Investigation of Waste of the Caprolactam Production as Steel Corrosion Inhibitor in Hydrochloric Acid

Abstract

Waste of the caprolactam production that is the POD-oil (Product of Oxidizing and Dehydrogenation) is investigated by gravimetric, potentiodynamic and impedance spectroscopy techniques. It is shown that dimer of hexanon (dianone) is the basic inhibiting component of the POD-oil. It is demonstrated that the POD-oil retards mainly the anodic reaction. The corrosion process is simulated by a parallel connection of the corrosion resistance and the element with constant phase at value of the exponential factor n = 0.71 - 0.86. The efficiency of the investigated inhibitor reaches 85 - 88% at 1 mass % concentration of the inhibitor.