Guanidine-containing alkyl-substituting oligomer as a metal corrosion inhibitor

Keywords

microbial corrosion inhibitors, guanidine-containing alkyl-substituted oligo¬mer, sulfate-reducing bacteria.

Cite as

Abdulina D. R., Vortman M. Ya., Iutynska G. A., Purish L. M., Kopteva Zh. P., Kopteva G. E., Lemeshko V. N., and Shevchenko V. V. Guanidine-containing alkyl-substituting oligomer as a metal corrosion inhibitor. Physico¬chemical Mechanics of Materials. 2022. 58(5), 017-022.

Abstract

Guanidinium-containing oligomer based on aliphatic oligoepoxide is a newly synthesized substance with known bactericidal action, which is prospective as an inhibitor of microbial corrosion. The aim of this work is to synthesize the oligomeric alkyl-substituted guanidinium bromide and to study its anticorrosive properties for steel in the presence of corrosive aggres­sive sulfate-reducing bacteria (SRB). The effectiveness of the new compound with previ­ously studied inhibitors – DPH (quarter ammonium compound based on N-decylpyridinium chloride) (KPI, Ukraine) and Armohib CI-28 (based on Diamine Ethoxylate) (Akzonobel, Holland) is studied. The guanidinium oligomer has been shown to have biocidal properties. The introduction of the oligomer gives a significant inhibition of bacterial growth, after the end of the exposure period in the environment only dozens of cells are found. The corrosion rate of steel in the presence of SRB without the introduction of inhibitors is 0.15–0.35 mg/(cm²·h). The addition of DPH leads to a decrease in the corrosion rate of steel to 0.032–0.047 mg/(cm²·h) (6.5–10.6 times). The addition of Armohib CI-28 reduces the corrosion rate to 0.027–0.039 mg/cm²·h (4.2–12.7 times), and the addition of the oligomer to the culture medium reduces the corrosion rate to 0.075–0.079 mg/(cm²·h) (2.5–2.7 times). According to the loss of mass of steel samples, the degree of the metal protection from microbial corrosion in the presence of guanidinium oligomer is 60.15–63.17%. So, the guanidine-containing oligomer based on aliphatic oligoepoxide has biocidal and anti-corrosion properties and is promising for use as a means of combating microbial induced corrosion.

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