| 摘要 |
PURPOSE:To form a tenacious and corrosion-resistant fluoroplastic coating, which strongly bonds to aluminum surface, by a method wherein the aluminum surface is discontinuously coated, baked and fused with enamel and, after that, coated and dried with fluoroplastic dispersion coating containing the specified amount of silica-based filler so as to develop the specified mean coating build-up and finally coated and baked with filler-containing fluoroplastic dispersion coating so as to develop the specified coating build-up. CONSTITUTION:When the formation of a fluoroplastic coating on an aluminum surface, which is roughened and, after that, onto which enamel made of borosilicate-based frit is applied and baked, is intended, the enamel is discontinuously applied to the aluminum surface so as to cover 20-60% of the aluminum surface and, after that, baked and fused to the surface. Next, fluoroplastic dispersion coating, which contains 25-50wt.% of silica-based filler with respect to fluoroplastic, is applied to the resultant aluminum surface and dried so as to develop a mean coating build-up of 3-7mum. Finally, filler-containing fluoroplastic dispersion coating is applied to the aluminum surface just mentioned above and baked so as to develop a coating build-up of at least 25mum. As a result, the bond strength of the fluoroplastic coating provided on the aluminum surface is improved, resulting in allowing to use the coating over a long period of time. |
