电力设备用Al-Mg-Si合金表面超疏水复合膜的制备与性能研究

Preparation and Properties of Superhydrophobic Composite Coating on Surface of Al-Mg-Si Alloy for Power Equipment

以电力设备用Al-Mg-Si合金作基体,采用阳极氧化工艺并结合溶胶-凝胶法在Al-Mg-Si合金表面制备出超疏水复合膜。采用扫描电镜、能谱仪和接触角测量仪对Al-Mg-Si合金及复合膜的微观形貌、成分和疏水性进行表征分析,并通过自然气候老化试验和加速腐蚀老化试验对复合膜的耐久性和耐蚀性进行测试分析。结果表明,复合膜表面存在微/纳米分级结构,完整地覆盖Al-Mg-Si合金,主要含有Al、O、S、Si和C五种元素,成分均匀性良好。复合膜表面水滴接触角达到151.8°,呈现超疏水性且能耐受较长时间的自然气候老化,稳定保持良好疏水作用。与AlMg-Si合金相比,复合膜的腐蚀电流密度降低超过一个数量级,并且加速腐蚀老化试验后腐蚀程度明显较轻,可以对Al-Mg-Si合金起到良好的腐蚀防护作用。

A superhydrophobic composite coating was prepared on the surface of Al-Mg-Si alloy for power equipment by anodizing process combined with sol-gel method.The microstructure,composition and hydrophobicity of Al-Mg-Si alloy and composite coating were characterized and analyzed by scanning electron microscope,energy dispersive spectrometer and contact angle measuring instrument,and the durability and corrosion resistance of composite coating were tested and analyzed by natural climate aging test and accelerated corrosion aging test.The results show that the composite coating mainly containing Al,O,S,Si and C elements and has a micro/nano grade structure,and it is completely covered on Al-Mg-Si alloy with good composition uniformity.The contact angle of water droplet on the surface of composite coating reaches 151.8°,indicating that the composite coating show superhydrophobicity and it can withstand natural climatic aging for a long time,and maintains a good hydrophobic effect stably.Compared with Al-Mg-Si alloy,the corrosion current density of the composite film is reduced by more than an order of magnitude,and the corrosion degree is significantly lighter after the accelerated corrosion aging test.The composite film can play a good role in corrosion protection for Al-Mg-Si alloy.