阳极氧化木纹着色工艺中多孔氧化膜的生长

The Growth of Porous Anodic Film in the Process of Anodizing and Grain Colouring

对阳极氧化木纹着色工艺中的关键环节——多孔阳极氧化膜的生长进行了探讨。发现凡经着色后能得到浓淡差异、色彩鲜明的表面,其结构是坟路内多孔膜厚于其外的区域。壁垒膜的存在对多孔膜的生长有一个延迟阻碍作用,壁垒膜越厚,多孔膜的生长受到的延迟阻碍作用越大。木纹电解结束后,铝合金表面有壁垒膜存在,纹路内壁垒膜薄,其外厚且均匀。

This paper deals with the growth of porous anodic film and the key link in the process of anodizing and grain colouring. It is discovered that the porous film on the grain lines is much thicker than other area with bright colour and obvious shade difference could be obtained after colouring. Existed barrier film hinders and postpones following growth of the porous film. The thicker the barrier film, the larger the hindering effect is. After electrolyzing, barrier film is formed on the surface of aluminum alloy. The thickness of the barrier film on the grain lines is thinner than other area where the barrier film is uniform. Such surface structure makes the thickness of porous film on grain lines thicker than the area outside them after following porous anodizing in dilute sulphuric acid bath.