Community Research and Development Information Service - CORDIS


Final report on Contract No 7210-PR/101, 1 July 1998 to 30 June2001.

Industrial cold rolled stainless steels were investigated in terms of surface chemistry, cleanability, metal release, and corrosion resistance. As far as the surface properties are concerned, the passive film structure is different on new and aged surfaces. The experimental results strengthen the innocuousness of industrial stainless steels for food industry applications. There, the cleaning process based on soda, nitric acid and alkaline detersives does not introduce important changes on the pitting corrosion resistance. The steel surface reactivity in foodstuffs and cleaning products is directly controlled by the bulk metal composition and the passive film structure. The cleanability mechanism can be considered as a surface peeling on stainless steels. The external layer of the passive film, which is mainly composed of iron oxyhydroxides, is gradually dissolved by the alkaline detersive. This helps the soiling removal. Moreover, electropolishing does not enhance the cleanability of flat sheets. Finally, a low surface free energy material (hydrophobic) is not favourable for cleaning as the detergency principle is no longer respected.

Additional information

Authors: BOULANGÉ-PETERMANN L, Usinor, Isbergues (FR);GUIO M J, Acerinox SA, Los Barrios (ES);BENEZECH T, INRA, Villeneuve d'Ascq (FR);FAILLE Ch, INRA, Villeneuve d'Ascq (FR);JULLIEN C, INRA, Villeneuve d'Ascq (FR);BELLON-FONTAINE M N, INRA, Villeneuve d'Ascq (FR);DE CHRISTOFARO N, CSM, Rome (IT)
Bibliographic Reference: EUR 20476 EN (2002), pp.135. Euro: 20.50
Availability: EUR-OP reference: KI-NA-20476-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-4297-2
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