In the sulfuric acid solution of certain East Lake, the process of forming an anodized film on the surface of aluminum and its alloy by electrochemical action is called anodizing of sulfuric acid.
Compared with other anodizing processes, the sulfuric acid anodizing process has the advantages of simple process formula, stable solution composition, no need for frequent frequency adjustment, operation at normal temperature, and easy process control.
The film obtained by the sulfuric acid anodizing process is larger than 12μm, and has good corrosion, wear resistance, weather resistance and corrosion resistance. The film layer is long and empty, the adsorption is good, and various bright colors are increasingly applied, or a variety of colors are required for the function, so that the decoration is added.
Since the sulfuric acid anodizing of aluminum has the above advantages compared with other anodizing processes, it has become the main coating type of aluminum and its alloys in the surface coating process.
One thing that needs to be explained and paid attention to in the sulfuric acid anodizing process of aluminum is that the appearance of the anodized film obtained by various aluminum alloys is different. After the anodizing of pure aluminum anode, a colorless and highly transparent oxide film can be obtained, and the higher the purity of aluminum and the better the transparency, other than the magnesium in other aluminum alloys, other components, the appearance quality of the film layer will be obvious. Impact, its impact is as follows:
1 An aluminum alloy containing zinc makes the film opaque milky white;
2 Aluminum alloy containing copper will make the film dark gray;
3 Aluminum alloy containing silicon will make the film dark gray;
4 Containing technical impurities such as iron and manganese will also have a significant effect on the appearance of the film.
For this reason, a decorative-oriented part should have a choice of materials in the manufacturing process.