Abstract
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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