Evaluation of Allium sativum as corrosion inhibitor for carbon steel in sulphuric acid under hydrodynamic conditions

Green Chemistry Letters and Reviews

E. Rodriguez-Clemente¹ 

关键词: Corrosion;    green inhibitor;    rotating speed;   

DOI  :  10.1080/17518253.2015.1071435

学科分类：化学（综合）

来源: Taylor & Francis

【 摘 要 】

A study on the use of Allium sativum (garlic) as corrosion inhibitor for carbon steel in 0.5 M H2SO4 has been carried out in static and dynamic conditions by using potentiodynamic polarization curves and electrochemical impedance spectroscopy at 0, 200, 500, 1000 and 2000 rpm. Inhibitor concentrations included 0, 100, 200, 400, 600, 800 and 1000 ppm. Under static conditions, inhibitor efficiency increases with increasing its concentration up to 400 ppm, but it decreases with a further increase in its concentration. Under dynamic conditions and short testing times, inhibitor efficiency increases with increasing the rotating speed, due to a better inhibitor transfer towards the steel surface. However, for longer testing times, inhibitor efficiency increases only during the first 2 h, and then it decreases with a further increase in time, indicating a desorption of the inhibitor molecules from the steel surface.

【 授权许可】

Unknown