3-mercapto-propyl-trimethoxy-silane (PropS-SH), with or without the addition of nanoparticles, was tested through natural exposure in the coastal town of Rimini (Italy), as a protective coating for outdoor quaternary bronze (Cu-Sn-Zn-Pb). The first results of these tests are presented here: uncoated and coated samples were exposed both in sheltered and unsheltered conditions with respect to the action of rainwater. Sample surfaces were periodically characterized by SEM, EDS, micro-Raman and XRD, and the leaching rain was monthly collected, in order to evaluate the release of the alloying metals by Atomic Absorption Spectrometry (AAS). The results showed that micro-scale cracking and spalling phenomena took place during exposure, partly limiting the protective efficiency. In order to identify the factors responsible for coating damage in outdoor conditions, exposure to temperature/UV cycles in a climatic chamber were carried out. The results showed the strong influence of UV radiation on coating performance.
C. CHIAVARI, E. BERNARDI, B. LENZA, C. MARTINI, I. VASSURA, A. MOTORI, et al. (2013). Organosilane coatings applied on bronze: natural exposure and exposure to temperature/UV cycles. London : European Federation of Corrosion (EFC).
Organosilane coatings applied on bronze: natural exposure and exposure to temperature/UV cycles
CHIAVARI, CRISTINA;BERNARDI, ELENA;LENZA, BENINA;MARTINI, CARLA;VASSURA, IVANO;MOTORI, ANTONIO;
2013
Abstract
3-mercapto-propyl-trimethoxy-silane (PropS-SH), with or without the addition of nanoparticles, was tested through natural exposure in the coastal town of Rimini (Italy), as a protective coating for outdoor quaternary bronze (Cu-Sn-Zn-Pb). The first results of these tests are presented here: uncoated and coated samples were exposed both in sheltered and unsheltered conditions with respect to the action of rainwater. Sample surfaces were periodically characterized by SEM, EDS, micro-Raman and XRD, and the leaching rain was monthly collected, in order to evaluate the release of the alloying metals by Atomic Absorption Spectrometry (AAS). The results showed that micro-scale cracking and spalling phenomena took place during exposure, partly limiting the protective efficiency. In order to identify the factors responsible for coating damage in outdoor conditions, exposure to temperature/UV cycles in a climatic chamber were carried out. The results showed the strong influence of UV radiation on coating performance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
