镁合金表面热扩渗金属防护层的制备与性能

Fabrication and Properties of Protective Metal Coatings Obtained by Surface Thermal Diffusion on Magnesium Alloys

镁合金是一种轻质结构材料,将镁合金应用在交通工具中,可以降低其整体质量和能源消耗,同时提升其机动性能和续航能力。然而,镁合金易腐蚀,需强化其耐蚀性。表面扩渗法是一种常见的镁合金表面强化方法。在一定温度下,扩渗剂中的金属元素向镁合金表面传输,并形成一层防护层。首先介绍了几种常见的镁合金表面扩渗法,继而介绍了镁合金表面热扩渗的主要影响因素,然后介绍了采用这种方法制备的扩渗层的性能。在镁合金表面热扩渗形成的典型扩渗层厚度可达数百微米,同时扩渗层硬度和耐蚀性相对基体有明显提升。表面热扩渗可对镁合金进行有效的表面强化。

Magnesium alloy is a light-weight structural material.Applying this material in vehicles can reduce the vehicles’overall mass and energy consumption and improve their mobility and endurance.However,magnesium alloys are prone to corrosion,and their corrosion resistance needs to be enhanced.The surface diffusion method is a common surface strengthening method for magnesium alloys,in which the metal elements in the diffusion agent are transported to the surface of the magnesium alloy at a certain temperature and finally form a protective layer.Firstly,several common methods of surface diffusion on magnesium alloys were introduced in this paper.Secondly,the main influencing factors of thermal diffusion on the surface of magnesium alloys were summarized.Finally,the performance of the diffusion layer prepared by this method was introduced.The thickness of a typical diffusion layer formed by thermal diffusion on the surface of magnesium alloy could reach hundreds of microns,and the hardness and corrosion resistance of the diffusion layer were significantly improved compared with those of the substrate.Overall,surface thermal diffustion could effectively strengthen the surface of magnesium alloys.