Extraction of essential oil from Artemisia herba alba and it application in the protection of Aluminum in HCl medium

摘要

Acids play a very important role in the industry especially in (scrubbing, industrial cleaning, acid scaling, etc.). However, the action of these agents alters metals and can sometimes, in addition to cost, lead to serious accidents. The use of corrosion inhibitors to combat this phenomenon is effective, however synthetic compounds are highly toxic and most of them are banned. As a result, the use of oils and plant extracts has aroused the interest of the scientific community as a good source of "green" inhibitors. It is within this framework that our present study is taking place. Indeed, starting from a green plant in this case the white artemisia, picked in the east of Algeria, the essential oil is extracted to study its effectiveness with respect to the corrosion of pur aluminium in HCl 1mol. L~(-1). The extraction of the oil was carried out by hydrodistillation with an efficiency of (0.9 - 1.1%), the extract obtained was then characterized by gas chromatography coupled with mass spectroscopy. The study of the electrochemical behavior of aluminum in hydrochloric medium in the presence of this extract (temporal variation of the abandonment potential, potentiodynamic polarization, electrochemical impedance spectroscopy and gravimetric measurements allowed us to demonstrate an inhibitory efficiency of 95% and the extract acts as cathodic inhibitor.