矿化膜对环氧树脂/矿化膜复合涂层在Mg⁃3Nd合金表面附着力的影响

Effect of mineralized film on the adhesion of epoxy resin/mineralized film composite coatings on Mg⁃3Nd alloy surfaces

镁及其合金因为其低密度应用于诸多领域,但镁合金耐腐蚀性较差。环氧树脂作为一种优良的耐腐蚀涂层广泛应用于镁合金表面,但环氧树脂附着力有待提升。本文采用一种新的矿化方法,系统研究在Mg⁃3Nd合金表面添加环氧树脂/矿化膜复合涂层对力学性能的影响和环氧树脂/矿化膜复合涂层与单层的环氧树脂涂层在Mg⁃3Nd合金表面附着力的变化。研究结果表明:通过拉伸试验可以得知,Mg⁃3Nd合金与表面添加环氧树脂/矿化膜复合涂层的Mg⁃3Nd合金的力学性能强度差距不足1%;通过对涂覆环氧树脂/矿化膜复合涂层与单层的环氧树脂涂层的Mg⁃3Nd合金进行不同拉伸程度测试,可以发现环氧树脂/矿化膜复合涂层的附着力要大于单层环氧树脂涂层;在拉脱实验中环氧树脂/矿化膜复合涂层的抗拉脱性能是环氧树脂涂层的4.84倍,证明合金表面的环氧树脂/矿化膜复合涂层具有优异的附着力。

Magnesium and its alloys are widely used due to their low density,but they are prone to poor corrosion resistance.Epoxy resin is commonly employed as a corrosion⁃resistant coating for magnesium alloys.However,its adhesion properties often require improvement.In this study,a novel mineralization method was utilized to systematically investigate the effects of adding an epoxy resin/mineralized film composite coating to the surface of Mg⁃3Nd alloys.The research focused on comparing the mechanical properties and adhesion of the epoxy resin/mineralized film composite coating with those of a single⁃layer epoxy resin coating applied to Mg⁃3Nd alloys.The findings of the study are as follows:Tensile tests revealed that the strength difference between Mg⁃3Nd alloy and Mg⁃3Nd alloy coated with the epoxy resin/mineralized film composite is less than 1%.Testing under various tensile strength levels showed that the epoxy resin/mineralized film composite coatings exhibited superior adhesion compared to the single⁃layer epoxy resin coating.Pull⁃off tests demonstrated that the pull⁃off resistance of the epoxy resin/mineralized film composite coating was 4.84 times greater than that of the single⁃layer epoxy resin coating.These result confirm that the epoxy resin/mineralized film composite coating provides excellent adhesion to the alloy surface.