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51318-10905-Mechanistic Study of the Role of Pyrite in Localized Corrosion of Mild Steel

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.

Product Number: 51318-10905-SG
Author: Jing Ning, Yougui Zheng, Bruce Brown, David Young, and Srdjan Nesic
Publication Date: 2018
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In the previous study by the same authors, a localized corrosion mechanism related to the presence of pyrite corrosion product was proposed by observing and replicating severe localized corrosion in sour environments. In the present study, in order to further validate this localized corrosion mechanism, a comprehensive mechanistic study of localized corrosion was designed and conducted. The experimental design was based on two hypotheses addressing the cause of this type of localized corrosion: an electrochemical galvanic effect and a chemical effect. Thus, novel experiments involving deposition of pyrite particles onto the bare steel surface and onto steel covered by a thin electrically insulating mesh surface were conducted in an aqueous H2S solution. It was found that no localized corrosion was observed when the physical contact between pyrite particles and the steel underneath was eliminated by using an insulating mesh. Moreover, the experiments were also performed in aqueous CO2 solution for further validation. Based on the experimental observations, the electrochemical galvanic hypothesis was proven to be the key mechanism in this type of localized corrosion.

Keywords: Hydrogen sulfide, corrosion, localized corrosion, pyrite, galvanic effect

 

In the previous study by the same authors, a localized corrosion mechanism related to the presence of pyrite corrosion product was proposed by observing and replicating severe localized corrosion in sour environments. In the present study, in order to further validate this localized corrosion mechanism, a comprehensive mechanistic study of localized corrosion was designed and conducted. The experimental design was based on two hypotheses addressing the cause of this type of localized corrosion: an electrochemical galvanic effect and a chemical effect. Thus, novel experiments involving deposition of pyrite particles onto the bare steel surface and onto steel covered by a thin electrically insulating mesh surface were conducted in an aqueous H2S solution. It was found that no localized corrosion was observed when the physical contact between pyrite particles and the steel underneath was eliminated by using an insulating mesh. Moreover, the experiments were also performed in aqueous CO2 solution for further validation. Based on the experimental observations, the electrochemical galvanic hypothesis was proven to be the key mechanism in this type of localized corrosion.

Keywords: Hydrogen sulfide, corrosion, localized corrosion, pyrite, galvanic effect

 

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