Environment-friendly chromium-zinc-aluminum-free coating liquid and preparation method thereof

The invention provides an environment-friendly chromium-zinc-aluminum-free coating liquid and a preparation method thereof. The environment-friendly chromium-zinc-aluminum-free coating liquid comprises the following components of: in parts by mass, 0.1-5 parts of a modified nano material, 10-30 parts of metal powder, 0.1-2 parts of a wetting agent, 1-5 parts of a dispersant, 0.1-1 part of a pH adjuster, 1.2-10.6 parts of other auxiliary agents and 30-100 parts of deionized water, wherein the modified nano material is prepared by treating a nano material with a silane coupling agent or a titanate coupling agent. On the basis of a water-based chromium-free Dacromet coating liquid, the problems of poor corrosion resistance, low hardness, insufficient wear resistance and the like of the water-based chromium-free Dacromet coating liquid are further solved by doping modified nano particles. 本发明提供种环保无铬锌铝涂液及其制备方法。种环保无铬锌铝涂液，以质量份数计，包括如下组分：改性纳米材料0.1～5份，金属粉末10～30份，润湿剂0.1～2份，分散剂1～5份，pH调节剂0.1～1份，其他助剂1.2～10.6份和去离子水30～100份，所