Effect of Acetic Acid and Trace Amounts of H₂S on the Corrosion Behavior of Martensitic Stainless Steel in Natural Gas CO₂ Corrosion Environment

Toshiyuki Sunaba; Tadashi Shinohara; Yoshikazu Miyata; Shukuji Asakura; Takao YAKOU; Yasuyoshi Tomoe

doi:10.3323/jcorr.63.468

January 1, 2014Corrosion engineering digestOpen Access

Effect of Acetic Acid and Trace Amounts of H₂S on the Corrosion Behavior of Martensitic Stainless Steel in Natural Gas CO₂ Corrosion Environment

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Key Points

Evaluate the effects of acetic acid and trace hydrogen sulfide on the carbon dioxide corrosion behavior of standard 13%Cr and modified 13Cr martensitic stainless steels at 40°C and 180°C.
Tested 13%Cr and modified 13Cr martensitic stainless steel specimens under 2 MPa CO2 and 20,000 ppm Cl- at temperatures of 40°C and 180°C.
Assessed corrosion response under exposure to trace H2S (including 0.001 MPa partial pressure) with and without the addition of acetic acid.
For 13%Cr steel at 40°C, trace H2S suppressed pitting corrosion through iron sulfide formation, whereas at 180°C, acetic acid accelerated corrosion.
For modified 13Cr steel, 0.001 MPa H2S alone caused no corrosion at 40°C, but the addition of acetic acid initiated pitting corrosion at 40°C and accelerated corrosion rates at 180°C.
Acetic acid combined with trace H2S exacerbated degradation by lowering solution pH, increasing Fe2+ solubility, and deteriorating the passive film.

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Implication

Laboratory study demonstrates that acetic acid and trace hydrogen sulfide accelerate pitting and degradation in martensitic stainless steel, highlighting risks for natural gas wells.

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Sunaba et al. (2014) studied this question.

synapsesocial.com/papers/6a866209ab7057fd22832d60 https://doi.org/10.3323/jcorr.63.468

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Effect of Acetic Acid and Trace Amounts of H₂S on the Corrosion Behavior of Martensitic Stainless Steel in Natural Gas CO₂ Corrosion Environment

Key Points

No abstract yet

Implication

Discussion

Cite This Study

Effect of Acetic Acid and Trace Amounts of H₂S on the Corrosion Behavior of Martensitic Stainless Steel in Natural Gas CO₂ Corrosion Environment

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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