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The evolution of outdoor copper patina
KTH, Tidigare Institutioner                               , Materialvetenskap.ORCID-id: 0000-0003-2206-0082
KTH, Tidigare Institutioner                               , Materialvetenskap.ORCID-id: 0000-0002-9453-1333
2002 (Engelska)Ingår i: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 44, nr 3, s. 425-450Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A general reaction scheme has been deduced which describes the evolution of the copper patina, including altogether eight compounds, formed upon exposure to outdoor atmospheric environments. The scheme is based on data obtained from altogether 39 exposure sites, using a recently developed method for quantitative X-ray powder diffraction analysis of up to 8 year old patina still adhering to the copper substrate. In all cases, cuprite forms initially and continuously throughout the atmospheric exposure. Three main sequences have been identified on sheltered copper, representing different reaction routes in sulfur- or chlorine-dominated environments. In less sulfur-polluted environments, posnjakite forms on the cuprite as a precursor to brochantite. In more sulfur-polluted environments, strandbergite is a precursor to antlerite. Both reaction routes may operate simultaneously and the main route may change from the more sulfur-polluted to the less polluted route, as a result of decreased pollutant levels. In chlorine-dominated environments the initial cuprite formation is followed by nantokite and atacamite. By far the most dominating sequence on unsheltered copper includes cuprite, followed by posnjakite and brochantite formation.

Ort, förlag, år, upplaga, sidor
2002. Vol. 44, nr 3, s. 425-450
Nyckelord [en]
copper, X-ray diffraction, atmospheric corrosion, atmospheric corrosion
Identifikatorer
URN: urn:nbn:se:kth:diva-21233ISI: 000173095500004OAI: oai:DiVA.org:kth-21233DiVA, id: diva2:339931
Anmärkning
QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Odnevall Wallinder, IngerLeygraf, Christofer

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