Rotating cylinder experiments demonstrated that corrosion rates of steel exposed to oxygenated aqueous solutions containing hydrogen sulfide (H2S) and ammonia (NH3) were dependent upon pH, the presence of oxygen (O2), H2S concentration, and flow. Corrosion was more severe than expected based upon a review of published reports considering systems at relatively low ammonium hydrosulfide (NH4HS) concentrations and above pH 6. Dependence of carbon steel (CS) corrosion rates on pH and the impact of O2 was strong, but only prior to reaction between H2S and O2. The influence of H2S concentration was unexpected in that neutral, 1 mM solutions were more corrosive than neutral, 10 mM solutions in short-term tests and on a sustained basis.
Keywords:
ammonia,
carbon steel,
corrosion rate,
flow,
general corrosion,
hydrogen sulfide,
oxygen,
polysulfide,
pH,
rotating cylinder
NACE International
1996
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