Early stages of surface alteration of soda-rich-silicate glasses in the museum environment

Rodrigues, Alexandra; Fearn, Sarah; Palomar, Teresa; Vilarigues, Márcia

doi:10.1016/j.corsci.2018.08.012

Cited by 35 publications

(43 citation statements)

References 49 publications

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“…The K-rich, the Na-rich and the Na-Ca glasses also studied by the authors were exposed to similar conditions and present a higher degree of surface attack by atmospheric moisture. 31,32 Hence, following the empirical nature of the previously suggested structural and compositional dependences, 32 the greater limiting factor of the alkali release from these surfaces and the lower proneness of the structure to interact with water molecules seems to be the network topology itself. Once more-and considering the other compared glass compositions-it is important to mention that this is a multicomponent silicate system, where the different oxide content (ie the cations) contribution to the response of the lattice when in contact with air moisture is known to play a complex structural role.…”

Section: Discussionmentioning

confidence: 82%

“…All of these objects present a very good preservation state compared to others with compositions similar to the other produced replica material (Na-rich, Na-Ca-Si and K-rich glasses) and which surface alteration was already discussed elsewhere. 31,32 The latter were also aged under the same conditions and revealed a rather different (more pronounced alteration) behaviour. 31,32 Once more, this evidence supports the proposal made of the higher durability of the MA type studied, and contributes with long-term evidence to the good agreement with the models suggested as interpretative of the observed phenomena.…”

Section: Long-term Evidencementioning

confidence: 99%

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Mixed reactions: Glass durability and the mixed‐alkali effect

2019

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Multiple‐component oxide silicate glasses possess a complex network backbone, which results in manifolded composition property relationships. The relation between the chemical composition and durability of silicate glasses is not linear, however, this relation has always been considered somewhat relevant. Several contradicting observations on the mixed‐alkali effect and its relation with their chemical alteration have been reported. Here, laboratory results and historical evidence show that the often good state of preservation of aged mixed modifier glasses is in good agreement with the influence of a mixed‐modifier cation effect (MMCE) such as had been observed for other mobility‐ and bulk‐related properties. This concordance supports the proposals made through this work concerning pore closure and lower diffusivity of mobile species under the MMCE.

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Section: Discussionmentioning

confidence: 82%

Section: Long-term Evidencementioning

confidence: 99%

Mixed reactions: Glass durability and the mixed‐alkali effect

2019

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“…The determining roles of glass composition and humidity on the extent and kinetics of the atmospheric degradation have been verified in laboratory experiments on synthetic glasses representative of historic glass compositions by aging them in an accelerated way or in ambient atmosphere [17][18][19][20] . The main macroscopic manifestations are always the same, independently of the composition, and very specific 1,21,22 .…”

Section: Signs and Issues Of Glass Alteration In Humid Atmospherementioning

confidence: 99%

“…Various protocols have been used to control RH and temperature in glass alteration experiments: (i) desiccator with or without saline solutions 18,19,78 , (ii) climatic chamber 64,75,[79][80][81][82] , (iii) hermetic box enclosing a saline solution and placed in an oven 83 , (iv) teflonlined autoclave in an aluminum container (to homogenize T) 70,84 , with samples placed on a teflon holder above a saline solution, and placed in an oven. Humidity conditions can be unsaturated (less than 100% RH) or saturated (100% RH), although we focus on the unsaturated conditions in this paper.…”

Section: Mechanisms Of Glass Alteration In Humid Atmospherementioning

confidence: 99%

Glass alteration in atmospheric conditions: crossing perspectives from cultural heritage, glass industry, and nuclear waste management

et al. 2020

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While glass alteration in liquid water has been widely studied for decades, glass alteration in unsaturated atmosphere (relative humidity, RH < 100%) has been far less examined. However, the understanding of the mechanisms involved in the reactions between glass and water in vapor state is fundamental to several fields such as glass industry, conservation of glasses of the cultural heritage and long-term assessment of nuclear waste glasses. This paper outlines the issues raised by the atmospheric alteration of glass in these fields and attempts to summarize the scientific approaches and findings of the three communities. This short review reveals that atmospheric alteration should not be confused with liquid alteration at high S/V (S = exposed surface of glass and V = volume of solution), because the kinetics and the nature of the alteration products are distinct. Notably, alkalies and non-bridging oxygens may be significantly retained in glass hydrated in unsaturated atmosphere, depending on the glass composition. Future lines of research are drawn to progress in the understanding of the specificities of atmospheric glass alteration.

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“…Ancient glass and porcelain corrosion research mainly includes burial-site alteration of lead silicate glaze [7][8][9], burial-site weathering of lead silicate glass or lead-barium silicate glasses [10], atmospheric or aqueous decay of potassium silicate stained glass window [11][12][13], geochemical alteration of soda-lime silicate glasses [14], museum condition alteration of soda-rich-silicate and soda-lime silicate glasses [15]. The corrosion of glass and glaze is mostly studied in terms of the glassy phase.…”

Section: Introductionmentioning

confidence: 99%

New perspective on Jun glaze corrosion: study on the corrosion of light greenish blue and reddish purple glazes from Juntai Kiln, Yuzhou, Henan, China

Chen

et al. 2020

Herit Sci

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The ancient Chinese Jun Porcelain has of typical high fired calcium silicate glaze. After observation of Jun porcelain shards excavated from Juntai Kiln in Yuzhou, Henan Province, China, two pieces with light greenish blue glaze and reddish purple glaze are selected for study as special corrosion samples buried in soil environment. Taking the corrosion of each phase of the overall glaze into consideration, the chemistry compositional and morphological structural features of the earthworm-walking patterns and their surrounding white area (corroded zone) in the glazes are compared and studied with optical microscopy (OM), scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDS), Raman spectroscopy (Raman) and electron microprobe (EPMA): during the firing of Jun Porcelain, the dendritic and columnar crystals coming out of the glaze and mostly in surrounding corroded areas are identified as wollastonite (CaSiO 3 ), which provides active sites for localized corrosion. The wollastonite crystalline phases have preferential corrosion initiated by pitting corrosion relative to glassy phase, leaving dendritic or columnar pits and craters to dissolve into calcium ions and silicic acid and losing into the burial environment. Some calcium ions in the surface pits react with dissolved inorganic carbon (DIC) from the soil to form calcium carbonate (CaCO 3) precipitated on the surface of the glazes. The cracks formed during the cooling process and the interconnected craters caused by crystals dissolution can provide channels to facilitate the progression of the corrosion. This research is of great significance to the study of the corrosion mechanism of ancient porcelain and the conservation of its cultural relics. It has changed the traditional view that porcelain is corrosion-resistant. At the same time, the study of the corrosion process and characteristics of ancient porcelain can provide reference for modern ceramic research and corrosion protection.

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Early stages of surface alteration of soda-rich-silicate glasses in the museum environment

Cited by 35 publications

References 49 publications

Mixed reactions: Glass durability and the mixed‐alkali effect

Mixed reactions: Glass durability and the mixed‐alkali effect

Glass alteration in atmospheric conditions: crossing perspectives from cultural heritage, glass industry, and nuclear waste management

New perspective on Jun glaze corrosion: study on the corrosion of light greenish blue and reddish purple glazes from Juntai Kiln, Yuzhou, Henan, China

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