Abstract
The effect of concentration and immersion time of phenylalanine (Phe), leucine (Leu) and valine (Val) for AISI 1018 in sweet brine was studied trough Electrochemical Impedance Spectroscopy (EIS), polarization resistance (Rp), Scanning Electronic Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) as an ecological and biodegradable alternative as corrosion inhibitors. Electrochemical results showed that amino acids are good corrosion inhibitors according to their charge transfer resistance improvement. The effect of immersion time on corrosion behavior was studied trough 24 h with amino acids concentration variation of 0, 10, 100 and 250 ppm. The preliminary results demonstrated that the three amino acids adsorb over metal surface following the Langmuir adsorption isotherm model, and tend to agglomerate in bulk within time. Keywords: Corrosion Inhibitors; Biodegradable; Amino acids; Sweet brine
Highlights
In spite of all developments in new technologies; the search of new oil sources is utmost importance due to the energy growing demand [1]
In this way the presence of functional groups; heteroatoms and multiple bonds make organic compounds a good option as corrosion inhibitors[4], due to this; amino acids have been used as corrosion inhibitors for several metals and alloys in different electrolytes for multiple applications.; their efficiency depends on many factors; such as inhibitor and oxygen concentration; metal and compound chemical nature; surface preparation of metal; immersion time; hydrodynamic conditions; temperature; pH and additives [5]
Nyquist plots of AISI 1018 in the sweet brine in absence and presence of Phe during 24 h of immersion can be appreciated in figure2; which seem to appear as depressed semicircles caused by the heterogeneity of the metal surface [17]
Summary
In spite of all developments in new technologies; the search of new oil sources is utmost importance due to the energy growing demand [1]. It comes with new challenges to inhibit corrosion in extraction and transportation systems [2] without neglecting the ecological issue Some researchers such as A.A [3] mentioned that the use of synthetic organic inhibitors in oil and gas industry leads to stricter environmental regulations to their usage; making necessitated the research of new natural; inexpensive and environmentally friendly corrosion inhibitors. In this way the presence of functional groups; heteroatoms and multiple bonds make organic compounds a good option as corrosion inhibitors[4], due to this; amino acids have been used as corrosion inhibitors for several metals and alloys in different electrolytes for multiple applications.; their efficiency depends on many factors; such as inhibitor and oxygen concentration; metal and compound chemical nature; surface preparation of metal; immersion time; hydrodynamic conditions; temperature; pH and additives [5]. It was determinate that the concentration is a decisive factor for a corrosion inhibitor; many authors have used amino acids in a wide range of concentrations in order to achieve high corrosion inhibition efficiencies; from tens of ppm
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