Search results for " patina"
showing 3 items of 3 documents
Characterization of traditional artificial patinas on copper using the voltammetry of immobilized particles
2020
[EN] The voltammetry of immobilized particles methodology (VIMP) is used to characterize the composition of artificial patinas on copper. The voltammetric response of carbonate-, nitrate-, chloride-, sulfate-, and sulfide-based patinas is described using sub-microsamples attached to graphite electrodes in contact with aqueous acetate buffer. Patina-characteristic voltammetric profiles are obtained for the different artificial patinas that can be recognized using the generalized Tafel analysis of the voltammetric curves. VIMP data could also provide layer-by-layer information about composition and compactness/crystallinity of the patinas for which a simplified theoretical modeling is present…
Integrated analytical methodologies for the study of corrosion processes in archaeological bronzes
2011
Abstract The investigations on structure and micro-chemical composition of archaeological metal alloys are needed in archaeometry. The aim of this study is devoted both to acquire information about their provenance and production technology, and to improve our understanding about the corrosion processes. In this paper we present the study of the corrosion phenomena of bronze samples, laboratory-made according to binary, ternary and quaternary alloys typical of Roman archaeometallurgical production through an integrated methodology based on the use of non or micro invasive physical techniques. Among the analysed samples, two were artificially aged through burial in the archaeological site of…
Il rumore del tempo e la patina dell'architettura
2014
All’interno del libro che intende essere un contributo su un tema complesso e, forse, tra i più travisati della cultura architettonica come quello dell'architettura mediterranea, si inserisce il saggio “Il rumore del tempo e la patina dell’architettura”. In tale scritto l’autore tratteggia il ruolo del tempo, cronologico ed atmosferico, come uno dei materiali più preziosi dell’architettura. Sciascia entra in argomento ricordando il comportamento sui generis del pittore E. Munch che sottoponeva le sue tele alla cosiddetta “cura da cavalli”, lasciandole esposte alle intemperie perché convinto che i colori si combinassero meglio e conclude riferendosi all’esperienza della casa di Luis Barragán…