51312-01064-Corrosion of mild Steel and inhibition of Two Field-used Inhibitors in the Presence of Elemental Sul

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Product Number: 51312-01064-SG

ISBN: 01064 2012 CP

Author: Xiu Jiang

Publication Date: 2012

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Elemental sulfur deposition is a major concern in sour gas production fields. The direct contact of wet elemental sulfur with mild steel can cause catastrophic corrosion problems. The objective of this project is to study the corrosivity of elemental sulfur and the mitigation of two field used inhibitors to elemental sulfur corrosion . Elemental sulfur corrosion of mild steel in 3.5% and 10% NaCl solution was investigated using surface characterization and weight loss method. The result indicated that in both studied conditions the general corrosion rate was increased almost 40 times by elemental sulfur and severe pitting corrosion attack was observed even by naked eyes. The pitting corrosion became more serious with the increasing of the salt concentration. Performances of a batch inhibitor A and a field continuously injected inhibitor B were evaluated in 3.5% NaCl with and without elemental sulfur through Linear Polarization Resistance (LPR) technique Weight Loss(WL) measurement and surface analysis. The batch inhibitor A became failured with serious pitting attack in 2 days if elemental sulfur is present whereas it had good persistency in 35 days under elemental sulfur free condition. The inhibition of inhibitor B increased with the increasing of concentration then almost kept constant at higher than 1000ppm in the absence of elemental sulfur. The general corrosion rate was acceptable and pitting corrosion attack in 6 days was rarely observed with addition of both inhibitor A and 1000ppm of inhibitor B in the presence of elemental sulfur.