Latest developments in iron sulfide dissolver studies. Lab tests performed to evaluate some new products for thermal stability, corrosivity, compatibility with formation water, and dissolving authigenic mineral and field deposits.
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Based on two hypotheses of the cause of this type of localized corrosion: an electrochemical galvanic effect and a chemical effect. Observations indicate that the electrochemical galvanic hypothesis was the key mechanism in this type of localized corrosion.
The formation of greigite and/or pyrite seems to correlate with onset of localized corrosion Experiments involving deposition of pyrite on the steel surface were conducted to investigate if localized corrosion occurs when pyrite is deposited on mild steel in an aqueous H2S environment.