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Study of corrosion on copper strips by mixtures of mercaptans, sulphides and disulphides with elemental sulphur in the ASTM D-130 test by means of electron microscopy (SEM) and energy dispersive X-ray (EDX)

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  • Inorganic Materials
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Summary

The corrosivity of sulphur compounds present in petroleum products is measured by means of the ASTM D-130 copper strip test, which is based on discoloration of a standard copper strip immersed into the petroleum products at 50°C for 3 h. This paper studies the influence that mercaptans, sulphides or disulphides exert on corrosion produced by elemental sulphur in synthetic naphtha in the ASTM D-130 test by means of scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) techniques. The synergistic effect of mercaptans on corrosion produced by elemental sulphur is an inverse function of the number of carbon atoms in linear mercaptans. For mercaptans with 6 carbon atoms corrosion activity follows the order: hexylmercaptan > cyclohexylmercaptan > thiophenol. In general, sulphides and disulphides decrease the corrosion produced by elemental sulphur. Among all the chemicals tested diphenyl disulphide is the best inhibitor of corrosion produced by elemental sulphur.

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Authors and Affiliations

  1. Departamento Ingeniería Química y Nuclear, E.T.S.I. Industriales, Universidad Politécnica de Valencia, P.O. Box 22012, E-46071, Valencia, Spain

    J. García-Antón & J. L. Guiñón

  2. Departamento Ingeniería de la Construcción, U. D. Química, E.T.S.I.C.C. y P., Universidad Politécnica de Valencia, P.O. Box 22012, E-46071, Valencia, Spain

    J. Monzó

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  1. J. Monzó
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  2. J. García-Antón
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  3. J. L. Guiñón
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Monzó, J., García-Antón, J. & Guiñón, J.L. Study of corrosion on copper strips by mixtures of mercaptans, sulphides and disulphides with elemental sulphur in the ASTM D-130 test by means of electron microscopy (SEM) and energy dispersive X-ray (EDX). Fresenius J Anal Chem 343, 593–596 (1992). https://doi.org/10.1007/BF00324820

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  • DOI: https://doi.org/10.1007/BF00324820

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