[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)
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