The aim of this work is to study the electrochemical marking process that allows to obtain technical and decorative graphical effects on stainless steel by the controlled growth of protective oxides and to develop new electrolytes able to increase even more the technical and aesthetic result on different stainless steels series. The advantages of the electrochemical marking are: i) the possibility to obtain decorations with greater mechanical and chemical resistance compared to those obtained by screen printing and laser processes; ii) high process speed (few seconds); iii) the absence of heat input to the treated surface, unwelcome phenomenon that, in the case of laser marking, may lead to the deformation of the artifacts in particular on low sheet thicknesses or when realizing big logos; iv) high graphical definition; v) ecology: no solvents, acids or dangerous compounds needed; vi) low power consumption: possibility to use portable battery powered units. In particular, the aim of this work is to characterize the oxides obtained by electrochemical decoration on EN 1.4301/AISI 304 austenitic stainless steel in terms of corrosion resistance (by polarization curves), chemical composition (by Raman spectroscopy) and color (CIE Lab visible spectroscopy). The results obtained from the characterization were then used to formulate new compositions of the electrolyte that allow to improve the process (more black) but especially to create a specific electrolyte to treat different series of stainless steels, such as ferritic (e.g.: AISI 430) and austenitic manganese (e.g.: AISI 202) . This oxide presents a compact structure capable of giving excellent corrosion resistance and grows improving the chromium oxide naturally present on the surface of stainless steel. The black color of the marking oxide also guarantees excellent results from the aesthetic point of view, providing a high contrast with the stainless surface, not only on standard applications (company logo, data plates, codes, etc.) but also on large surface decorations for design and architecture purposes.
Electrochemical marking for instant permanent decoration of stainless steel surfaces / Orlando, G.; Giovanardi, R.. - (2015), pp. 399-407. (Intervento presentato al convegno 8th European Stainless Steel Conference Science and Market and Duplex Stainless Steel Conference and Exhibition, ESSC 2015 tenutosi a Congress Graz, aut nel 2015).
Electrochemical marking for instant permanent decoration of stainless steel surfaces
Giovanardi R.
2015
Abstract
The aim of this work is to study the electrochemical marking process that allows to obtain technical and decorative graphical effects on stainless steel by the controlled growth of protective oxides and to develop new electrolytes able to increase even more the technical and aesthetic result on different stainless steels series. The advantages of the electrochemical marking are: i) the possibility to obtain decorations with greater mechanical and chemical resistance compared to those obtained by screen printing and laser processes; ii) high process speed (few seconds); iii) the absence of heat input to the treated surface, unwelcome phenomenon that, in the case of laser marking, may lead to the deformation of the artifacts in particular on low sheet thicknesses or when realizing big logos; iv) high graphical definition; v) ecology: no solvents, acids or dangerous compounds needed; vi) low power consumption: possibility to use portable battery powered units. In particular, the aim of this work is to characterize the oxides obtained by electrochemical decoration on EN 1.4301/AISI 304 austenitic stainless steel in terms of corrosion resistance (by polarization curves), chemical composition (by Raman spectroscopy) and color (CIE Lab visible spectroscopy). The results obtained from the characterization were then used to formulate new compositions of the electrolyte that allow to improve the process (more black) but especially to create a specific electrolyte to treat different series of stainless steels, such as ferritic (e.g.: AISI 430) and austenitic manganese (e.g.: AISI 202) . This oxide presents a compact structure capable of giving excellent corrosion resistance and grows improving the chromium oxide naturally present on the surface of stainless steel. The black color of the marking oxide also guarantees excellent results from the aesthetic point of view, providing a high contrast with the stainless surface, not only on standard applications (company logo, data plates, codes, etc.) but also on large surface decorations for design and architecture purposes.
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