铝合金表面涂覆纳米氧化铈掺杂氧化硅及其耐腐蚀性研究

Research on the surface coating of aluminum alloy with nano-cerium oxide doped silicon oxide and its corrosion resistance

铝合金以其密度小、耐腐蚀性及力学性能优越而被广泛关注,特别是航海领域,但是铝合金化学性质活泼、表面氧化层易于破损,使得其易于被海水腐蚀限制了铝合金在航海中的应用。纳米氧化铈具有很好抗海水腐蚀和抗微生物腐蚀作用,但纳米颗粒也存在直接涂覆难的问题。掺杂氧化硅的纳米复合氧化膜便于涂覆且具有更好的耐腐蚀性能,复合膜层可以有效抑制膜层基体降解剥落。本文对不同热处理温度和不同掺杂比例的氧化铈和氧化硅对铝合金表面耐腐蚀性的影响进行研究,得到耐腐蚀性能最好的热处理温度和掺杂比。

Aluminum Alloy with its low density,corrosion resistance and excellent mechanical properties and has been widely concerned,especially in the field of navigation,but Aluminum Alloy active chemical properties,surface oxidation layer is easy to be damaged,makes it easy to be applied to seawater corrosion limits of Aluminum Alloy in navigation. Nano-cerium oxide has very good resistance against seawater corrosion and anti microbial corrosion,but it also has the problem of direct coating. The nanocomposite oxide film doped with silicon oxide is easy to be coated and has better corrosion resistance,and the composite film can effectively inhibit the degradation and peeling off of the film substrate. In this paper,the effects of different heat treatment temperatures and different doping ratios of cerium oxide and silicon oxide on the corrosion resistance of aluminum alloy were studied.