EIS study on degradation of polymer-coated steel under ultraviolet radiation

被引：39
作者：
Hattori, Masanori [1 ]
Nishikata, Atsushi [2 ]
Tsuru, Tooru [2 ]
机构：
[1] Chau Elect Power Co Inc, Energy Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 4598522, Japan
[2] Tokyo Inst Technol, Grad Sch Sci & Engn, Meguro Ku, Tokyo 152, Japan
来源：
CORROSION SCIENCE | 2010年 / 52卷 / 06期
关键词：
Steel; Organic coating; EIS; IR spectroscopy; SEM; Polymer coating; COATINGS; UV;
D O I：
10.1016/j.corsci.2010.01.038
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Degradation of heavy-duty steel coatings when exposed to ultraviolet (UV) radiation was investigated by electrochemical impedance spectroscopy (EIS) and additional techniques in order to clarify the feasibility of evaluation of the UV degradation by EIS. Two coatings were considered: polyester-urethane topcoat plus epoxy primer (PU/E) and epoxy topcoat plus epoxy primer (E/E). Each was applied to a steel substrate and exposed to cyclic wetting-drying under UV radiation. The PU/E coating developed topcoat cracks but did not delaminate from the substrate; capacitive behaviour was evident, and corrosion of the underlying steel was not observed. The E/E coating showed topcoat chalking and partial disappearance, exposing the primer, but corrosion of the underlying steel was not observed. The morphology and chemical changes were compared with the results of EIS. (C) 2010 Elsevier Ltd. All rights reserved.
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页码：2080 / 2087
页数：8
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