N-Substituted amino acids as anticorrosion additives. Part III: N-Acyl amino acids

• J. Telegdi^1,2

¹ Óbuda University, Faculty of Light Industry and Environmental Engineering, Doberdó u. 6., 1034 Budapest, Hungary
² Department of Interfaces and Surface Modification, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, 1117 Budapest, Hungary

Abstract: N-Acylated natural amino acids under neutral conditions were in the focus of corrosion experiments. The influence of the α-side chain in the amino acids as well as the alkyl/aryl part of the acyl moiety on the anticorrosion activity was determined by gravimetric test and visualized by atomic force microscopy. The pH-dependence of the inhibitive character allowed the evaluation of the acidic and alkaline conditions on the corrosion inhibition. The analysis of the efficiencies gave information about the importance of the hydrophobic chains either in the amino acid or in the acyl part and of the other functional groups (carboxyl, chloro substituent). On the basis of these numerous efficacy data one can predict in advance the anticorrosion activity of other acylated amino acids.

Keywords: N-acylated amino acids, anticorrosion activity, pH-dependence, importance of the hydrophobic side chains, influence of other functional groups

Int. J. Corros. Scale Inhib., 2016, 5, no. 3, 263–272 PDF (859 K)
doi: 10.17675/2305-6894-2016-5-3-6

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