Abstract
Recently research is focused on natural organic compounds as metallic corrosion inhibitors demonstrating good corrosion protection and efficiencies. Steel corrosion behavior in acid media was evaluated in the presence of a pure natural flavonoid metabolite named Chrysin present in different plants. The evaluation of corrosion protection was studied using polarization curves, electrochemical impedance spectroscopy (EIS) and electrochemical current density under potentiostatic conditions. Polarization curves present active dissolution and at high overpotentials two passivation regions were found. Slight corrosion protection was obtained from EIS measurements and potentiostatic curves at three different anodic potentials: -370, +216 and +600 mV, revealed a more stable passive film in the presence of Chrysin at both passive regions. High corrosion protection was obtained on the film formed at +600 mV during the first 4 hours of immersion.
Highlights
Mild steel is the most common metal used by the oil, petrochemical and construction industries, due to its physical and mechanical properties such as malleability, ductility, hardness, and its low cost [1]
Mild steel in H2SO4 system presents few oscillations, around +510 mV, due to instability caused from the breakdown of the first passive film and formation of the second passive film [28]
The uniform corrosion of mild steel in acidic media proceeds when mild steel reacted with hydrogen ions, and oxide films are formed at more positive anodic over-potentials
Summary
Mild steel is the most common metal used by the oil, petrochemical and construction industries, due to its physical and mechanical properties such as malleability, ductility, hardness, and its low cost [1]. Corrosion is an electrochemical process that affects metallic materials, degrading its properties [2]. This deterioration mechanism can be controlled by some corrosion prevention measures like synthesized inhibitors [3]-[5]. Several researchers have determined that organic compounds with heteroatoms like nitrogen, oxygen, phosphorous, sulfur, or aromatic rings as functional group in their structure, are capable to reduce the corrosion rate [613]. In the development of novel corrosion inhibitors, it has been considered to design non-toxic compounds, some of them have been obtained from natural sources which have been a good alternative [4], [14]-[18]
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