Patina nucleation on statuary bronze and brass

Blanca Rosales, Jacqueline Hidalgo, ROSA DE LAS MERCEDES VERA ARAVENA

Resultado de la investigación: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva

Resumen

This paper focuses on the analysis of natural and artificial patina formation on statuary bronze and brass. Short term natural exposures of polished to 0.25μm samples were carried out in soft marine and urban atmospheres up to first corrosion nucleous formation. Laboratory simplest patina were also performed in an immersion-emersion CEBELCOR type equipment in distilled water during fixed spans of time. Also their artificial degradation by SO 2 was simulated in the same equipment using urban synthetic rain water consisting on a 10 -4 M NaHSO 3 solution as electrolyte. The structures formed during these different experimental conditions were observed in an environmental scanning electron microscope coupled to an energy dispersive X-ray analyser. Electrochemical characterisation of artificially weathered bronze and brass allowed clarifying the role of alloying elements on initiation as on the simplest patina formation processes as compared to pure copper as reference . They also contributed to a better understanding of the patina protectiveness degradation observed in atmospheres containing the most aggressive antropogenic pollutant. These results also justify the significant corrosion rate decrease determined at present on the latest Atmospheric Corrosion studies carried out in Europe as a consequence of the great effort devoted in the last decades to SO 2 emissions control.

Idioma originalInglés
Título de la publicación alojada17th International Corrosion Congress 2008
Subtítulo de la publicación alojadaCorrosion Control in the Service of Society
Páginas1517-1527
Número de páginas11
EstadoPublicada - 2008
Publicado de forma externa
Evento17th International Corrosion Congress 2008: Corrosion Control in the Service of Society - Las Vegas, NV, Estados Unidos
Duración: 6 oct 200810 oct 2008

Serie de la publicación

Nombre17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
Volumen3

Conferencia

Conferencia17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
País/TerritorioEstados Unidos
CiudadLas Vegas, NV
Período6/10/0810/10/08

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