Effectiveness and harmful effects of removal sulphated black crust from granite using Nd:YAG nanosecond pulsed laser

被引:19
作者
Pozo, S. [1 ]
Barreiro, P. [2 ]
Rivas, T. [1 ]
Gonzalez, P. [2 ]
Fiorucci, M. P. [3 ]
机构
[1] Univ Vigo, ETSI Minas, Dpto Ingn Recursos Nat & Medio Ambiente, Vigo 36310, Spain
[2] Univ Vigo, ETSI Ind, Dpto Fis Aplicada, Vigo 36310, Spain
[3] Univ A Coruna, Ctr Invest Tecnolox CIT, Ferrol 15403, Spain
关键词
Laser cleaning; Cultural heritage; Black crust; Granite; GRAFFITI; IR;
D O I
10.1016/j.apsusc.2013.10.129
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Sulphated black crust is a common form of deterioration affecting stone used in monuments, usually occurs in contaminated atmospheres or urban environments. Its origin and cleaning have been studied extensively, for decades, in the case of carbonate rocks. Recent studies show that this form of alteration also affects granites. Scientific research on laser removal effectiveness of gypsum-rich black crust on granites needs to be scientifically addressed considering the inexistent references. This paper assesses the removal by laser of sulphate-rich black crusts on granite using the different harmonics of a Nd:YAG nanosecond pulsed laser (266 nm, 355 nm, 532 nm and 1064 nm). Effectiveness was evaluated using Scanning Electron Microscopy with Energy Dispersive X-ray Spectrometry (SEM-EDS), X-Ray Diffraction (XRD) and Attenuated Total Reflection-Fourier Infrared Transform Spectroscopy (ATR-FTIR). We also evaluated the effect of the radiation on granite-forming minerals and on the colour of the stone using Scanning Electron Microscopy and spectrophotometry colour measurements respectively. SEM-EDS, XRD and ATR-FTIR analyses show that the higher the wavelength, the more efficient the cleaning, so samples cleaned using 1064 nm pulsed laser recovered its original colour. Nevertheless, the Nd:YAG laser did not completely eliminate the crust, and gypsum crystals remaining on the rock surface are observed, even at the most effective wavelength. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:309 / 313
页数:5
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