A Study of Natural Rosmarinus Corrosion Inhibitor for Zinc In HCl Solution

Abstract In this study, the effect of important variables on the corrosion rate of Zinc metal was studied with free corrosion, weight loss, and polarization techniques. The test system was designed to measure corrosion potential, corrosion rate, limited current density, and the polarization technique. The experiment used a 0.1M HCl solution as its medium. Temperatures (20,30, 40, 50, and 60) C and rosemary inhibitor concentrations (1 and 5) g/L were used to study the efficacy of the zinc corrosion process. The results showed that the corrosion rate increased with increasing temperature but decreased with increasing inhibitor concentration in acid solution. The maximum inhibition efficiency in Weight Loss Experiments observed at 5g/L of rosemary and 20 °C is 49.07%. The corrosion potential became more negative with increasing temperature and became nobler (less negative) with increasing inhibitor concentration. It has been shown that rosemary is good as a green inhibitor in acid solution.