RELATIONSHIP BETWEEN CHEMICAL MOLECULAR STRUCTURE AND ANTI-SULFUR PROPERTIES AND INHIBITION MECHANISM OF CORROSION INHIBITORS

J Chin Soc Corr Pro

2012, Vol. 32

Issue (2): 151-156 DOI:

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RELATIONSHIP BETWEEN CHEMICAL MOLECULAR STRUCTURE AND ANTI-SULFUR PROPERTIES AND INHIBITION MECHANISM OF CORROSION INHIBITORS

LIU Yuexue, LIU Liewei, DONG Meng, ZHANG Datong

Hubei Key Laboratory for Materials Chemistry & Service Failure, Huazhong University of Science and Technology, Wuhan 430074

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Abstract The inhibitive properties of five kinds of corrosion inhibitors, which contain imidazoline derivative, mannich base, pyridine quaternary ammonium salt, quinoline quaternary ammonium salt and a new fused heterocycle quaternary ammonium salt were studied by means of mass loss of saturated H₂S/CO₂ and dynamic rotating with high-pressure of H₂S/CO₂, atomic force microscopy(AFM), environmental scanning electron microscope(SEM) and energy dispersive X-ray(EDX) analysis on N80 steel. The results showed that inhibitive properties of five kinds of inhibitors enhanced with the increase of their concentration. The excellent order of the inhibitors was as followed: the new fused heterocycle quaternary ammonium salt > quinoline quaternary ammonium salt > pyridine quaternary ammonium salt>imidazoline derivative>mannich base. Corrosion inhibitor which had stronger electrostatic adsorption, smaller steric hindrance effect and larger electron density of the adatom had the better anti-sulfur properties. The inhibition mechanism of corrosion inhibitor was to inhibit the corrosion of CO₂/Cl^- and spur the formation of the compact sulfide film.

Key words: corrosion inhibitor hydrogen sulfide molecular structure AFM SEM EDX

Received: 22 November 2010

ZTFLH:

TG174.42

Corresponding Authors: LIU Yuexue E-mail: liuliewei@126.com

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LIU Yuexue, LIU Liewei, DONG Meng, ZHANG Datong. RELATIONSHIP BETWEEN CHEMICAL MOLECULAR STRUCTURE AND ANTI-SULFUR PROPERTIES AND INHIBITION MECHANISM OF CORROSION INHIBITORS. J Chin Soc Corr Pro, 2012, 32(2): 151-156.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I2/151

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