镁合金作为新型材料,具有其他金属材料无法比拟的优点。镁合金主要由镁元素构成,由于镁元素相对比较活泼和镁合金表面有大量缝隙导致其易被环境腐蚀,因此在化学氧化成膜的基础上研制了一套封闭清漆、防护底漆。其中封闭清漆和防护底漆树脂都选用了改性环氧树脂和复合聚酰胺固化剂,防护底漆颜填料选用了钝化颜料锌铬黄和屏蔽填料云母粉、石墨烯等,使得镁合金基材喷涂涂层之后的耐中性盐雾和耐湿热性达到了1500 h,完全能够满足我们使用镁合金基材所需的防腐要求。

As a new material,magnesium alloy has the advantage that other metal materials cannot be compared.The magnesium alloy is mainly composed of magnesium.Because magnesium is relatively active and there are a lot of gaps on the surface of magnesium alloy,it is easy to be corroded by the environment.Therefore,a set of closed varnish and protective primer have been developed on the basis of chemical oxidation film formation.The resin for sealing varnish and protective primer is made of modified epoxy resin and composite polyamide curing agent.The pigment and filler of the protective primer is made of passivation pigment zinc chrome yellow and shielding filler mica powder,graphene,etc.,so that the magnesium alloy substrate can be sprayed with a coating to resist neutral salt spray and heat and humidity up to 1500 h.It is fully capable of achieving the corrosion protection required for our use of magnesium alloy substrate.