ORBi: Perez F. J. - Surface methods for cleaner steels : evaluation of inclusions and grain boundary segregations by electrochemical impedance spectroscopy

Reference : Surface methods for cleaner steels : evaluation of inclusions and grain boundary segrega...


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/2268/7862

Title :	Surface methods for cleaner steels : evaluation of inclusions and grain boundary segregations by electrochemical impedance spectroscopy
Language :	English
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 - ULg > Département d'aérospatiale et mécanique > Science des matériaux métalliques >]
	Greday, Y. [ > > ]
Publication date :	1999
Main document title :	Proceedings of The International COST-517 : Workshop on Cleaner Metals for Industrial Exploitation
Pages :	33-44
Peer reviewed :	No
Audience :	International
City :	Rez
Country :	Czech republic
Event place (city) :	Rez
Event country :	Czech republic
Keywords :	[en] Low alloy steel ; oxidation ; corrosion ; oxide layer ; ETS
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.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/7862

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