| 摘要 |
PROBLEM TO BE SOLVED: To provide a process-reduced method for preventing the corrosion of weather resisting steel by which rust preventability and weather resistance of steel can be maintained over a long period, optional coloring therefor is possible, and the number of stages can be reduced. SOLUTION: A coating film (A) of a base control agent containing (a) a moisture hardening type resin, (b) rust preventive pigment, (c) a corrosion ion fixing agent, and (d) a coupling agent is formed on the surface of weather resisting steel in which only floating rust is removed, and rust remains by a dry coating amount of 0.03 to 2 kg/m<2> . A corrosion preventive coating film (B) containing a rust preventive is formed thereon so as to control the dry film thickness to 30 to 60μm. Next, a colored top coating film (C) whose gloss holding ratio after 300 hr irradiation with an accelerated weathering test sunshine weather meter is >=85% is formed so as to control the dry film thickness to 20 to 40μm.
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