Reflectance curves and CIE L* a* b* parameters to describe patina characteristics and corrosion mechanism on bronze alloys
Keywords:
Color, lighting, visual perception, digital, designAbstract
Metals have had in the past and still have nowadays many applications. One of the oldest and most frequently used metals has been copper and one of its alloys: bronze, which is copper and tin alloy. Bronze is often used because of its good mechanical properties and for its colour range when corroded, which can give different aesthetic results to the artifacts. The colour of bronze depends on the concentration of the main components and any additional alloying elements. Not only gives the composition a specific colour to the alloy, it also influences the corrosion behaviour. This research focuses on the correlation between urban and marine environments and the corrosion behaviour of three bi-component copper-tin alloys used in different historical and artistic artifacts using colorimetry. Colorimetric measurements are useful because they are non-destructive and can be done using compact instruments, which are portable, implying that in-situ measurements can be done in a relatively rapid manner [1]. [...]
References
M. Bacci, M. Piccolo, S. Porcini, B. Radicati, “Non- destructive spectrophotometry and colour measurements applied to the study of work of art”, Techne 5 (1997) 28.
E. Franceschi, “Synthese de dix ans de recherches sur la premiere metallurgie en Ligurie (1988-98)”, Proceedings of 2nd International Congress on Science and Technology for the Safeguard of Cultural Heritage in Mediterranean Basin, Elsevier, 2000, 521-525.
D.A. Scott, “Copper and Bronze in art: corrosion, colorants and conservation”, J. Paul Getty Trust Pubblication, Los Angeles 2002.
E. Franceschi, M. Giorgi, G. Luciano, D. Palazzi, E. Piccardi, “Archeometallurgical characterization of two small copper-based statues from the Cividale Museum (Friuli, Italy)”, Journal of Cultural Heritage 52 (2004), 205- 211.
E. Franceschi, P. Letardi, G. Luciano, “Colour measurements on patinas and coating system for outdoor bronze monuments”, Journal of Cultural Heritage 7 (2006), 166-170.
G. Luciano, R. Letardi, P. Letardi, “Principal component analysis of colour measurements of patinas and coating system for outdoor bronze monuments”, Journal of Cultural Heritage 10 (2009), 331-337.
L. Gianni; M. Cavallini; S. Natali, A. Adriaens, “Wet and dry accelerated tests in a spray chamber to understand the effects of acid rain frequencies on bronze corrosion”, International Hournal of Electrochemistry Science 8 (2013), 1822-1838;
L. Gianni, G.E. Gigante, M. Cvallini, A. Adriaens, “Corrosion of bronzes by extended wetting with singul versus mixed acid pollutants”, Materials 7 (2014), 3353- 3370; doi:10.3390/ma/7053353;
Ingelbrecht C., A. Adriaens, E.A. Maier, Certification of Arsenic, Lead, Tin and Zinc (Mass Fractions) in Five Copper Alloys CRM 691. EUR 19778/1, Office for Official Publications of the European Communities, Luxembourg, 2001, 53 pp., ISBN 92-894-0741.
International Organization for Standardization, ISO 9223: 1992, “Corrosion of metals and alloys- Corrosivity of the atmospheres- Classification”, www.iso.org.
C. Chiavari, A. Colledan, A. Frignani, G. Brunoro, “Corrosion evaluation of traditional and new bronzes for artistic casting”, Materials Chemistry Physics 95 (2006), 252-259.
A. Granic, H. Otmacic, E. Stupnisek-Lisac, M. Kharshan, A. Furman, “Bronze protection in artificial seawater”, Meet. Abstr. – Electrochemical Society 902, 1712 (2009)
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The "Cultura e Scienza del Colore - Color Culture and Science" journal is registered at the Court of Milan at n.233 of 24.06.2014.
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