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Repeated cyclic potentiodynamic polarization (CPP) measurements were performed in different environments for both carbon steel and Type 304L stainless steel. The effect of different environmental species, nitrite and hydroxide on repassivation/reactivation mechanism of carbon steel is examined.
Carbon steel exhibits passivity in highly alkaline and nitrite-containing solutions warranting its use in storing high pH radioactive waste. The boundaries of corrosion resistance of carbon steel in radioactive waste solutions stored in underground tanks are derived from the repassivation potential for localized corrosion of steel in various solutions. If the corrosion potential is higher than the repassivation potential, stable localized corrosion is likely to occur. The repassivation process can be considered in terms of a competition between stable oxide-type passive film formation versus an active metal salt-enriched layer formation, depending on the potential. This approach has worked reasonably well for stainless steels and Ni-base alloys. It is often argued that carbon steel is not a strongly passivating metal unlike stainless steels and, therefore, the stability of the oxide film on carbon steel is questionable. An alternative hypothesis is that repassivation potential is related to the corrosion potential of the bottom of the localized corrosion region. This paper evaluates this argument by conducting repeated cyclic potentiodynamic polarization (CPP) measurements in different environments for both carbon steel and Type 304L stainless steel. The effect of different environmental species, nitrite and hydroxide on repassivation/reactivation mechanism of carbon steel is examined.
Key words: downloadable, pit repassivation, pit reactivation, carbon steel, nuclear waste, repeated cyclic potentiodynamic polarization
A brief overview of ASTM G48 – "Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution" is used for corrosion testing in the metals industry.
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Carbon Capture and Storage (CCS). The CO2 stream, captured from power plants contains highly corrosive impurities including H2O vapor, oxygen, and hydrogen sulfide. This paper presents our study on corrosion of pipeline steel in sc-CO2 containing H2O, H2S and/or O2 impurities in an autoclave.
In the present work a brief description of the mechanism development and examples of the pitting and crevice systems that have confirmed the validity of this localized acidification mechanism for stable pitting growth. Potential future lines of work are also briefly suggested.