Investigation of the Influence of Air Environment on Lead Corrosion

IR

Bibliographic Information

Other Title
  • 〔報告〕鉛金属の腐食と空気環境との関係についての調査事例

Description

Recently, corrosion of lead composing art works has increasingly been reported. It is well known that lead is easy to be corroded if concentration of organic acid, such as acetic acid and formic acid, is high in surrounding air. Origin of such chemical substances is considered to be, for example, wood, wood-based material and adhesives used in exhibition rooms and storages of museums. The authors had an opportunity to conduct investigations in a museum where corrosion of lead composing an art work was observed. In this study, the corrosion product was identified and the air quality in storages was analyzed. From the result of analysis of air quality, it was found that the concentration of formic acid and formaldehyde is very high. Formic acid is produced by oxidation of formaldehyde; this might be one of the main reasons for high concentration of formic acid in the storage as well as emission from building components. As a result of X-ray diffraction analysis, corrosion products were identified as hydrocerussite and plumbonacrite, which are lead compounds exhibiting white. Taking into account the air quality, it is considered that high concentration of organic acid and formaldehyde might be the main factor of producing white materials on the surface of lead.

Journal

  • Science for Conservation

    Science for Conservation (60), 33-40, 2021-03-22

    独立行政法人国立文化財機構 東京文化財研究所

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