Aesthetic coatings for silver based alloys with improved protection efficiency

Grassini, S; Angelini, E; Mao, Y; Novakovic, J; Vassiliou, P

dc.contributor.author	Grassini, S	en
dc.contributor.author	Angelini, E	en
dc.contributor.author	Mao, Y	en
dc.contributor.author	Novakovic, J	en
dc.contributor.author	Vassiliou, P	en
dc.date.accessioned	2014-03-01T02:47:16Z
dc.date.available	2014-03-01T02:47:16Z
dc.date.issued	2011	en
dc.identifier.issn	0300-9440	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33046
dc.subject	EIS	en
dc.subject	Nanopigments	en
dc.subject	PECVD	en
dc.subject	Silver artefacts	en
dc.subject	Thin films	en
dc.subject.classification	Chemistry, Applied	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.other	Accelerated ageing tests	en
dc.subject.other	Barrier effects	en
dc.subject.other	Chemical treatments	en
dc.subject.other	Coated sample	en
dc.subject.other	Corrosion mechanisms	en
dc.subject.other	Corrosion products	en
dc.subject.other	Dithionate	en
dc.subject.other	EIS	en
dc.subject.other	Environmental agents	en
dc.subject.other	Low pressure plasma treatment	en
dc.subject.other	Low-pressure hydrogen	en
dc.subject.other	Nano-pigments	en
dc.subject.other	Plasma treatment	en
dc.subject.other	Protection efficiency	en
dc.subject.other	XRD analysis	en
dc.subject.other	Alkalinity	en
dc.subject.other	Deposition	en
dc.subject.other	Electrochemical corrosion	en
dc.subject.other	Electrochemical impedance spectroscopy	en
dc.subject.other	Glow discharges	en
dc.subject.other	Plasma deposition	en
dc.subject.other	Plasmas	en
dc.subject.other	Silicon compounds	en
dc.subject.other	Silver	en
dc.subject.other	Silver alloys	en
dc.subject.other	Testing	en
dc.subject.other	Thin films	en
dc.subject.other	Vapor deposition	en
dc.subject.other	Protective coatings	en
dc.title	Aesthetic coatings for silver based alloys with improved protection efficiency	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/j.porgcoat.2011.04.003	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.porgcoat.2011.04.003	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Ag-based alloy samples are submitted to innovative chemical and low pressure plasma treatments that lead to the deposition of aesthetic coatings with improved corrosion protection properties. The chemical treatments are carried out in alkaline dithionate solution in order to clean the surface and eventually remove the patina on aged samples, then the surface is protected by a Paraloid B72 coating containing different percentages of Al2O3 nanopigments. The plasma treatments are carried out by deposition of SiOx thin films in plasma fed with TEOS, Ar and O-2. Before the PECVD deposition, a glow discharge in a low pressure hydrogen plasma eventually removes tarnishing, reducing the corrosion products layer back to silver. The coating protective effectiveness is assessed by means of electrochemical impedance spectroscopy and accelerated ageing tests. The corrosion mechanism of the coated samples is investigated by XRD analyses. Both the chemical and the plasma treatments show satisfactory results from an aesthetic point of view and good barrier effect against aggressive environmental agents. (C) 2011 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Progress in Organic Coatings	en
dc.identifier.doi	10.1016/j.porgcoat.2011.04.003	en
dc.identifier.isi	ISI:000294574600021	en
dc.identifier.volume	72	en
dc.identifier.issue	1-2	en
dc.identifier.spage	131	en
dc.identifier.epage	137	en