Femiana Gapsari, Andita Ganda
The anticorrosion characteristic of the extract of Psidium guajava leaves on aluminum in 3.5 wt% sodium chloride were examined using electrochemical measurement. The thermodynamic factors such as the free energy adsorption, change in enthalpy and entropy were also analyzed. The adsorption isotherm was detail described to study the adsorption of the inhibitor on the aluminum surface with various concentration of the inhibitor. The electrochemical measurement was done through the potentiodynamic polarization test. The results show that the inhibitor act as the mixed type inhibitor and its adsorption on the aluminum surface obey to Temkin adsorption isotherm. The study suggests that the use of Psidium guajava leaves extract for the food industrial application is eco-friendly and safe, especially in salt solution medium. © 2021 Trans Tech Publications Ltd, Switzerland.
Department of Mechanical Engineering, Faculty of Engineering, University of Brawijaya, MT.Haryono 167, Malang, 65145, Indonesia; Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Surabaya, Raya Ketintang, Surabaya, 60231, Indonesia
