Estudio de la resistencia a la corrosión localizada del acero inoxidable superaustenítico 24,1Cr22Ni7,1Mo en mezclas que contienen iones cloruro y cloruro-fluoruro

Angel Pardo Gutiérrez del Cid; Enrique Otero Huerta; María Concepción Merino Casals; María Dolores López González; María Victoria Utrilla Esteban

doi:10.3989/revmetalm.2001.v37.i4.515

Study of the localised corrosion resistance of the 24.1Cr22Ni7.1Mo superaustenitic stainless steel in mixtures containing chloride and chloride-fluoride ions

Authors

Angel Pardo Gutiérrez del Cid Departamento de Ciencia de Materiales, Facultad de Química, Universidad Complutense
Enrique Otero Huerta Escuela Experimental de Ciencia y Tecnología, Universidad Rey Juan Carlos
María Concepción Merino Casals Departamento de Ciencia de Materiales, Facultad de Química, Universidad Complutense
María Dolores López González Escuela Experimental de Ciencia y Tecnología, Universidad Rey Juan Carlos
María Victoria Utrilla Esteban Escuela Experimental de Ciencia y Tecnología, Universidad Rey Juan Carlos

DOI:

https://doi.org/10.3989/revmetalm.2001.v37.i4.515

Keywords:

24.1Cr22Ni7.1Mo superaustenitic stainless steel, Pitting corrosion, Crevice corrosion, Localised corrosion, Chloride, Fluoride, Repassivation, Pitting potential, Crevice potential, Passive layers.

Abstract

The localised corrosion resistance (pitting and crevice corrosion) of the high alloy 24.1Cr22Ni7.1Mo superaustenitic stainless steel has been studied in solutions with chloride concentrations between 200 and 6.000 ppm. A similar study has been carried out using mixtures of equal concentrations of chloride and fluoride ions in the range of 400 to 12.000 ppm. pH values varied from 2 to 6.5. The critical temperatures for pitting and crevice corrosion have been calculated for these test media using electrochemical techniques (direct current). From the results obtained by cyclic polarisation, the critical pitting temperature (CPT) and the critical crevice temperature (CCT) have been determined for this material in each of tested media. The resistance of this material to localised corrosion is high, mainly due to the high repassivation rate in the tested media. At the highest tested concentration of chloride and fluoride ions and at pH 6.5, the material undergoes a generalised attack.

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Published

2001-08-30

How to Cite

Pardo Gutiérrez del Cid, A., Otero Huerta, E., Merino Casals, M. C., López González, M. D., & Utrilla Esteban, M. V. (2001). Study of the localised corrosion resistance of the 24.1Cr22Ni7.1Mo superaustenitic stainless steel in mixtures containing chloride and chloride-fluoride ions. Revista De Metalurgia, 37(4), 499–508. https://doi.org/10.3989/revmetalm.2001.v37.i4.515

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Issue

Vol. 37 No. 4 (2001)

Section

Articles

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