| 摘要 |
The coating film for this coated steel plate comprises a silicate and melamine. In this coating film, the Si content SiTS of the outermost layer, the Si content SiS of the surface layer, and the Si content SiB of the body layer simultaneously satisfy the relationships SiB < SiS < SiTS, 7.0 ≤ SiS ≤ 50 and 7.0 ≤ SiTS/SiB ≤ 50, and the N content NTS of the outermost layer, the N content NS of the surface layer and the N content NB of the body layer simultaneously satisfy the relationships NS < NTS, 30 ≤ NTS ≤ 50 and 1.0 < NTS/NB ≤ 3.0. The value of a local maximum of the depth profile curve of the N content of the coating film divided by the absolute maximum is at least 0.8 and less than 1.0. |
