This article is part of the Journal of Raman Spectroscopy special issue entitled “Raman spectroscopy in art and archeology” edited by Juan Manuel Madariaga and Danilo Bersani.
Raman investigation of artificial patinas on recent bronze‒part II: urban rain exposure†
Version of Record online: 16 JUL 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Special Issue: Raman spectroscopy in art and archaeology
Volume 43, Issue 11, pages 1587–1595, November 2012
How to Cite
Kosec, T., Ropret, P. and Legat, A. (2012), Raman investigation of artificial patinas on recent bronze‒part II: urban rain exposure. J. Raman Spectrosc., 43: 1587–1595. doi: 10.1002/jrs.4124
- Issue online: 21 NOV 2012
- Version of Record online: 16 JUL 2012
- Manuscript Accepted: 2 MAY 2012
- Manuscript Revised: 16 APR 2012
- Manuscript Received: 12 DEC 2011
- chemical patina;
- nitrate patina;
- chloride patina;
- Raman spectroscopy
Patinas form spontaneously on copper and high copper alloys when exposed to humidity and air. They usually protect the underlying metal from corrosion. Bronze is often chemically patinated by artists to achieve an antique appearance. However, in the case of chemical patinations on bronze, there is a lack of studies about their change over time during exposure to different types of environments.
Recent types of bronze, brown patina and two green type patinas (green chloride and green nitrate patina) applied over a brown patina, were selected for testing. The aim of the present study was to monitor the transformation process of chemically formed patinas and of the bronze itself after exposure to simulated urban acid rain, for a period of 35 days. The structures of the patina and corrosion products were characterized by scanning electron microscopy (SEM) and Raman spectroscopy.
Three differently coloured patinas were scraped off from the bronze statue of the poet France Prešeren, two green type patinas and one brown type, to predict the probable influences of the environment, the base alloy and previously used patination techniques. Copyright © 2012 John Wiley & Sons, Ltd.