CORROSION-ELECTROCHEMICAL BEHAVIOUR OF 20 STEEL IN SOME INHIBITING 5% ACID SOLUTIONS

Abstract

It has been shown that the extract of nut-shell (Juglands regia L) in concentration 1…3 g/l protect 20 steel against
corrosion in 5% hydrochloric and lemon acids in 298 – 333o K temperature diapason by 87% and 54% respectively. More
highly efficiency of extract in HCl may be result of chlorid – ion synergetic influence. Electrochemical investigations
confirmed the difference in its protective action in dependence of acid type, although extract of nut-shell in those acids is the
inhibitor of mixed action with prevalence of inhibition of anodic reaction.