The use of subcritical fluids for the stabilisation of archaeological iron: an overview

González, Néstor G.; Mardikian, Paul; Nasanen, Liisa; Drews, Michael J.

doi:10.1533/9781782421573.5.434

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…The sub‐critical stabilisation of archaeological artefacts has been studied in the field of the conservation of our metallic heritage. Former studies have proven the desalination efficiency of the process on artefacts from ferrous cultural heritage .…”

Section: Discussionmentioning

confidence: 99%

“…The present results were obtained at 160 °C. The pressure, which is not a determinant parameter in these conditions, was set to 35 bars .…”

Section: Methodsmentioning

confidence: 99%

“…In these hydrothermal conditions, several tests have been conducted to optimise the dechlorination parameters . The common temperature and pressure used for sub‐critical desalination is 180 °C and 40 bar, respectively, taking into consideration the duration of treatment, its effectiveness and the technical parameters of the autoclave .…”

Section: Introductionmentioning

confidence: 99%

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Corrosion product transformations in alkaline baths under pressure and high temperature: The sub‐critical stabilisation of marine iron artefacts stored under atmospheric conditions

Bayle

Viviés²,

Memet³

et al. 2015

Materials & Corrosion

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International audienceIn the context of conservation of ferrous cultural heritage, dechlorination processes of archaeological iron artefacts are studied in subcritical conditions which consist of immerging an artefact inside an alkaline bath under pressure (30 bar) and temperature (160 °C). Submarine archaeological environments lead to the presence of chlorides inside the corrosion layers. After exposure to the atmosphere following excavation, initial corrosion phases evolve. Chlorides remain trapped inside the structure of corrosion products particularly during the crystallisation of akaganeite. Stabilisation treatment objectives are to remove chlorides from the corrosion layers and to obtain more stable phases. A Roman archaeological bar has been studied on cross-section before and after treatment in sub-critical conditions. Less stable phases, such as ferrihydrite and akaganeite, transformed into hematite. That was confirmed by the use of synthetic and pure phases treated in the same conditions. The presence of goethite before and after the treatment in the corrosion profile raises the question of its reactivity during dechlorination process. Akaganeite has been synthesised and compared to archaeological powder sampled on an artefact. The results highlight reactivity differences indicating that sub-critical transformation processes are not only dependent on the nature of phases but also on intrinsic physical characteristic

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Section: Discussionmentioning

confidence: 99%

“…The present results were obtained at 160 °C. The pressure, which is not a determinant parameter in these conditions, was set to 35 bars .…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Corrosion product transformations in alkaline baths under pressure and high temperature: The sub‐critical stabilisation of marine iron artefacts stored under atmospheric conditions

Bayle

Viviés²,

Memet³

et al. 2015

Materials & Corrosion

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Evaluation of Chloride Extraction Rates from Copper Compounds Under Subcritical Conditions

MacLeod,

Näsänen

2023

Studies in Conservation

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Conservation of iron archaeological objects

Buravlev¹,

Цыбульская²,

Tsybulskaya

et al. 2019

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The monograph presents information on the conservation of iron archaeological objects by water alkaline treatment under normal and subcritical temperatures and pressures. Data on physical and chemical bases of destruction of iron archaeological objects at various stages of their existence are also generalized. For specialists in the field of archeology, chemical technology, graduate students, undergraduates engaged in research, restoration and preservation of archaeological objects.

show abstract

The use of subcritical fluids for the stabilisation of archaeological iron: an overview

Cited by 3 publications

References 15 publications

Corrosion product transformations in alkaline baths under pressure and high temperature: The sub‐critical stabilisation of marine iron artefacts stored under atmospheric conditions

Corrosion product transformations in alkaline baths under pressure and high temperature: The sub‐critical stabilisation of marine iron artefacts stored under atmospheric conditions

Evaluation of Chloride Extraction Rates from Copper Compounds Under Subcritical Conditions

Conservation of iron archaeological objects

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