Investigation on the Effectiveness of Some Amino Acid Derivatives in Retarding NST 44

Mild Steel Corrosion in Some Agro-Fluids
M. Alagbe
Department of Metallurgical Engineering Institute of Technology
Kawara State Polytechnic, Ilorin, Nigeria
E-mail: alagbemic@yahoo.com
ABSTRACT: This paper presents the report of an investigation and evaluation of the
effectiveness of leucine, alanine, methionine and glutamic acid inhibitors, in retarding NST
44 mild steel corrosion, in the presence of cassava and lime fluids. This work is expected to
provide useful data for the organic inhibitors capable of protecting corrosion of agro-allied
equipment and machinery which had not been possible with inorganic inhibitors because of
their poisonous nature. The results obtained indicate that alanine was observed to be more
efficient than leucine and methione by providing corrosion inhibition at molar concentrations
of 0.20M, 0.30M and 0.30M respectively. However, glutamic acid did not show a reliable
inhibition. Low inhibitor concentration was found to accelerate corrosion substantially in
the presence of cyanide and citric ions.