Mechanism of Cathodic Reactions in Acetic Acid Corrosion of Iron and Mild Steel

The mechanism of the cathodic reaction in acetic acid corrosion of iron and API X65 mild steel was investigated in mildly acidic sodium chloride electrolytes. The behavior of the charge transfer controlled currents in the steady state voltammograms showed that undissociated acetic acid is not signif...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2016-12, Vol.72 (12), p.1539-1539
Main Authors: Kahyarian, Aria, Brown, Bruce, Nešić, Srdjan
Format: Article
Language:English
Subjects:
Acetic acid
Acids
Carbon dioxide
Carbon steels
Charge transfer
Constraining
Corrosion
Corrosion mechanisms
Electrolytes
Equilibrium
High strength low alloy steels
Hydrogen
Hydrogen ion concentration
Hydrogen ions
Impurities
Iron
Low carbon steels
Mass transfer
Mathematical analysis
Pipelines
Sodium
Sodium chloride
Steel
Steels
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Summary:The mechanism of the cathodic reaction in acetic acid corrosion of iron and API X65 mild steel was investigated in mildly acidic sodium chloride electrolytes. The behavior of the charge transfer controlled currents in the steady state voltammograms showed that undissociated acetic acid is not significantly electroactive. This behavior was found to be in accordance with the so-called "buffering effect" mechanism, where acetic acid acts solely as an additional source of hydrogen ions. The increased limiting currents in the presence of acetic acid showed a linear correlation with undissociated acetic acid concentration in agreement with the Levich equation, suggesting that the limiting currents are under mass transfer control. Both pure iron and X65 steel exhibited a similar behavior regarding the cathodic currents, indicating that the mechanism of hydrogen ion reduction is not influenced by minor impurities present in the X65 steel.
ISSN:0010-9312
1938-159X
DOI:10.5006/2177