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Surface methods for cleaner steels : evaluation of inclusions and grain boundary segregations by electrochemical impedance spectroscopy
Perez, F. J.; Duday, D.; Hierro, M. P. et al.
1999In Proceedings of The International COST-517 : Workshop on Cleaner Metals for Industrial Exploitation
 

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Keywords :
Low alloy steel; oxidation; corrosion; oxide layer; ETS; LiMaRC - Liège Materials Research Center
Abstract :
[en] The structure, defects concentration and the Corrosion resistance of oxide scales formed at 650°C on hot rolling roils composed of HSS steels without or with a 4% Co addition were examined by electrochemical impedance spectroscopy. Scales were obtained aller I , 3 and 6 days of oxidation in air. For ail the steels, Fe203 and Cr203 were mainly formed at the surface. The difference of corrosion behavior is due to the thickness, the microstructure ami the porosity of the scale, which are influenced by the time of oxidation and the Co addition. Corrosion examinations were carried out in a O.5M NaCI solution at ambient temperature. The Co addition has a effect on increasing the corrosion resistance for the non-oxidized and oxidized samples but this effect is limited in tinie. The corrosion increased with die lime of immersion except for the HSS without Co oxidized 3 days. After 6 days of oxidation, the resistarice to COITOSIOfl iS two orders of magnitude higher that means a critical scale thickness was reached.
Disciplines :
Materials science & engineering
Author, co-author :
Perez, F. J.;  Universidad Complutense de Madrid. Facultad de Ciencias Quimicas, Departamento de Ciencia de Los Materiales. 28040 Madrid. SPA1N
Duday, D.;  Universidad Complutense de Madrid. Facultad de Ciencias Quimicas, Departamento de Ciencia de Los Materiales. 28040 Madrid. SPA1N
Hierro, M. P.;  Universidad Complutense de Madrid. Facultad de Ciencias Quimicas, Departamento de Ciencia de Los Materiales. 28040 Madrid. SPA1N
Gomez, C.;  Universidad Complutense de Madrid. Facultad de Ciencias Quimicas, Departamento de Ciencia de Los Materiales. 28040 Madrid. SPA1N
Lecomte-Beckers, Jacqueline ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Greday, Y.
Language :
English
Title :
Surface methods for cleaner steels : evaluation of inclusions and grain boundary segregations by electrochemical impedance spectroscopy
Publication date :
1999
Event place :
Rez, Czechia
Audience :
International
Main work title :
Proceedings of The International COST-517 : Workshop on Cleaner Metals for Industrial Exploitation
Pages :
33-44
Available on ORBi :
since 05 December 2009

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