Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

Ivana Martinović,Zora Pilić,Gloria Zlatić,Stipe Čelan,Marija Barišić

doi:10.5562/cca3858

Abstract

Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

Highlights

A LUMINIUM and its alloys are one of the most attractive materials for a broad range of uses such as fabrication of cars and marine parts, pipes, construction and aircraft due their low density, high corrosion resistance and high mechanical strength.[1,2,3] High corrosion resistance of aluminium is due the spontaneous formation of a thin oxide film which separates the bare metal from the corrosive environment.[1,2,3] In the contact with acid, alkaline or media with aggressive anions, the protective oxide layer can be destroyed and metal may suffer serious corrosion.[2]
It can be seen that polarization curves show a similar trend, but addition of Alchemilla vulgaris L. extract (AV) extract reduces the corrosion current density indicating adsorption of extract on aluminium surface
Polarization measurements showed that AV extract works as a mixed-type inhibitor

Summary

Introduction

A LUMINIUM and its alloys are one of the most attractive materials for a broad range of uses such as fabrication of cars and marine parts, pipes, construction and aircraft due their low density, high corrosion resistance and high mechanical strength.[1,2,3] High corrosion resistance of aluminium is due the spontaneous formation of a thin oxide film which separates the bare metal from the corrosive environment.[1,2,3] In the contact with acid, alkaline or media with aggressive anions (like Cl–), the protective oxide layer can be destroyed and metal may suffer serious corrosion.[2]. As a result of the increasing awareness of ecological and health risks caused by commercial inhibitors, there is a need to explore ecofriendly and highly efficient corrosion inhibitors Natural products, such as aromatic and medicinal plants, have been used as naturally occurring corrosion inhibitors that are environment friendly, biodegradable, inexpensive and readily available.[1,3,4,5,6,7,8] Protection efficiency of plant extract is attributed mainly to the presence of active compounds, such as phenols, flavonoids, tannins, terpenes, etc., which are known for their antimicrobial, antioxidant and anticorrosion activities. It was found that these molecules adsorb spontaneously on aluminium surface mainly by physical adsorption and inhibition efficiency varied from 70 to 90 %

Methods

Results

Conclusion