The influence of temperature on the corrosion inhibition of carbon steel in HCl medium by bark resin of Schinus molle: electrochemical study

The purpose of this work is to investigate the effect of temperature (25 to 65 C°) on the adsorption and inhibition efficiency of Bark resin of Schinus molle for the corrosion of API 5L X70 pipeline steel in 0.5M HCl. Potentiodynamic polarization curves and electrochemical impedance spectroscopy were used to investigate the inhibition behavior of steel in HCl as a function of inhibitor concentration and temperature. The thermodynamic parameters of adsorption were estimated using adsorption theory. The results demonstrate that, at temperatures ranging from 25 to 65 degrees Celsius, bark resin of Schinus molle was an excellent inhibitor for API 5L X70 pipeline steel, with considerably steady inhibitory effectiveness. The greatest inhibitory effectiveness (93%) is achieved at 4 g/L. There is essentially no difference in the corrosion process between the lack and presence of BRSM, regardless of temperature. The adsorption of BRSM on steel surfaces is an exothermic reaction. BRSM adsorption includes physical adsorption. Bark resin of Schinus molle can be used as an environmentally friendly corrosion inhibitor for carbon steel in hydrochloric acid. The stability of BRSM inhibitory efficiency across a temperature range of 25 to 65 C° may find uses in acid pickling, industrial acid cleaning, and acid descaling.