Abstract
Crude petroleum contains sulfur compounds, most of which are removed during refining. The corrosivity of sulfur 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. Here the corrosivity of copper strips are tested with elemental sulfur and different mercaptans in synthetic naphtha. The great corrosive power of elemental sulfur is 3.7 times higher than that of ethylmercaptan, the most corrosive among the different mercaptans. The elemental sulfur and ethyl-mercaptan corrosion distribution on copper strips is also studied by means of the ASTM D-130 test together with electronic microscopy (SEM) and energy dispersive X-ray (EDX) techniques. These non-destructive techniques allow to know the strip corrosive morphology and to determine the sulfur concentration on the strip.
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