| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive heat radiating black steel sheet having excellent heat radiation and design. SOLUTION: A darkened galvanizing layer is formed on a steel sheet, so as to be a dark plated steel sheet. A zinc phosphate-based chemical conversion film is formed on the dark plated steel sheet, so as to further strengthen the degree of the blackness, and thereafter, a thin black film is applied thereto, so as to be a black steel sheet. COPYRIGHT: (C)2007,JPO&INPIT
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