benzotriazole, Calcium salt, Magnesium saltAbstract
Background. Microbial corrosion, caused by sulfate-reducing bacteria (SRB), is one of the dangerous kinds of iron and steeldestruction. However, today there are only a small number of compounds, which are used as inhibitors of microbial corrosion are known.
Objective.The objective is to study the effect of nitrogen-containing heterocyclic compounds and their combination with the metal salts in the carbon steel corrosion in salt solution containing SRB and determination of mechanisms of their protective action.
Methods. Research was carried out with mass-metrical, electrochemical and microbiological methods with carbon steel in chloride salt electrolytes, the culture of “Kiev 10” and organic and inorganic compounds.
Results.The compositions of benzotriazole with calcium and magnesium salts are the most effective in 3 % NaCl solution and quaternary pyridinium salts practically make no influence on corrosion of steel. Protective effect of quaternary pyridinium salts is substantially increased and the degree of protection of steel in anaerobic conditions reaches 98 % at the transition to the inoculated salt solution. It was established that increase of the efficiency is caused by the changing nature of the cathodic reaction of corrosion process, by high antibacterial properties of organic compounds and the synergistic effect of metabolic products of SRB.
Conclusions. Quaternary pyridinium salts and benzotriazole compositions with calcium and magnesium salts demonstrate high protective properties in steel corrosion in salt solutions containing SRB. The degree of protection is achieved by 90–98 %.
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