| 摘要 |
PROBLEM TO BE SOLVED: To provide a coated metal plate for exterior application, which is chromate-free and yet has excellent corrosion resistance in a flat part.SOLUTION: A coated metal plate according to this invention is a chromate-free coated metal plate for exterior applications, which comprises a metal plate, and a coating film that is arranged on the metal plate. The coating film contains 0.2-15% by volume of porous particles as a gloss control agent and further contains 0.2-15% by volume of primary particles as a delustering agent. If R1 (μm) is the number average particle diameter of the gloss control agent, R2 (μm) is the number average particle diameter of the delustering agent, T (μm) is the film thickness of the coating film, &sgr;1 (μm) is the standard deviation of the number-based particle size distribution of the gloss control agent, and &sgr;2 (μm) is the standard deviation of the number-based particle size distribution of the delustering agent, the coated metal plate satisfies the following formula:(R1+2&sgr;1)/T≤0.7; R1≥2.0; 2.0≤(R2+2&sgr;2/)T≤7.0; 13≤T≤20. |
