高强度铝合金微等离子体电解氧化陶瓷质膜层影响因素

微等离子体电解氧化是在阳极氧化基础上发展起来的直接在轻合金表面原位生成γ-Al2 O3和α-Al2 O3陶瓷质膜的一项表面工程新技术.α-Al2 O3对陶瓷质膜层的性能起决定性作用,最大限度地促进α-Al2 O3的形成,是改善铝合金表面综合性能的关键.经过对国内近20个单位的调研,发现该技术在军工、航空、航天、机械等领域有着迫切的需求和广泛的应用前景,有望部分替代硬质氧化膜实现大规模生产.本文从基体材料、溶液特性及电参数三方面分析铝合金微等离子体氧化膜层的影响因素,重点分析基体合金元素对陶瓷质膜层的影响.指出该技术在高强度铝合金应用领域的发展方向并对其前景进行了展望.

Influence of PEO factors on ceramic coating of aluminum alloy surface

The technology of micro-arc-plasma electrolytic-oxidation has been used to produce γ-Al2O3 and α-Al2O3 ceramic coatings on light alloy surface in situ directly.This technology is developed on the base of anodic oxidation.The performance of ceramic coating is determined decisively by α-Al2O3 coating.Therefore,to promote the formation of α-Al2O3 coating extremely is the key process for improving the comprehensive properties of the aluminum surface.The surveying of nearly 20 domestic companies made things clear that the technology is demanded urgently and it possesses a broad application prospect in military,aviation,aerospace,mechanical fields.It is expected to partly replace hard anode oxidation and realize large-scale production.The influence of matrix material,electrolyte character and electricity parameters on micro-arc plasma oxidation coatings has been analyzed.The influence of matrix alloy elements on forming ceramic coatings has been investigated with emphasis.The development trend and prospects of this coating technology have been discussed.