Silver artifacts protection by anticorrosive coatings

Gouda, V; Ghany, NA; Awad, A; Novakovic, J; Vassiliou, P

dc.contributor.author	Gouda, V	en
dc.contributor.author	Ghany, NA	en
dc.contributor.author	Awad, A	en
dc.contributor.author	Novakovic, J	en
dc.contributor.author	Vassiliou, P	en
dc.date.accessioned	2014-03-01T02:51:48Z
dc.date.available	2014-03-01T02:51:48Z
dc.date.issued	2008	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35661
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84865018326&partnerID=40&md5=7141c617911bf325ca6895e70bf7a73d	en
dc.subject	Artifacts	en
dc.subject	Coating system	en
dc.subject	Hexadecane-thiol	en
dc.subject	Nano-pigmented alumina	en
dc.subject	Paraloid	en
dc.subject	Silver	en
dc.subject.other	Acrylic co-polymers	en
dc.subject.other	Aluminum oxides	en
dc.subject.other	Anti-corrosive coatings	en
dc.subject.other	Artifacts	en
dc.subject.other	Atmospheric pollutants	en
dc.subject.other	Coating system	en
dc.subject.other	Cultural heritages	en
dc.subject.other	Electrochemical reductions	en
dc.subject.other	Electrochemical testing	en
dc.subject.other	Galvanic coupling	en
dc.subject.other	Hexadecane-thiol	en
dc.subject.other	Immersion testing	en
dc.subject.other	Nano-Al	en
dc.subject.other	Organic vehicles	en
dc.subject.other	Paraloid	en
dc.subject.other	Protection systems	en
dc.subject.other	Protective properties	en
dc.subject.other	Silver sulfides	en
dc.subject.other	Silver tarnish	en
dc.subject.other	System capabilities	en
dc.subject.other	Visual effects	en
dc.subject.other	Visual observations	en
dc.subject.other	Acrylics	en
dc.subject.other	Alumina	en
dc.subject.other	Atmospheric corrosion	en
dc.subject.other	Coatings	en
dc.subject.other	Corrosion prevention	en
dc.subject.other	Electrolytic reduction	en
dc.subject.other	Paraffins	en
dc.subject.other	Silver	en
dc.subject.other	Silver compounds	en
dc.subject.other	Silver alloys	en
dc.title	Silver artifacts protection by anticorrosive coatings	en
heal.type	conferenceItem	en
heal.publicationDate	2008	en
heal.abstract	Many objects of cultural heritage constituted of bulk or plated silver or alloys are often displayed in museum show-cases or are kept in depositories. The silverworks tarnish with time by reactions with atmospheric pollutant elements, namely sulfides forming silver sulfide. The blackish films thus formed make these artefacts inappropriate to display and have to be dealt with. Tarnish can be removed with a silver polish, by a chemical dip, an electrochemical reduction method or galvanic coupling with aluminium. Several methods have been developed to reduce silver tarnish such as silver alloying, surface treatment and coating. The protection system employed has to follow the Venice Charter, to be removable and not to change the aesthetics of the object to be protected. In this study, silver alloys have been tested for corrosion under accelerated atmospheric corrosion conditions. A system of hexadecanethiol (HDT) has been tried on silver coupons. An acrylic copolymer has also been used as the organic vehicle for dispersed nano-pigment of aluminum oxide. Several percentages of pigments have been tried to check on the system capabilities, without altering the visual effects of the surface. The different coating systems has been prepared and either brushed on the surface of the silver coupons or the silver coupons were immersed in the coating system. Alternate immersion testing in sulfide solution has been tried on the coupons. Electrochemical testing, visual observations and gloss measurements showed that the coating with 2% nano-Al2O3 and the hexadecane-thiol exhibit better protective properties than the plain acrylic. © 2009 by NACE International.	en
heal.journalName	17th International Corrosion Congress 2008: Corrosion Control in the Service of Society	en
dc.identifier.volume	2	en
dc.identifier.spage	1078	en
dc.identifier.epage	1090	en