Protection of copper corrosion in acidic medium using pinostrobin

Rosita Wati (2Department of Chemistry, Faculty of Mathematic and Natural Science, University of Mataram, Indonesia)
Saprizal Hadisaputra (Chemistry Education Division, Faculty of Teacher Training and Science Education, University of Mataram)
Dina Asnawati (Department of Chemistry, Faculty of Mathematic and Natural Science, University of Mataram, Indonesia)
Dhony Hermanto (Department of Chemistry, Faculty of Mathematics and Natural Science, University of Mataram. Indonesia)

Acta Chimica Asiana
Vol. 1 No. 2 (2018)

The corrosion inhibition efficiency of copper was tested by the weight loss method in 1 M H2SO4 medium in the presence of pinostrobin as inhibitor. It shows that the addition of pinostrobin inhibitor reduce the corrosion rate. The nature of thermodynamic of pinostrobin adsorption on copper surfaces follows the Freundlich isotherm. The process of inhibition is endothermic, spontaneous and physisorption. It is proved by the Ea, ΔH and ΔS and ΔG values in which the thermodynamic studies show that the values of Ea < 80 kJ.mol-1, ∆H positive, ∆S positive, and ΔG < -20 kJ.mol-1.