Formability of an anti-fingerprint clear coating on satin stainless steel sheet metal
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Since several years the application of stainless steel sheet metal with anti-fingerprint coating increases in the household appliance industry. These imperceptible clear coatings improve the cleaning characteristics. In essence, they reduce the adhesion and visibility of fingerprints on satin stainless steel surfaces. The thickness of these coatings amounts to a few micrometers. They are applied by the stainless steel manufacturer in a coil coating process. The curing procedure by ultraviolet radiation and the nanoparticle reinforced coating system cause a high hardness and a good scratch resistance. The final painted sheets are further processed e.g. to covering parts. The final processor does not spend any effort on varnishing or curing on-site. During forming operations a damage of the clear coating in the form of crack formation and delamination can be observed. This paper deals with experimental analyses for the identification and quantification of the deformation-induced damages to the coating considering different states of stress. On the basis of the results a coating-specific forming limit curve is defined, that can be used in forming simulations to forecast the occurrence of inacceptable coating damages. The validation of the forming limit curve of the coating is demonstrated in an exemplary comparison of a finite-element-method simulation and the coating damages of a real drawn part.
KeywordsSatin stainless steel Anti-fingerprint Clear coating Forming limit curve
The authors would like to thank the German Federation of Industrial Research Associations (AiF) and the federal ministry of economics and technology (BMWi) for funding this research project EFB/AiF 16386N "Umformtechnische Verarbeitung von Edelstahl mit Klarlackbeschichtung".
- 1.Papaiacovou P, Wiemer D, Mauro S (2005) Silver ice UV—Nirosta Klarlackbeschichtung gegen Fingerabdrücke, ThyssenKrupp techforum, company journal pp 23–27Google Scholar
- 2.Sepeur S (2006) Nano-X information, online product leaflet. http://www.nano-x.de/r3cms/user_upload/1232111364_Handout_AF_deu_060406.pdf
- 3.Otto A (2008) ThyssenKrupp stainless—stainless steel flat, markets and trends, ThyssenKrupp Field Day, 17th October 2008, conference presentation, p 19. http://www.thyssenkrupp.com/documents/fielddays/StainlessSteel_Markets_and_Trends.pdf
- 4.Roth C (2001) Funktionelle Schichten auf der Basis von Hybridpolymeren. Mat.-wiss. u. Werkstofftech. 32:753–758Google Scholar
- 5.BYK Chemie GmbH (2007) Nanotechnologie Additive, technical information leaflet L-NI 1, p 7. http://downloads.german-pavilion.com/downloads/pdf/exhibitor_22472.pdf
- 7.Schwalm R (2007) UV coatings—basics, recent developments and new applications. Elsevier Science, Amsterdam, p 19Google Scholar
- 8.ISO 12004-2:2008 (2009) Sheet and strip—determination of forming limit curves—part 2: determination of forming limit curves in the laboratory, Deutsches Institut für Normung e.V., Beuth Verlag GmbH, BerlinGoogle Scholar
- 9.ArcelorMittal (2006) Anwenderhandbuch—metallisch beschichteter Stahl, Arcelor Flat Carbon Steel Europe, PR-UM-MCO-DE 02/2006Google Scholar
- 10.ISO 4628-5:2003 (2004) Evaluation of degradation of coatings—designation of quantity and size of defects, and of intensity of uniform changes in apperance—part 5: assessment of degree of flaking, Deutsches Institut für Normung e.V., Beuth Verlag GmbH, BerlinGoogle Scholar