Die casting aluminum often appear die casting aluminum black oxidation, die-casting aluminum color oxidation and so on, today talk about die casting aluminum oxidation processing method
People often ask why the artificial surface treatment must be done - aluminum oxidation process? The surface of aluminum and its alloy is easy to produce a very thin oxide film (about 40~9A in thickness) in the atmosphere, which makes it have a certain anti-corrosion ability. But because the iodine layer porosity and uneven, because cannot be used as a reliable protective film, and the iodine layer is amorphous, the Aluminum Alloy lost the original luster, so that it can not satisfied to use as decorative, so using this method not only can increase the corrosion resistance, but also increase the decorative.
1. Chemical oxidation treatment
The chemical oxidation film obtained by chemical treatment is porous and has high chemical activity. It can be treated with various coloring methods and treated with the final sealing. But due to iodine only between 0.5-4 and non thick m, adsorption of colorants less difficult to obtain bright colors, and the corrosion resistance is poor, but can be used as bottom paint, enamel, small parts of aluminum surface treatment process of interior decoration and complex structure, surface blowing requirements is not high.
2. Electrochemical oxidation
Polishing: it can be divided into chemical polishing, electrochemical polishing machine and mechanical polishing. In the traditional acid chemical polishing polishing process due to produce large amounts of tobacco and serious pollution of working environment, so this year to develop acid polishing process, not only to overcome the above disadvantages, and also reduces the working thermometer and cost effect is not inferior to the polishing.
Anodic oxidation of aluminum and its alloys is superior to chemical oxidation, and can be used as final anticorrosive, decorative or as the basis of coloring, dyeing and electrophoretic coating. The anode curing can be divided into sulfuric acid method, chromic acid method, oxalic acid method, mixed acid method, hard and porcelain anode oxidation method according to the type of electrolyte liquid and the properties of the film
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