| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating structure having sufficient corrosion resistance and capable of suppressing the production cost without requiring an anodically oxidized film and sealing treatment. SOLUTION: A metallic material (an aluminum alloy) 21 is coated with a chemical film (zirconium phosphate) 22, this chemical film (zirconium phosphate) 22 is coated with a primer layer (phosphomolybdic acid) 23, and this primer layer (phosphomolybdic acid) 23 is coated with a finish coat layer (acryl or melamine) 24. Since zirconium phosphate is reacted with the oxidized film on the surface of the aluminum alloy, forms a zirconium boehmite layer and exhibits the action of increasing the adhesion and adhesive properties with a coating material, a corrosion resistant structure can be obtd. as the production cost is suppressed without requiring sealing treatment. Moreover, since phosphomolybdic acid and zirconium phosphate are adopted, the cost for waste soln. treatment is not run up, and the production cost can be suppressed. |
