Degradation Phenomena of Wooden Pillars in the Main Hall of the Fengguo Monastery, Yixian, Liaoning, China - Scientific Investigation with XRD, IC, and FTIR Analysis -

Zhou, Yishan; Matsui, Toshiya; Liu, Cheng; Wang, Fei

doi:10.12654/jcs.2020.36.1.02

Cited by 1 publication

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“…The results of the authors' previous field investigation indicated the presence of significant Cu/Zn elements and fine particles identified as copper/zinc oxalate hydrate particles in the whitening wood (Figure 2) [3,4]. These findings suggest a new possible cause that may lead to the whitening discolouration of the wood, in addition to white-rot fungi [5], UV light and visible irradiation [6,7] and calcareous depositions from the contacted ground [3,8], which have been more profoundly studied. To verify the processes of how metal ions affect wood and ultimately result in the generation of metal oxalates, a model experiment was carried out by authors with wood powders of Sugi (Cryptomeria japonica) and Keyaki (Zelkova serrata), with different levels of the Cu(II)/Zn(II) ion content (percentage of dry weight: 0.00%, 0.05%, 0.50% and 2.50%), exposed to 60 °C and a relative humidity (RH) of 90% in a previous work.…”

Section: Figurementioning

confidence: 97%

Study of the Effects of Cu/Cu-Zn Alloy Components Adjacent to Wood in Historic Architecture: Surface Performance Changes by Artificial Wood Degradation

et al. 2022

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Here, we investigated the wood-whitening phenomenon adjacent to metal components that are commonly observed in Japanese historic architectures. The higher detection of Cu/Zn elements and fine particles of copper/zinc oxalate hydrate in whitened wood has been verified in a previous field investigation. In order to explore the related cause of this phenomenon, this study established model experiments to evaluate some surface performance changes of wood plate samples with impregnated Cu(II)/Zn(II) contents under artificial degradation. The evaluation included the following: (1) the state of metal oxalates in the wood tissue; (2) the mechanical performance of the resistance to the external forces; and (3) the colour change of the wood surface. As the result, the accumulation of metal oxalates and their growth in particle sizes were confirmed in samples containing metal, in particular those with a higher Cu(II) content, regardless of wood species. Meanwhile, this metal-involved degradation could introduce the risk of embrittlement of wood ahead of the occurrence of visible whitening discolouration.

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