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51318-11438-Electrochemical Methods for Assessing the Pitting Corrosion Resistance of Metallic Materials

Picture for Electrochemical Methods for Assessing the Pitting Corrosion Resistance of Metallic Materials
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Assessing pitting corrosion resistance of metallic materials in chloride-containing environments at elevated temperature…based on electrochemical results obtained on two materials in oilfield upstream applications.

Product Number: 51318-11438-SG
Author: Helmuth Sarmiento Klapper / Sebastian Jesse / Andreas Heyn
Publication Date: 2018
Industry: Oil and Gas Production
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Industrial applications involve a very diverse range of environments, for instance, high chloride-bearing streams at elevated temperatures that challenge the pitting corrosion resistance of passive materials. Pitting corrosion resistance is not only a reject criterion for materials selection during the design stages of engineering components; later on, it constitutes a significant limiting factor to the service life of those components when exposed to corrosive environments. Therefore, the characterization of the pitting corrosion resistance of metallic materials was, is, and will remain a topical issue. Besides the use of empirical correlations such as the pitting corrosion equivalent as well as the determination of the critical pitting temperature to infer resilience during service, electrochemical methods including potentiodynamic polarization tests and electrochemical noise have been experimentally used for determining the pitting resistance of metallic materials in simulated operational conditions. The assets and drawbacks of these different methodologies for assessing pitting corrosion resistance of metallic materials in chloride-containing environments at elevated temperature are discussed in this paper based on electrochemical results obtained on two materials commonly used in oilfield upstream applications.

Key words: Pitting corrosion, Cyclic potentiodynamic polarization, Electrochemical noise, Stainless steel, Nickel alloy

Industrial applications involve a very diverse range of environments, for instance, high chloride-bearing streams at elevated temperatures that challenge the pitting corrosion resistance of passive materials. Pitting corrosion resistance is not only a reject criterion for materials selection during the design stages of engineering components; later on, it constitutes a significant limiting factor to the service life of those components when exposed to corrosive environments. Therefore, the characterization of the pitting corrosion resistance of metallic materials was, is, and will remain a topical issue. Besides the use of empirical correlations such as the pitting corrosion equivalent as well as the determination of the critical pitting temperature to infer resilience during service, electrochemical methods including potentiodynamic polarization tests and electrochemical noise have been experimentally used for determining the pitting resistance of metallic materials in simulated operational conditions. The assets and drawbacks of these different methodologies for assessing pitting corrosion resistance of metallic materials in chloride-containing environments at elevated temperature are discussed in this paper based on electrochemical results obtained on two materials commonly used in oilfield upstream applications.

Key words: Pitting corrosion, Cyclic potentiodynamic polarization, Electrochemical noise, Stainless steel, Nickel alloy

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