Effect of Surface Treatment on Bonding Strength of Aluminum-Magnesium Hot-Rolled Composite Plate

表面处理方式对铝镁热轧复合板结合强度的影响

The effect of different surface treatments on the bonding strength of composite plates was investigated under the conditions of 400°C and reduction ratio of 45%.Results show that the wire brush grinding treatment can only eliminate the oxide film on the plate surface,but it can hardly produce a hard layer on the plate surface.The bonding effect depends on the element diffusion promoted by the close contact between the metals on both sides of the interface.After anodic oxidation,there is a hard layer on the metal surface,and the hard layer broken during the rolling process forms a mechanical occlusion at the bonding interface.However,the hard layer cannot form an effective combination with the metal at the interface,and the bonding can only occur in the fresh metal bonding area at the crack of the hard layer.The acid-alkali washing treatment can completely remove the hard layer on the surface of both alloys without increasing the surface roughness of the plate,and the metal on both sides of the interface is more closely bonded during the rolling process.The optimal bonding strength can be obtained by surface treatment of acid-alkali washing for the aluminum-magnesium hot-rolled bonding.

在400℃和45%轧制压下率条件下,研究了不同表面处理方式对复合板结合强度的影响。结果表明,钢丝刷打磨处理只能消除板材表面的氧化膜,很难在板材表面产生硬质层,复合效果取决于界面两侧金属紧密接触产生的元素扩散。阳极氧化后,金属表面会有一层硬质层,轧制过程中破碎的硬质层会在结合界面形成机械咬合。但是,硬质层无法与界面处的金属形成有效结合,只能在硬质层裂缝处的新鲜金属结合区发生结合。酸碱洗处理可以完全去除2种合金表面的硬质层,且不会增加板材的表面粗糙度,界面两侧的金属在轧制过程中结合更紧密。采用酸碱洗作为铝镁热轧结合的表面处理方法,可以获得最佳的结合强度。