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Experimental Study of Removing Epoxy Resin from Iron Object using Nd:YAG Laser Cleaning System  

Lee, Hye-Youn (Department of Cultural Heritage Conservation Science, Kongju National University)
Cho, Nam-Chul (Department of Cultural Heritage Conservation Science, Kongju National University)
Lee, Jong-Myoung (Laser Engineering Group, IMT Co. Ltd.)
Yu, Jae-Eun (National Research Institute of Cultural Heritage)
Publication Information
Journal of Conservation Science / v.27, no.3, 2011 , pp. 301-312 More about this Journal
Abstract
Epoxy resin has superior durability and adhesive strength and proper physical strength so that it is used to diversity materials for multi-purposes. However epoxy resin is hardly removed after hardening specially once it is applied to artefacts, it is difficult to remove them under re-conservation. This paper is an experimental study on removing epoxy resin applied to iron objects using Nd:YAG laser cleaning system. Tests conducted in this study investigated how increasing laser energy and pulses would give effect on samples. The samples were prepared in a way that epoxy resin, itself pure and one which was mixed with pigment and they were applied to iron coupons and corroded iron coupons respectively. As a result of experiment, pure epoxy resin applied to corroded iron coupons was ablated at high laser energy but epoxy resin applied to iron coupons and mixing with pigment were not ablated but discolored and bubbled due to laser-induced heat generation. Results of FT-IR showed no component alteration of shifted resins and no residues on the surfaces ablated by laser irradiation. From SEM-EDS for removed surfaces, the debris from epoxy resin and melting iron was observed. Therefore, this study demonstrated the possibilities and limitations for laser cleaning to remove epoxy resin from iron objects.
Keywords
Laser cleaning; Epoxy resin; Nd:YAG Laser; Cleaning;
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