Environmentally friendly inhibitor of the corrosion of mild steel: Commercial oil of Eucalyptus

Abstract

A study assessing plant extracts as green corrosion inhibitors is important because of the potential cost effective and environmental benefits. This study employed a strategy to evaluate the effectiveness these molecules against corrosion of mild steel in acid media. Many plant extracts have been used as corrosion inhibitors of iron or steel in acidic media. This research aims to examine the effects of commercial oil of Eucalyptus on inhibition of corrosion with mild steel in hydrochloric acid by means of gravimetric, potentiodynamic polarization and electrochemical impedance spectroscopic measurements. The results of the polarization curves show that the corrosion current density decreases from 3618 A/cm 2 to 87 A/cm 2 with the addition of the Eucalyptus inhibitor. The charge transfer resistance increases from 17 Ohm•cm 2 to 185 Ohm•cm 2 in the electrochemical impedance spectrum after the addition of the oil Eucalyptus inhibitor in the more concentrated solutions It is found that the adsorption of our green inhibitor on steel surface obeys the Langmuir adsorption isotherm equation. The inhibition efficiency was found to be increased with increasing immersion time of samples in the solution. The polarization plots indicate that the studied Eucalyptus inhibitor affects both the anodic metal dissolution, and the catholic hydrogen evolution acting as a mixed type inhibitor.

Electrochemical Sensors for Controlling Oxygen Content and Corrosion Processes in Lead-Bismuth Eutectic Coolant—State of the Art

“…At the moment, the Electrochemical Impedance Spectroscopy method is widely used to monitor the corrosion processes in various environments [ 68 , 69 , 70 , 71 , 72 ]. This method is used to study the structure of corrosion deposits and the mechanism of their formation [ 73 ], the resistance of coatings on the surface of materials [ 74 ] and the effectiveness of corrosion inhibitors [ 75 ]. The advantage of the Impedance Spectroscopy method is its ability to track changes in the state of the metal/liquid metal interface, which is extremely important in the case of using oxide films to inhibit corrosion processes in LBE.…”

Stress Corrosion Cracking and the Effects of <i>Citrus x aurantiifolia</i> on Mild Steel - A Green Approach

“…Plant extract is analyzed as an extremely rich source of natural synthesized chemical compound extracted at low cost with simple procedures. The data obtained from literature show that plant extract can serve as non-toxic inhibitor; oil of Eucalyptus, basil oil, clove seed extract, Chamaerops humilis L. fruit extract,Epiphyllum oxypetalum extract, Magnolia grandiflora leaves extract, Peganum harmala seed extract, chicken nail extracts, almold extract, Allium sativum extracts, Persian Liquorice extract [6][7][8][9][10][11][12][13][14][15][16]. Interestingly, plant extracts are known to be of low cost, biodegradable, readily available, and eco-friendly.…”