Gravimetric and Electrochemical Investigation of the Anticorrosion Performance by Polystyrene Coating on E24 Carbon Steel in Acid Medium

Carbon steel is a well-known material and widely used in various industries. One of its major drawbacks is its corrosion in several middle and especially in acid solutions. In this work, we have studied the performance of polystyrene coating at different concentrations on E24 carbon steel against corrosion, in molar hydrochloric acid solution by gravimetric measurements, potentiodynamic polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS) measurements. The effect of coating concentration, immersion time and temperature was examined. The viscosimetric molecular weight of polystyrene was investigated by measuring the intrinsic viscosity.The experimental results showed that the polystyrene coating acts as an effective anticorrosive coating of E24 carbon steel. The value of the protective efficiency reached 87,7% for 4.38 mmol/l of polystyrene coating with gravimetric tests. The stationary and the transient efficiencies reached 89.20% and 80.8% values respectively. The effect of temperature on the anticorrosion behavior of polystyrene film in the range 298-328 K, indicates that protective efficiency decreases with temperature.