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The Role of Pyrite in Localized Corrosion of Mild Steel

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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.

Product Number: 51317--9251-SG
ISBN: 9251 2017 CP
Author: Jing Ning
Publication Date: 2017
Industry: Science of Corrosion
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Localized corrosion in sour fields is a challenge persisting in the oil and gas industry since it has frequently been seen as a cause for catastrophic failures of upstream pipelines. However compared to H2S general corrosion there is minimal understanding of H2S localized corrosion. Mechanisms of H2S localized corrosion are unclear and the causes of H2S localized corrosion are uncertain. Therefore seeking an experimental condition in the laboratory that can replicate localized corrosion in a sour environment is critical to understand mechanisms of localized corrosion. In the previous study a strong correlation between the formation of greigite and/or pyrite and onset of localized corrosion was observed. Consequently the formation of greigite and/or pyrite was hypothesized to play an important role in the initiation of localized corrosion. Novel experiments involving deposition of pyrite on the steel surface were then designed and conducted in the current study. Severe localized corrosion was observed and replicated in the presence of pyrite deposit layers. It was found that the galvanic coupling between pyrite particles and steel is the dominant mechanism for this type of localized corrosion. In addition based on the experimental observations a descriptive model was built to answer when where and how this type of localized corrosion occurs in a sour environment. This model can provide guidance for the mitigation of localized corrosion in field conditions.Keywords: Hydrogen sulfide localized corrosion pyrite iron sulfide polymorphism.

Keywords: Hydrogen sulfide, localized corrosion, pyrite, polymorphism

Localized corrosion in sour fields is a challenge persisting in the oil and gas industry since it has frequently been seen as a cause for catastrophic failures of upstream pipelines. However compared to H2S general corrosion there is minimal understanding of H2S localized corrosion. Mechanisms of H2S localized corrosion are unclear and the causes of H2S localized corrosion are uncertain. Therefore seeking an experimental condition in the laboratory that can replicate localized corrosion in a sour environment is critical to understand mechanisms of localized corrosion. In the previous study a strong correlation between the formation of greigite and/or pyrite and onset of localized corrosion was observed. Consequently the formation of greigite and/or pyrite was hypothesized to play an important role in the initiation of localized corrosion. Novel experiments involving deposition of pyrite on the steel surface were then designed and conducted in the current study. Severe localized corrosion was observed and replicated in the presence of pyrite deposit layers. It was found that the galvanic coupling between pyrite particles and steel is the dominant mechanism for this type of localized corrosion. In addition based on the experimental observations a descriptive model was built to answer when where and how this type of localized corrosion occurs in a sour environment. This model can provide guidance for the mitigation of localized corrosion in field conditions.Keywords: Hydrogen sulfide localized corrosion pyrite iron sulfide polymorphism.

Keywords: Hydrogen sulfide, localized corrosion, pyrite, polymorphism

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

Product Number: 51318-10905-SG
Author: Jing Ning, Yougui Zheng, Bruce Brown, David Young, and Srdjan Nesic
Publication Date: 2018
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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.
Picture for Localized Corrosion of Mild Steel under Iron Sulfide Layers in CO2/H2S Environment
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51318-10990-Localized Corrosion of Mild Steel under Iron Sulfide Layers in CO2/H2S Environment

Product Number: 51318-10990-SG
Author: Saba Navabzadeh Esmaeely / Gheorghe Bota / Bruce Brown / Srdjan Nesic
Publication Date: 2018
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Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high temperature sulfidation in oil, then exposed to a range of aqueous CO2 and H2S corrosion environments, leading to initiation of localized corrosion.

 
Picture for INFLUENTIAL FACTORS RELATED TO LOCALIZED CORROSION OF MILD STEEL IN SLIGHTLY SOUR ENVIRONMENTS
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51318-10984-INFLUENTIAL FACTORS RELATED TO LOCALIZED CORROSION OF MILD STEEL IN SLIGHTLY SOUR ENVIRONMENTS

Product Number: 51318-10984-SG
Author: Wei Zhang / Bruce Brown / David Young / Srdjan Nesic / Marc Singer
Publication Date: 2018
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A comprehensive parametric study was performed using a small-scale laboratory setup with the aim of investigating the occurrence of localized corrosion of mild steel in marginally sour environments.
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