An Electrochemical Study of the Corrosion Behaviour of T91 Steel in Molten Nitrates-Reference-Cited by-同舟云学术

An Electrochemical Study of the Corrosion Behaviour of T91 Steel in Molten Nitrates

Published:2023-03-01 Issue:3 Volume:13 Page:502
ISSN:2075-4701
Container-title:Metals
language:en
Short-container-title:Metals

Author:

Lopez-Dominguez D.¹,Gomez-Guzman N. B.¹,Porcayo-Calderón J.²^ORCID,Lopez-Sesenes R.³^ORCID,Larios-Galvez A. K.⁴,Sarmiento-Bustos E.⁵,Rodriguez-Clemente E.⁶^ORCID,Gonzalez-Rodriguez J. G.¹^ORCID

Affiliation:

1. Research Centre in Engineering and Applied Sciences, Morelos State Autonomous University, Cuernavaca 62209, Mexico

2. Chemical Engineering and Metallurgy Department, Sonora State University, Sonora 83000, Mexico

3. Chemical Science and Engineering Faculty, Morelos State Autonomous University, Cuernavaca 62209, Mexico

4. Physical Sciences Institute, National Autonomous University of Mexico, Cuernavaca 62209, Mexico

5. Industrial Mechanical Division, Morelos State Emiliano Zapata Technological University, Emiliano Zapata 62565, Mexico

6. Basic Sciences Department, Metropolitan Azcapotzalco Autonomous University, Mexico City 02080, Mexico

Abstract

A study of the corrosion behaviour of T91 steel in molten 60 wt% NaNO3-40%KNO3 has been carried out at 300, 400 and 500 °C during 1000 h. Employed techniques included potentiodynamic polarization tests, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) measurements. Experiments were complemented by detailed scanning electronic measurements and X-ray diffraction studies. Polarization curves revealed the existence of a passive layer formed onto the steel, composed mainly of Cr2O3, FeCr2O4, NaCrO4 and K2Fe2O4. Corrosion current density values increased, whereas the polarization resistance value decreased more than one order of magnitude as the testing temperature increased. EIS tests indicated a charge transfer controlled corrosion process, regardless of the testing temperature, and that the double electrochemical layer resistance decreased with the temperature.

Publisher

MDPI AG

Subject

General Materials Science,Metals and Alloys

Link

https://www.mdpi.com/2075-4701/13/3/502/pdf

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