Aluminum surface treatment technology should be divided into advantages and disadvantages

[China Aluminum Network] Artificial surface treatment - aluminum oxidation processing can not only increase corrosion resistance, but also increased decorative. Aluminum and its alloy surface easily generate a very thin oxide film (thickness of about 40 ~ 9A) in the atmosphere, so that it has a certain degree of corrosion resistance. However, because the bismuth layer is porous and non-uniform, it cannot be used as a reliable protective film layer, and the bismuth layer is amorphous, so that aluminum and its alloys lose their original luster and cannot be used as a satisfactory decorative film layer.

Anodized aluminum and its alloys, compared with the chemical oxidation performance is more superior, can usually be used as the end of anti-corrosion, decorative use or as a coloring, dyeing electrophoretic coating based. Anodizing can be divided into sulfuric acid method, chromic acid method, oxalic acid method, mixed acid method, hard and porcelain anodization and other methods based on the type of electrolyte solution and film layer properties.

1. Chemical Oxidation Treatment The chemical oxidation film obtained by the chemical oxidation treatment is porous, has a high chemical activity, and can be subjected to various coloring treatments, and then it is subjected to sealing treatment later. However, due to the thickness only between o.5-4 non-vertical μm, there are few adsorptive colorants, it is difficult to obtain bright colors, and the corrosion resistance is poor, but it can be used as the bottom layer of paint and enamel, and the interior decoration and structure are complex. Aluminum surface treatment process for small parts with low surface treatment requirements.

2. Electrochemical oxidation polishing: It can be divided into chemical polishing, electrochemical polishing and mechanical polishing. In recent years, the diacid polishing process has been developed to overcome the shortcomings of the traditional tri-acid polishing process in chemical polishing, which generates a large amount of yellow smoke and seriously pollutes the working environment. At the same time, it also reduces the working thermometer and cost, and the effect is not inferior to tri-acid polishing.