Environment-friendly composite coating layer capable of improving adhesive force and preparation method of environment-friendly composite coating layer

The invention discloses a preparation method of an environment-friendly composite coating layer capable of improving adhesive force, which comprises the following steps: introducing a nano inorganic compound in the electroplating process of a workpiece to prepare a composite electroplated layer, then carrying out grafting modification treatment on the nano inorganic compound, and spraying a functional coating, the surface of the grafted and modified nano inorganic compound contains an organic short chain, so that the adhesive force between a base material of a workpiece and a top coating in a subsequent process is improved, and the functional coating is used for a longer time. The surface structure of the workpiece is not damaged, the process controllability is high, and the method is suitable for actual production and application. 本发明公开了一种提高附着力的环保复合涂镀层的制备方法，是在对工件进行电镀过程中引入纳米无机化合物制备复合电镀层，然后对纳米无机化合物进行接枝改性处理后喷涂功能涂层，接枝改性后的纳米无机化合物表面含有有机短链，提升了工件的基材与后道工序顶层涂层的附着力，使功能涂层的使用更持久。本发明不损坏工件表面结构，工艺可控性强，适于实际生产应用。