Understanding the origin of high corrosion inhibition efficiency of bee products towards aluminium alloys in alkaline environments

Jacek Ryl , Joanna Wysocka , Mateusz Cieslik , Husnu Gerengi , Tadeusz Ossowski , Stefan Krakowiak , Paweł Niedziałkowski

Abstract

Various bee products were found to be efficient corrosion inhibitors of aluminium in different environments. In particular, bee pollen was found to be highly effective in alkaline electrolytes, yet its highly complex composition and possible synergistic interactions hinder determination of the compounds acting as active corrosion inhibitors. The main purpose of the following work is to investigate the effect of solvents used for pollen extraction process on the corrosion inhibition of AA5754 alloy in alkaline environment. Both infrared and mass spectroscopies as well as chromatographic analysis were used to determine differences in the composition of each obtained extract. The inhibition efficiency (IE%) of each extract was determined by using the potentiodynamic polarization and impedance studies. The highest IE%, exceeding 90% at 10 gL-1, was recorded for the water/ethanol extract. Most importantly, it has been found that the dichloromethane extract containing less polar compounds enhanced the corrosion rate at low bee pollen concentrations, and offered lower inhibition efficiency at the concentrations above 10 gL-1. The adsorption isotherms were drawn based on dynamic impedance spectroscopy in galvanostatic mode (g-DEIS), while the measurements carried out at elevated temperatures allowed the construction of Arrhenius plots and, consequently, the confirmation of the physical mechanism of adsorption.
Author Jacek Ryl
Jacek Ryl,,
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, Joanna Wysocka
Joanna Wysocka,,
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, Mateusz Cieslik
Mateusz Cieslik,,
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, Husnu Gerengi
Husnu Gerengi,,
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, Tadeusz Ossowski (FCh / DACh / LSCh)
Tadeusz Ossowski,,
- Laboratory of Supramolecular Chemistry
, Stefan Krakowiak
Stefan Krakowiak,,
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, Paweł Niedziałkowski (FCh / DACh / LSCh)
Paweł Niedziałkowski,,
- Laboratory of Supramolecular Chemistry
Journal seriesElectrochimica Acta, ISSN 0013-4686, (A 40 pkt)
Issue year2019
Vol304
Pages 263-274
Publication size in sheets1.75
Keywords in EnglishCorrosion inhibition, aluminium alloys, green chemistry, surface analysis, adsorption, dynamic impedance spectroscopy
ASJC Classification1603 Electrochemistry; 1500 General Chemical Engineering
DOIDOI:10.1016/j.electacta.2019.03.012
URL https://doi.org/10.1016/j.electacta.2019.03.012
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 15-04-2019, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 15-04-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.101; WoS Impact Factor: 2017 = 5.116 (2) - 2017=4.857 (5)
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