SURFACE-TREATED METALLIC MATERIAL, METHOD OF SURFACE TREATING THEREFOR AND RESIN-COATED METALLIC MATERIAL, METAL CAN AND CAN LID
申请人:TOYO SEIKAN KAISHA, LTD.
公开号:EP1566467A1
公开(公告)日:2005-08-24
A surface-treated metal material is obtained by forming an inorganic surface-treating layer containing at least Zr, O and F as chief components but without containing phosphoric acid ions on the surfaces of a metal by the cathodic electrolysis or by forming an inorganic surface-treating layer containing at least Zr, O and F as chief components and having an atomic ratio of P and Zr of 0 ≦ P/Zr < 0.6 in the uppermost surface on the surfaces of the metal by the cathodic electrolysis at a low cost featuring high productivity, environmental friendliness, scar resistance, adhesion, workability and intimate fitting. By using a metal material obtained by coating the surface-treated metal material with an organic resin and, particularly, with a polyester resin, a metal can or a can lid exhibits excellent adhesion and corrosion resistance even at portions that are worked to a high degree. Further, the can lid exhibits excellent opening performance even after the sterilization by heating.
通过阴极电解法在金属表面形成至少以 Zr、O 和 F 为主要成分但不含磷酸离子的无机表面处理层,或通过阴极电解法在金属表面最上层形成至少以 Zr、O 和 F 为主要成分且 P 和 Zr 的原子比为 0 ≦ P/Zr < 0.6 的阴极电解法在金属表面最上层形成的表面层,具有生产率高、环境友好、抗结疤、附着力强、可加工性好和紧密配合等特点,且成本低廉。通过使用在表面处理过的金属材料上涂覆有机树脂,特别是聚酯树脂而获得的金属材料,金属罐或罐盖即使在加工程度较高的部分也能表现出优异的附着力和耐腐蚀性。此外,即使在加热灭菌后,罐盖也能表现出优异的开启性能。