文章基本信息

标题：Evaluation of new Coatings for the Protection of Ornamental Cast Ironwork Exposed in Uncontrolled Environment
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作者：M.M. Rifai ; Z.A. Hamid ; S.M. Saleh 等
期刊名称：International Journal of Conservation Science
印刷版ISSN：2067-533X
电子版ISSN：2067-8223
出版年度：2015
卷号：6
期号：4
页码：611-624
出版社：Alexandru Ioan Cuza University of Iasi
摘要：Ironworks constitute a great part of the world cultural heritage of metallic objects. Amongst these only a small part are on display in controlled environments. The rest is often exposed to uncontrolled atmospheres, high humidity and fluctuating temperatures and are usually heavily corroded. The aim of this study is to evaluate the efficiency of organic coating materials and corrosion inhibitors to protect ornamental cast ironwork from corrosion in uncontrolled environment using electrochemical techniques (Potentiodynamic polarization Tafel lines and electrochemical impedance (EIS)) and one year of exposure inside the clock tower of Muhammed Ali’s mosque in Salah El-Din Citadel in Cairo (natural ageing). Grey cast iron coupons were prepared to simulate the composition and morphology of the historic cast iron staircase, and treated with different protection systems. Four organic coatings have been studied; a methyl acrylate / ethyl methacrylate copolymer resin (Paraloid™ B-72) dissolved in acetone, an ethylene copolymer wax (Poligen® CE 9), Permalac (N-Butyl acetate-14.0) and Permalac EF (N-Butyl acetate-14.0). The last two have not been commonly used in conservation and restoration treatments. Two corrosion inhibitors have been studied; tannic acid and tannic acid mixed with phosphoric acid. The results indicated that the best protection of cast iron coupons was afforded by Permalac, which protects cast iron from corrosion and the effect of UV. Finally, Permalac was applied on the staircase inside the clock tower of Muhammed Ali’s mosque.
关键词：Ornamental Cast Ironworks; Corrosion; Conservation; Protection