Effect of Some Aliphatic Amines as Corrosion Inhibitors for AZ91 alloy

Ahmed, Saffaa Yehia; Bahaa ‎, Shimaa; Khalifa&lrm;, Omyma; Kasab, Aisha Aisha; Esmail&lrm;, Marwa&lrm;

doi:10.21608/ejchem.2024.290066.9719

Effect of Some Aliphatic Amines as Corrosion Inhibitors for AZ91 alloy

Document Type : Original Article

Authors

¹ Lecturer in Chemistry department, Faculty of Girls for Arts, Science and Education, Ain Shams University, Cairo, Egypt

² Teaching assistant in Chemistry department, Faculty of Girls for Arts, Science ‎and Education, Ain shams University, Cairo, Egypt

³ Professor assistant in Chemistry department, Faculty of Girls for Arts, Science and Education, Ain shams University, Cairo, Egypt &lrm;

⁴ Professor assistant in Chemistry department, Faculty of Girls for Arts, Science and Education, Ain shams University, Cairo, Egypt

10.21608/ejchem.2024.290066.9719

Abstract

The corrosion behaviour of AZ91 alloy was investigated in 0.1M hydrochloric acid solution at different temperatures 20-‎‎50○C. The study was done by weight loss technique and electrochemical method, using Tafel polarization technique. Additive ‎concentration increases the inhibition effectiveness. The results show that the protection efficiency P% followed the sequence ‎ethylenediamine (EDA) > diethylamine (DEA) > ethylamine (EA). The influence of temperature on the corrosion behaviour of ‎AZ91 alloy in 0.1M HCl solution was studied between 20○C and 50○C both with and without inhibitors. The inhibition ‎efficiencies obtained from the two employed methods (weight loss technique and potentiodynamic polarization technique) are ‎nearly closed. From the obtained data, it was found that the inhibition efficiency increases with increasing the inhibitor ‎concentration until the optimum one. Adsorption of the inhibitors on AZ91 alloy surface was found to obey Langmuir’s ‎adsorption isotherm. SEM examination of AZ91 alloy surface revealed that these inhibitors prevented AZ91 from corrosion by ‎adsorption on its surface to form a protective film, which acts as barrier to aggressive agents.‎

Keywords

Main Subjects