Keywords
High temperature
corrosion
stainless steel
ferritic steel
peroxidation
electrochemical
gravimetric techniques
sodium sulfate corrosión
altas temperaturas
acero inoxidable
acero ferrítico
preoxidación
electroquímicas
técnicas gravimétricas
sulfato de sodio
corrosion
stainless steel
ferritic steel
peroxidation
electrochemical
gravimetric techniques
sodium sulfate corrosión
altas temperaturas
acero inoxidable
acero ferrítico
preoxidación
electroquímicas
técnicas gravimétricas
sulfato de sodio
How to Cite
Peña Ballesteros, D. Y., Estupiñán Durán, H., Vásquez Quintero, C., Cáceres, E., & Ortíz, A. (2013). High-Temperature Corrosion of Modified 9Cr-1Mo Alloys, 2.25Cr-1Mo and Pre- oxidized 304H, in Na2SO4, by Using Electrochemical and Gravimetric Techniques. Informador Tecnico, 77(2). https://doi.org/10.23850/22565035.56
Abstract
The corrosion behavior of three types of steels, pre-oxidized and without pre-oxidation, coated with sodium sulfate was evaluated in the present work by using electrochemical techniques, including polarization resistance, Tafel curves, electrochemical impedance, and gravimetric techniques like weight gain, at 600 and 650 °C. It was determined that the steel exhibiting the lowest corrosion rate was 304H, being the most resistant coated specimen with solid Na2SO4 in air atmosphere because its oxide layer formed initially was maintained even at high temperatures. For ferritic steels, a slight increase in corrosion rate was noted, presenting a small diffusion of sulfur and sulfide formation at the alloy/oxide interface, given that it fractured due to the difference in the thermal expansion coefficients. In general, a solid Na2SO4 deposit over the steels used in systems working at high temperatures is not a risk factor that influences material degradation.References
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