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51317--9789-Electrochemical Studies of Open-Circuit Potential Drift of Carbon Steel in Nuclear Waste Simulants

Picture for Electrochemical Studies of Open-Circuit Potential Drift of Carbon Steel in Nuclear Waste Simulants
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Nuclear wastes are stored in large, underground carbon-steel storage tanks at the Hanford site. Carbon steels can become susceptible to localized corrosion. This paper presents the results of ongoing electrochemical investigations to understand the reasons behind the noble drift in the OCP of carbon steel in these waste simulants.

 

Product Number: 51317--9789-SG
ISBN: 9789 2017 CP
Author: Sandeep Chawla
Publication Date: 2017
Industry: Energy Generation
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Nuclear wastes are stored in large underground carbon-steel storage tanks at the Hanford site. Most of the liquid wastes are highly alkaline in nature typically with pH values between 12 and 14. Under alkaline conditions carbon steels tend to be passive and undergo relatively slow uniform corrosion. However carbon steels can become susceptible to localized corrosion (e.g. pitting) and stress corrosion cracking (SCC) in the presence of certain aggressive constituents such as chloride and nitrate even in these passive conditions. Susceptibility to pitting and SCC can also be enhanced under conditions of elevated open circuit potential (OCP). In this work long-term coupon immersion testing was conducted on carbon steel in a set of alkaline waste simulants. Large OCP drifts ranging from about +250 mV to +350 mV were observed in several simulants. This paper will present the results of ongoing electrochemical investigations to understand the reasons behind the anodic drift in the OCP of carbon steel in these waste simulants.

Key words: Open-circuit potential, passive film, Mott-Schottky, tank steel, Hanford, radioactive waste

Nuclear wastes are stored in large underground carbon-steel storage tanks at the Hanford site. Most of the liquid wastes are highly alkaline in nature typically with pH values between 12 and 14. Under alkaline conditions carbon steels tend to be passive and undergo relatively slow uniform corrosion. However carbon steels can become susceptible to localized corrosion (e.g. pitting) and stress corrosion cracking (SCC) in the presence of certain aggressive constituents such as chloride and nitrate even in these passive conditions. Susceptibility to pitting and SCC can also be enhanced under conditions of elevated open circuit potential (OCP). In this work long-term coupon immersion testing was conducted on carbon steel in a set of alkaline waste simulants. Large OCP drifts ranging from about +250 mV to +350 mV were observed in several simulants. This paper will present the results of ongoing electrochemical investigations to understand the reasons behind the anodic drift in the OCP of carbon steel in these waste simulants.

Key words: Open-circuit potential, passive film, Mott-Schottky, tank steel, Hanford, radioactive waste

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