Inhibition of the Corrosion of Mild Steel and Aluminium in Acidic Media by Some Purines
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Inhibition of the Corrosion of Mild Steel and Aluminium in Acidic Media by Some Purines

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– Inhibition of the Corrosion of Mild Steel and Aluminium in Acidic Media by Some Purines –

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Abstract

Studies on the corrosion inhibition potentials of adenine (AD), guanine (GU), hypoxanthine (HYP) and xanthine (XN) on mild steel and aluminium in 0.1 M solutions of HCl, H2SO4 and H3PO4 were carried out using electrochemical impedance spectroscopy (EIS), potentiodynamic polarisation and gravimetric techniques.

The study was carried out at 303 and 333 K respectively. The results obtained revealed that AD, GU, HYP and XN had moderate inhibitive effects on corrosion of mild steel in the three acid media in the decreasing order: AD> HYP> GU> XN in HCl; HYP> AD> GU> XN in H2SO4 and GU> AD> HYP> XN in H3PO4 at 303 K.

The results obtained also showed that AD, GU, HYP and XN inhibited the corrosion of aluminium in HCl in the order: GU> HYP> AD> XN.

It was observed that only HYP inhibited the corrosion of aluminium in H2SO4 solution while none of the purines inhibited the corrosion of aluminium in H3PO4 solution. Potentiodynamic polarisation studies showed that the purines surpressed both the anodic and cathodic half reactions of the corrosion processes.

Thereby acting as mixed inhibitors, while impedance data indicated that inhibition was achieved via adsorption of the inhibitor species on the mild steel and aluminium surfaces.

Introduction

1.1 Background of the Study

Corrosion of metals is an electrochemical process that occurs whenever a metal is in contact with an aggressive medium such as acids, bases and salts. The susceptibility of a metal to corrosion depends on the nature of the metal and the environment.

Despite the invention and over-usage of plastics in most industrial applications, metals still rule manufacturing industries. Metals like steel (iron), aluminium, copper, zinc and tin are commonly used in most industries.

Mild steel is one of the best preferred materials for industries due to its easy availability and excellent structural properties. Aluminium on the other hand, is the most abundant metal in the earth’s crust (8.1%), although it is not found free in nature.

The versatility of aluminium makes it the most widely used metal after steel. Most often, during industrial processes such as pickling and etching, these metals come in contact with aggressive media such as acids, bases and salts thereby exposing them to corrosion attack.

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