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发明授权
CN101218313B 形成多层涂膜的方法 失效 - 权利终止

形成多层涂膜的方法
摘要：
本发明提供了一种形成多层涂膜的方法，该方法能合并在电沉积涂覆前对金属基底进行的预处理步骤，和电沉积涂覆步骤。该方法包括：将待涂覆的材料浸入含水涂料组合物的步骤，该含水涂料组合物包含(A)稀土金属化合物，(B)具有阳离子基团的基础树脂，和(C)固化剂，其中限定含水涂料组合物中稀土金属化合物(A)的含量在特定范围内；在含水涂料组合物中施加小于50V的电压的预处理步骤，其中待涂覆的材料用作阴极；和在含水涂料组合物中施加50-450V的电压的电沉积涂覆，其中待涂覆的材料用作阴极。
摘要（英）：

The present invention is to provide a method for forming a multi-layer coating film, which can combine a pre-treating step conducted for a metal substrate, before electrodeposition coating, and an electrodeposition coating step. The method comprises: a step of dipping a material to be coated in an aqueous coating composition comprising (A) a rare earth metal compound, (B) a base resin having a cationic group, and (C) a curing agent, wherein a content of the rare earth metal compound (A) in the aqueous coating composition is limited to specific range; a pre-treating step of applying a voltage of less than 50 V in the aqueous coating composition, wherein the material to be coated is used as a cathode; and an electrodeposition coating of applying a voltage of 50 to 450 V in the aqueous coating composition, wherein the material to be coated is used as a cathode.

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