Laser Cleaning of Metal Surface — Laboratory Investigations

Mottner, Peter; Wiedemann, Günter; Haber, Georges-Pascal; Conrad, Wolfgang; Gervais, Antoine

doi:10.1007/3-540-27176-7_10

Cited by 15 publications

(9 citation statements)

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“…In all examples, the section of each object cleaned mechanically using a scalpel-produced superior cleaning results and greater retention of surface detail. Further work will be conducted to explore whether better results can be obtained using lasers with different wavelengths and pulse durations, as these parameters have been shown to affect the laser cleaning of metals (e.g., [10,18]). …”

Section: Discussionmentioning

confidence: 99%

Laser Cleaning Tests on Archaeological Copper Alloys Using an ND:YAG Laser

Korenberg

Baldwin

2006

Laser Chemistry

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Laser cleaning tests were performed on five archaeological copper alloy objects using a Q-switched Nd:YAG laser at 1064 nm. As a comparison, a section of each object was cleaned mechanically. Prior to cleaning, cross-sections were prepared to characterise the corrosion crust and help to locate the position of the original surface. Laser cleaning was not successful at removing burial deposits on two of the objects. For the other three objects, the laser removed most of the corrosion crust. This was not always satisfactory, as cleaning was sometimes accompanied by the loss of the original surface. In addition, laser-cleaned surfaces were matt compared to mechanically cleaned surfaces. In some instances, the former had a disfiguring purple hue which was attributed to the formation of particles that could be seen when examining the surface using scanning electron microscopy. For all the objects examined here, superior results were obtained by mechanical cleaning.

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Section: Discussionmentioning

confidence: 99%

Laser Cleaning Tests on Archaeological Copper Alloys Using an ND:YAG Laser

Korenberg

Baldwin

2006

Laser Chemistry

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“…Recently, lasers have been used for the removal of different corrosion layers, encrustations, and coatings on archaeological and historical metal objects [14][15][16][17][18][19][20][21][22][23][24][25]. The application of lasers in conservation faces the challenge to deal with some issues, among others the preservation of the original surface and the formation of unwanted laser induced alteration layers [26,27].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of laser cleaning for the restoration of tarnished silver artifacts

Palomar

Oujja

Llorente

et al. 2016

Applied Surface Science

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a b s t r a c tIn this study we evaluate the laser cleaning of tarnished pure and sterling silver substrates using a nanosecond Q-switched Nd:YAG laser at 1064, 532 and 266 nm. To assess the effects associated with cyclic laser cleaning treatments, several cycles of tarnishing followed by laser cleaning were applied on silver coupons that were characterized by gravimetry, colorimetry, scanning electron microscopy, X-ray photoelectron spectroscopy and micro-Raman spectroscopy. According to the obtained results, none of the three wavelengths is recommended for laser cleaning of pure silver objects, while for sterling silver artifacts, the visible laser wavelength of 532 nm seems the most appropriate.

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“…Studies on the laser cleaning of corroded metal alloys often characterize the effects of variances in laser wavelength and/or pulse duration on corrosion removal and metal substrate preservation [1,3,21,24,25,27,28]. Considering the diversity of corrosion compositions and laser parameters, it is unsurprising that these studies do not present complete agreement on optimized factors in the laser cleaning of iron.…”

Section: Introductionmentioning

confidence: 99%

“…It is generally agreed that a shorter pulse duration reduces thermal effects and lessens the risk of micromelting [1,24,33]. Hypotheses toward laser parameter optimization posit the critical roles of laser fluence [3,21,27,28], materials absorptivity [1,3,23,24,27], and thermal conductivity [1,34] in the safe and effective removal of corrosion layers.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-dependent absorption and scattering effects on laser cleaning of a corroded iron alloy European scale armor

Yandrisevits¹,

Londero²,

Carò³

et al. 2017

Proceedings of the International Conference LACONA XI

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This research seeks to optimize Nd:YAG laser cleaning parameters for the removal of corrosion products on historic iron alloy surfaces. This article presents the treatment of a 19th-century, European scale armor jazeran in the collection of the Arms and Armor Department at The Metropolitan Museum of Art. Laser cleaning was coupled with traditional mechanical cleaning techniques to increase the time efficiency of treatment while best preserving the composite material construction of the artifact and the aesthetic expectations of treatment. Laser cleaning using an 8 ns, Q-switched, Nd:YAG laser at 532 nm was found more effective at corrosion removal and less damaging to the underlying metal surface than laser cleaning at 1064 nm. Wavelength-dependent absorption and scattering effects on the laser cleaning of the corroded iron alloy surfaces were investigated. The composition, morphology, and stratigraphy of the corrosion layers were characterized and the effects of laser cleaning of these corrosion layers at 1064 nm and 532 nm were examined using stereomicroscopy, scanning electron microscopy -energy dispersive spectroscopy and back-scattered and secondary electron imaging, Raman spectroscopy, Fourier transform -infrared spectroscopy, and thermally assisted hydrolysis and methylation -gas chromatography -mass spectrometry. It was found that the success of the 532 nm laser cleaning is consistent with the green laser's more resonant energy absorption and decreased scattering length as compared to 1064 nm. These data were used to optimize the optical parameters of the laser energy interaction with the corrosion products to develop more effective and safer laser cleaning profiles for the removal of ferrous corrosion layers on the historic iron alloy surface.

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Laser Cleaning of Metal Surface — Laboratory Investigations

Cited by 15 publications

References 0 publications

Laser Cleaning Tests on Archaeological Copper Alloys Using an ND:YAG Laser

Laser Cleaning Tests on Archaeological Copper Alloys Using an ND:YAG Laser

Evaluation of laser cleaning for the restoration of tarnished silver artifacts

Wavelength-dependent absorption and scattering effects on laser cleaning of a corroded iron alloy European scale armor

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