Study on the Method of Predicting Service Life of Coated Steel Sheets [II]

Predicting the Service Life of Silicone Polyester Resin Coated Galvanized Steel Sheet

Abstract

The authors are studying a method of predicting the service life of coated steel sheet by a test as short period as possible. The prediction of the service life of steel sheet coated with polyester resin paint by the method under study by the authors was already reported in Report [I]. The present report deals with the possibility of application of the method under consideration on the service life prediction of steel sheet coated with silicone polyester resin paint of different resin group as used for exterior building materials.
The result of our study shows that the service life prediction according our method is also applicable to the silicone polyester resin coated galvanized steel sheet. Also, it was found that the silicone polyester resin coated galvanized steel sheet is superior to polyester resin coated galvanized steel sheet in wear resistance and corrosion resistance in that the former is smaller in the change of such physical properties as hardness and water absorption rate of the coated film rather than in the appearance change such as decrease in gloss and change in color.