Analysis of selective laser cleaning of patina on bronze coins

Plasma Physics by Laser and Applications 2013 Conference

Buccolieri, G.^1 ; Nassisi, V.^1 ; Torrisi, L.^3 ; Buccolieri, A.^2 ; Castellano, A.^1 ; Di Giulio, M.^1 ; Giuffreda, E.^1 ; Delle Side, D.^1 ; Velardi, L.^1

Università Del Salento, Dipartimento di Matematica e Fisica, via Arnesano, Lecce 73100, Italy^1

Università Del Salento, Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, via Monteroni, 73100, Lecce, Italy^2

Università di Messina, Dipartimento di Fisica e Scienze della Terra, V. S. d'Alcontres 31, 98166 S. Agata (ME), Italy^3

关键词: Bronze coins;    Chlorine concentration;    Energy-dispersive X-ray fluorescence analysis;    Exposed to;    Laser cleaning;    Laser wavelength;    Metal surfaces;    Physical process;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/508/1/012032/pdf
DOI  :  10.1088/1742-6596/508/1/012032

来源: IOP

【 摘 要 】

The patina, is the result of a large number of chemical, electrochemical and physical processes which occur spontaneously during interaction of metal surfaces with the environment. In this work we want to analyze and remove the patina in artefacts, exposed to atmosphere for various decades. Here, experimental results about the laser cleaning of bronze coins by KrF (248 nm) and Nd:YAG (532 nm) lasers are reported. Both laser wavelengths were efficient to reduce the chlorine concentration on the surface of the coins more than 80 %, as demonstrated by Energy Dispersive X-Ray Fluorescence analyses.