热处理方法对2A12铝合金阳极氧化热控膜结构与性能的影响

Effect of heat treatment on structure and properties of anodized thermal control coating on 2Al2 aluminum alloy

通过扫描电镜和能谱仪考察了热处理状态(T4和H112)对2Al2铝合金发黑阳极氧化热控膜微观形貌、元素组成和热循环性能的影响。结果表明,T4状态的铝合金上所得热控膜呈龟裂状,与基材之间存在孔洞。裂纹贯穿孔洞,这是造成热循环试验后热控膜脱落的主要原因。而H112状态的铝合金上所得热控膜较为致密,不存在孔洞,耐热循环性能较好。

The effects of T4 and H112 heat treatments on micromorphology,elemental composition,and thermal cycle resistance of blackened anodized thermal control coating on 2Al2 aluminum alloy were evaluated by scanning electron microscopy and energy-dispersive spectrometry.The results showed that the thermal control coating prepared on aluminum alloy with T4 heat treatment had“mud cracks”on its surface and cavities at the coating-to-substrate interface.The cracks runs through cavities,resulting in the exfoliation of the thermal control coating during thermal cycling test.The thermal control coating prepared on aluminum alloy with H112 heat treatment was compact,cavity-free,and resistant to thermal cycling.