Silver artifacts protection by anticorrosive coatings

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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 2014-03-01T01:58:48Z
dc.date.available 2014-03-01T01:58:48Z
dc.date.issued 2009 en
dc.identifier.issn 04492285 en
dc.identifier.uri http://hdl.handle.net/123456789/28739
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-79960540940&partnerID=40&md5=045a58bf90e5141f9f3799b415d78b04 en
dc.subject Artifacts en
dc.subject Coating system en
dc.subject Hexadecane-thiol en
dc.subject Nano-pigmented alumina and paraloid en
dc.subject Silver en
dc.title Silver artifacts protection by anticorrosive coatings en
heal.type journalArticle en
heal.publicationDate 2009 en
heal.abstract MANY objects of cultural heritage constituted of bulk, plated silver or alloys are often displayed in museum show-cases or 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 artifacts 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 aluminum. 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 hexadecane-thiol (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 have 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% nanc-Al2O3 and the hexadecane-thiol exhibit better protective properties than the plain acrylic. en
heal.journalName Egyptian Journal of Chemistry en
dc.identifier.issue SPEC. ISSUE en
dc.identifier.spage 29 en
dc.identifier.epage 45 en

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