Experimental study and mathematical modelling of the corrosi-on inhibition of mild steel with an organic compound in 1 M HCl

Wafia Boukhedena ,Samir Deghboudj

doi:10.5599/jese.1050

Abstract

In this paper, synthesized organic compound of the family of ketene dithioacetal was studied as corrosion inhibitors for mild steel in 1.0 M hydrochloric acid by gravimetric measurement. The aim of this work is to study the effect of inhibitor concentration and the temperature on the resistance, corrosion and to compare the experimental results with mathematical models. The structural properties were performed using scanning electron microscopy technique. It has been found that the inhibition efficiency, increases with increasing inhibitor concentration. The adsorption of studied compounds on mild steel surface follows Langmuir’s isotherm. Obtained data were analyzed by suggesting two mathematical models based on linear and quadratic regression, taking into account the influence of concentration and temperature on the inhibition efficiency. Obtained experimental data were in good agreement with those predicated by the quadratic model

Highlights

The use of organic inhibitors for the control of corrosion of metals and alloys is of practical importance for many industrial applications, where acid solutions are commonly used in several processes
Mass loss measurements Corrosion of mild steel in 1 M HCl in the absence and presence of various concentrations (5×10-6, 10-5, 5×10-5, 10-4, 5×10-4 and 10-3 M) of PDDY was studied by weight loss experiments at various temperatures (20, 30, 40, 50 and 60 °C)
That corrosion rate increased with temperature and decreased with inhibitor concentration

Summary

Introduction

The use of organic inhibitors for the control of corrosion of metals and alloys is of practical importance for many industrial applications, where acid solutions are commonly used in several processes. Hydrochloric acid is one of the most widely used for pickling, and chemical and electrochemical etching of some metals and alloys [1]. The use of corrosion inhibitors is considered as the most effective method for the protection of many metals and alloys against acid attack [2,3,4,5,6,7]. Inhibitors are employed to reduce the dissolution rate of metals.

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