Changshu aluminum oxidation takes aluminum or aluminum alloy products as anodes, which are placed in electrolyte solution for power on treatment, and the process of forming alumina film on its surface by electrolysis is called aluminum and aluminum alloy anodizing. After anodizing, the aluminum surface can produce an oxide film of several microns - hundreds of microns. Compared with the natural oxide film of aluminum alloy, its corrosion resistance, wear resistance and decoration have been significantly improved.

The principle of Changshu aluminum oxidation is essentially the principle of water electrolysis. When the current passes, the following reactions will occur: on the cathode, H2 will be released according to the following reactions: 2h + + 2e → H2, on the anode, 4OH - 4E → 2H2O + O2. The precipitated oxygen is not only molecular oxygen (O2), but also atomic oxygen (o) and ionic oxygen (O-2). It is usually expressed as molecular oxygen in the reaction.

Aluminum as an anode is oxidized by the oxygen precipitated on it to form an anhydrous Al2O3 film: 2A1 + 3 [O] = A12O3 + 1675.7kj. It should be pointed out that not all the generated oxygen acts with aluminum, and part of it precipitates in gaseous form.

Changshu aluminum oxidation is a kind of anodizing, which has been widely used in industry for a long time. There are many methods with different names, which can be summarized into the following classification methods: according to the current type, there are DC anodizing, AC anodizing, and Pulse Current Anodizing which can shorten the production time to reach the required thickness, the film is thick, uniform and dense, and the corrosion resistance is significantly improved.

The application of direct current sulfuric acid anodizing is the most common because it is suitable for Anodizing of aluminum and most aluminum alloys; The film is thick, hard and wear-resistant, and better corrosion resistance can be obtained after sealing the hole; The film is colorless and transparent, with strong adsorption capacity and easy coloring; Low processing voltage and low power consumption; The treatment process does not need to change the voltage cycle, which is conducive to continuous production and practical operation automation; Sulfuric acid has the advantages of less harm to people than chromic acid, wide supply and low price.