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Abstract
The corrosion behavior of copper, aluminum and stainless steel AISI 316L in 0.5 mol dm-3 NaCl solution without and with the addition of an aqueous-ethanol extract of green tea leaves at a temperature of 25 °C was investigated. Electrochemical parameters where determined by linear polarization measurements and potentiodynamic polarization method, and the surface of the metal samples were investigated using an optical microscope after the polarization measurements. Results have shown that green tea extract acts as a corrosion inhibitor for copper aluminum and stainless steel.
Highlights
Metals, such as copper, aluminum, and its alloys along with stainless steels, are used in almost all spheres of human activity today
Electrochemical parameters where determined by linear polarization measurements and potentiodynamic polarization method, and the surface of the metal samples were investigated using an optical microscope after the polarization measurements
This was the motivation for this work in which we investigated the possibility of corrosion inhibition of pure Cu, Al and stainless steel AISI 316L using green tea extract in NaCl solution
Summary
Metals, such as copper, aluminum, and its alloys along with stainless steels, are used in almost all spheres of human activity today. A large number of commercial corrosion inhibitors are synthetic chemicals which may be expesive and hazardous to living creatures and environments, so in recent years efforts have been made to replace it with natural non-toxic substances Many investigators turned their attention to plant extracts, which have become important for investigation as environmental acceptable, readily available and renewable source for wide range of potential corrosion inhibitors [5,6,7,8,9,10]. This was the motivation for this work in which we investigated the possibility of corrosion inhibition of pure Cu, Al and stainless steel AISI 316L using green tea extract in NaCl solution. Certain phenolic compounds have already shown themselves to be good corrosion inhibitors for various metals and alloys [15,16,17,18,19]
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