Abstract
N,N-Diethylammonium O,O′-di(p-methoxyphenyl)dithiophosphate (EAPP) as a new corrosion inhibitor was synthesized in the present work. The corrosion inhibition of EAPP in hydrochloric acid for carbon steel was evaluated by potentiodynamic polarization measurements, electrochemical impedance spectroscopy, weight loss measurements, and scanning electron microscopy. The results indicate that the EAPP is mixed type inhibitor, and the adsorption of EAPP on carbon steel surface obeys Langmuir isotherm. In addition, the inhibition efficiency increases with increasing the concentration of inhibitor and decreases with increasing the hydrochloric acid concentration, temperature, and storage time.
Highlights
Acid solutions are often used in industry for cleaning, chemical decaling, and pickling of metals [1, 2]
Most of the effective corrosion inhibitors are organic compounds containing electronegative atoms, the unsaturated bonds, and the plane conjugated systems including all kinds of aromatic cycles [7,8,9]
The steadystate was achieved after 30 min for electrochemical tests
Summary
Acid solutions are often used in industry for cleaning, chemical decaling, and pickling of metals [1, 2]. During those processes, as the existence of undesirable and extensive attack for metals as an important metal in different acid solutions, the application of corrosion inhibitors for preventing corrosion phenomena seems to be more and more important [3, 4]. Using inhibitor is one of the most practical methods for protection against corrosion especially in acid solution to prevent metals dissolution [5, 6]. The O,O-diaryldithiophosphates contain nitrogen, phosphorus, sulfur, and oxygen atoms in their structure, which could be potential inhibitors
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