Low-Pressure Hydrogen Plasma: An Assessment of Its Application on Archaeological Iron

Schmidt-Ott, Katharina; Boissonnas, Valentin

doi:10.2307/1506847

Cited by 13 publications

(11 citation statements)

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“…Moreover, the procedure was not applicable to coloured plates and ungilded plates . The use of low‐pressure non‐equilibrium plasmas has been recently reported also for the cleaning of historical photographs and archaeological artefacts . None of the cleaning methods of the past allowed selective treatments on specific areas, until laser cleaning was introduced in the late 1990s .…”

Section: Introductionmentioning

confidence: 99%

“…None of the cleaning methods of the past allowed selective treatments on specific areas, until laser cleaning was introduced in the late 1990s . The laser cleaning process is based on thermal ablation, relying on the different material removal thresholds that characterize corrosion layer and silver, allowing selective removal of corrosion with “no apparent damage to the image itself” or “minimal removal of vital information” . Atmospheric pressure non‐equilibrium plasmas are a promising tool for the cleaning of open air surfaces like monuments walls or for selective treatment of surfaces …”

Section: Introductionmentioning

confidence: 99%

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Atmospheric pressure non-equilibrium plasma cleaning of 19th century daguerreotypes

Boselli¹,

Chiavari

Colombo³

et al. 2016

Plasma Process. Polym.

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In the work, the feasibility of using atmospheric pressure non‐equilibrium plasmas to clean the surface of a deteriorated 19th century daguerreotype has been examined and a proof‐of‐principle demonstration is given. The daguerreotype was treated by means of both a commercial plasma jet source (kINPen 09, Neoplas Tools GmbH) and a specially designed Dielectric Barrier Discharge (DBD) plasma source operated within a controlled volume at atmospheric pressure, by using a argon‐hydrogen gas mixture (H2 content: 35% vol.) to remove corrosion products, without immersion of the substrate in solvents or chemicals. The effectiveness of plasma treatment in removing tarnishing products while preventing damage to the fragile image has been evaluated analysing the surface by means of scanning electron microscopy (SEM) with energy dispersive microprobe (EDS) for localized elemental analysis, micro‐Raman and ATR‐FTIR spectroscopy for phase identification.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atmospheric pressure non-equilibrium plasma cleaning of 19th century daguerreotypes

Boselli¹,

Chiavari

Colombo³

et al. 2016

Plasma Process. Polym.

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“…The latter can either be present in the original corrosion layer or be produced when the Fe 3+ phases of the original layer are abiotically reduced by Na2S. In fact, the reduction of iron in the abiotic control has already been documented in similar conditions [14]. On the abiotic control, lepidocrocite and goethite were detected, but also siderite and vivianite ( Figure 6).…”

Section: Molecular Composition Of the Corrosion Layermentioning

confidence: 82%

“…However, this method is restricted to large marine finds, as there is a significant loss of the surface and a lack of control over the amount of salts extracted and the corrosion products reduced during hydrogen bubbling [3]. Finally, plasma treatment is usually applied as a pre-treatment, as it creates cracks and fissures that will facilitate the diffusion of chloride ions during a successive alkaline bath [14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Biogenic Passivating Layers on Corroded Iron

et al. 2020

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This study evaluates mechanisms of biogenic mineral formation induced by bacterial iron reduction for the stabilization of corroded iron. As an example, the Desulfitobacterium hafniense strain TCE1 was employed to treat corroded coupons presenting urban natural atmospheric corrosion, and spectroscopic investigations were performed on the samples’ cross-sections to evaluate the corrosion stratigraphy. The treated samples presented a protective continuous layer of iron phosphates (vivianite Fe2+3(PO4)2·8H2O and barbosalite Fe2+Fe3+2(PO4)2(OH)2), which covered 92% of the surface and was associated with a decrease in the thickness of the original corrosion layer. The results allow us to better understand the conversion of reactive corrosion products into stable biogenic minerals, as well as to identify important criteria for the design of a green alternative treatment for the stabilization of corroded iron.

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“…Nowadays, plasma chemical reduction is used at several institutions, for example Swiss National Museum (Centre for Conservation, Zurich, Switzerland) [7], National Technical University of Athens (Laboratory of Physical Chemistry, Greece) [8] …”

Section: Introductionmentioning

confidence: 99%

Application of low-temperature low-pressure hydrogen plasma: treatment of artificially prepared corrosion layers

et al. 2014

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Abstract:The aim of this work is the application of lowtemperature low-pressure hydrogen plasma on artificially prepared corrosion layers, so called plasma chemical reduction. It is necessary to use samples with artificially prepared corrosion layers because it is impossible to use the real artifacts for fundamental research. The bronze was chosen as a sample material. Formation of corrosion layers on the bronze samples was carried out in concentrated hydrochloric acid vapors with the addition of sand. The radio-frequency hydrogen plasma was generated in the flowing regime at a pressure of 160 Pa. Different values of supplied power were chosen as well as different discharge modes: continuous or pulsed mode with varied duty cycles. By the combination of supplied power and mode factors, we selected two values of effective power. The process of plasma chemical reduction was monitored by optical emission spectroscopy (OES) and simultaneously, the sample temperature was measured. Rotational temperatures were calculated from OH radicals spectra. Changes in the structure and elemental composition were determined using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX).

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Low-Pressure Hydrogen Plasma: An Assessment of Its Application on Archaeological Iron

Cited by 13 publications

References 0 publications

Atmospheric pressure non-equilibrium plasma cleaning of 19th century daguerreotypes

Atmospheric pressure non-equilibrium plasma cleaning of 19th century daguerreotypes

Investigation of Biogenic Passivating Layers on Corroded Iron

Application of low-temperature low-pressure hydrogen plasma: treatment of artificially prepared corrosion layers

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