Inhibition of the corrosion of an aluminum alloy by products of microbiological synthesis

1Zin, IM, 1Korniy, SA, 2Karpenko, OV, 1Tymus, MB, 1Khlopyk, OP, 1Pokhmurskii, VI
1Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Lviv
2Lviv Department of Lytvynenko Institute of Physico-Organic Chemistry and Coal Chemistry of the NAS of Ukraine, Lviv
Dopov. Nac. akad. nauk Ukr. 2018, 2:93-101
Section: Chemistry
Language: Ukrainian

The surface-active product of the Pseudomonas sp. PS-17 strain biosynthesis (ramnolipid biocomplex) can provide the effective corrosion inhibition of the mechanically activated surface of aluminum alloys in a synthetic acid rain. The efficiency of the inhibition becomes stronger with increasing the biosurfactant concentration. However, above the critical micelle concentration (CCM), the further improvement in the inhibition is minor. The mechanism of corrosion inhibition consists in the adsorption of biosurfactant molecules on the alloy surface with the formation of a barrier film and in the formation of a low-soluble complex compound by the interaction of rhamnolipids with aluminium ions on anode metal areas. Adding the biosurfactant to the corrosive environment increases the rate of protective film recovery on the aluminum alloy at the repassivation stage by 2 … 4 times as compared with the uninhibited solution.

Keywords: aluminum alloy, biosurfactant, corrosion and electrochemical studies, electronic structure, inhibitor, rhamnolipid
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