Chemical and physical characterization of artificial patinas obtained on artistic bronzes and coppers by using the 19th century Western traditional patination techniques and recipes by means of SEM-EDS, light microscopy and ATR/FT-IR has been done in previous studies. To prevent the natural processes of decay and to develop and improve the treatments of conservation and restoration of artistic bronzes meaning statues and sculptures, it is important understanding the patination processes and the knowledge of artificially corroded surfaces. [Fondazione Bruno Kessler - IRST, Centro per la Ricerca Scientifica e Tecnologica, Trento (Italy) SIMS has proved to be a suitable analytical technique for analyzing small amounts of material with high atomic sensitivity (ppm or even ppb) and highīalta, I.Z., E-mail: [National Research Institute for Conservation and Restoration, Calea Victoriei 12, Sector 3, 030026 Bucharest (Romania) Pederzoli, S.
The elemental and chemical analysis, either on a surface monolayer or in a depth profile, by using the Secondary Ion Mass Spectrometry (SIMS) and X-ray Photoelectron Spectroscopy (XPS) techniques, can provide this kind of information, unique at trace-level sensitivity. Further in-depth investigation is required to be carried out in order to better understand the patinas mechanisms of formation and the layers kinetics of growth. Differences in morphology (structure, thickness, porosity, adherence, compactity, uniformity, homogeneity) and also in composition, on both artistic cast bronze and pure copper patinas, were clearly evidenced. de Quimica, Casilla 4059, Valparaiso, Chile FAX 56 32 23-9254 (Chile)ĭynamic secondary ion mass spectrometry and X-ray photoelectron spectroscopy on artistic bronze and copper artificial patinasīalta, I.Z. [DEICOR, CITEFA, Zufriategui 4380, (1603) Villa Martelli, Argentina PAX 54 1 709-3210 Rosa Vera Universidad Catolica de Valparaiso, Inst. (Author)įormation and evaluation of artificial patinas over copper Formacion y evaluacion de patinas artificiales sobre cobreĮnergy Technology Data Exchange (ETDEWEB) the others three ones present different failures as less adherence, high porosity and basic metal exfoliation. Starting from obtained results through different techniques it was concluded that the green patinas, as artificial as the naturally formed, as well as those of the best protector power. The corrosion products composition was determined by X-ray diffraction and W spectroscopy.
It was applied potential kinetics polarizations, scanning electron microscopy (Sem) and surface analysis EDAX. The protective properties of the patinas formed on copper as like artificial way (blue, green, violet, and maroon) as natural way out in the open which were evaluated by means of different characterization techniques. In patinas formed in laboratory on the contrary, to get morphology and a defined chemical composition, allowing its accelerated formation and an uniform attack, with a reproducible and controllable metal corrosion velocity. They were required at least three years by essaying in the atmospheres where the patina is naturally formed for a long term information disposition about its protector power, its stabilization velocity and its attack morphology suffered by the metal. The unprecise characteristic of the environmental parameters determines passive variable properties in the formed corrosion products out in the open. International Nuclear Information System (INIS) Formation and evaluation of artificial patinas over copper
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