Abstract
In this research, 3-Mercaptopropionic acid (MPA) as corrosion inhibitor of carbon steel in CO2 aerated 1% NaCl solution with buffer pH adjustment has been studied by means of electrochemical impedance (EIS) and polarization (Tafel plot). MPA was found to be an effective carbon steel inhibitor. Percentage inhibition efficiency (IE %) calculated by both Tafel plot and EIS, ranged from 85% to 90%. MPA was found to affect the cathodic processes and act as cathodic-type inhibitors. Mechanism of inhibit corrosion by adsorption mechanism leads to the formation of a protective chemisorbed film on the metal surface film which suppresses the dissolution reaction and the hydrogen evolution reaction is activation controlled.
Highlights
Corrosion is the destructive result of chemical reaction between a metal or metal alloy and its environment
In this paper Mercaptopropionic acid (MPA) was tested as carbon steel corrosion inhibitor in CO2-saturated aqueous NaCl solutions and pH of solution was adjusted by buffer, due to the corrosion inhibition efficiency showed by the mercapto functional group
Current potential characteristics resulting from potentiodynamic curves for the carbon steel electrode in 1% NaCl solution were evaluated by Tafel plot method
Summary
Corrosion is the destructive result of chemical reaction between a metal or metal alloy and its environment. Corrosion on the exterior of pipes can be controlled by coating or cathodic protection, but not in the interior It can only inhibited by the adding of inhibitor. Corrosion inhibitors used for the protection of steel in oil wells are mostly organic bases containing nitrogen, sulfur and oxygen atoms in their structure. Been addressed toward the goal of using cheap, effective molecules at low or ‘‘zero’’ environmental impact These compounds include certain amino acids and derivatives, which have been tested for various metals, such as carbon steel or copper corrosion in H2SO4 or HCl (Moretti, Guidi, and Grion 2004). In this paper MPA was tested as carbon steel corrosion inhibitor in CO2-saturated aqueous NaCl solutions and pH of solution was adjusted by buffer, due to the corrosion inhibition efficiency showed by the mercapto functional group
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