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Experimental and Theoretical Study on the Synergistic Inhibition Effect of Pyridine Derivatives and Sulfur-Containing Compounds on the Corrosion of Carbon Steel in CO2-Saturated 3.5 wt.% NaCl Solution

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School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
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CNPC Engineering Technology Research Company Limited., No. 40 Jintang Road, Tanggu Binhai New Area, Tianjin 300451, China
3
School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
4
Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Molecules 2018, 23(12), 3270; https://doi.org/10.3390/molecules23123270
Received: 3 November 2018 / Revised: 28 November 2018 / Accepted: 5 December 2018 / Published: 11 December 2018
The corrosion inhibition performance of pyridine derivatives (4-methylpyridine and its quaternary ammonium salts) and sulfur-containing compounds (thiourea and mercaptoethanol) with different molar ratios on carbon steel in CO2-saturated 3.5 wt.% NaCl solution was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electron microscopy. The synergistic corrosion inhibition mechanism of mixed inhibitors was elucidated by the theoretical calculation and simulation. The molecules of pyridine derivative compounds with a larger volume has priority to adsorb on the metal surface, while the molecules of sulfur-containing compounds with a smaller volume fill in vacancies. A dense adsorption film would be formed when 4-PQ and sulfur-containing compounds are added at a proper mole ratio. View Full-Text
Keywords: corrosion inhibitor; synergistic effect; electrochemical measurements; theoretical calculation corrosion inhibitor; synergistic effect; electrochemical measurements; theoretical calculation
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Tang, J.; Hu, Y.; Han, Z.; Wang, H.; Zhu, Y.; Wang, Y.; Nie, Z.; Wang, Y. Experimental and Theoretical Study on the Synergistic Inhibition Effect of Pyridine Derivatives and Sulfur-Containing Compounds on the Corrosion of Carbon Steel in CO2-Saturated 3.5 wt.% NaCl Solution. Molecules 2018, 23, 3270.

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