iman Amini
Keywords: Pitting corrosion, stainless steel, CPT, sulfure species
Abstract:
In this case study, we want to
investigate the factors that cause pitting corrosion on stainless steel 304l.
In a gas refinery a heat
exchanger 304l stainless steel tubes, and after a few months, its tubes have
undergone pitting corrosion.To analyze the
corrosion products and possible compounds affecting the Pitting corrosion, XRD,
and XRF tests were performed. Also, SEM and EDX test was done from the inner
surface of the tube. The inlet feed was wet sour gas that contained H<sub>2</sub>S. The infiltrating oxygen reacts with the system with hydrogen sulfide and produces dust and sulfur compounds,
including S<sub>2</sub>O<sub>3</sub><sup>2-</sup>, which increases the rate of
anodic reactions in the Pit. Thiosulfate also reacts in the acidic environment
of the pit, causing the presence of elemental sulfur on the surface of the pit
and preventing the reformation of the passive layer. Our aim in this paper is to investigate the
effect of oxygen penetration into environments containing H<sub>2</sub>S and
the production of sulfur and sulfur compounds on pitting corrosion of stainless
steel 304l
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