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"Understand together" medical device surface treatment aluminum oxidation is what process?

Times:2021.05.11 Author: Tianda Aluminum

Many people are not very clear about "aluminum oxidation" refers to the specific process, we do a simple introduction to this issue for you:

Aluminum oxidation: aluminum or aluminum alloy products as the anode, placed in the electrolyte solution for power treatment, the use of electrolytic effect to form aluminum oxide film on the surface of the process, known as aluminum and aluminum alloy anodizing treatment. After anodizing treatment, the surface of aluminum can generate several microns - hundreds of microns of oxide film. Compared with the natural oxide film of aluminum alloy, its corrosion resistance, wear resistance and decoration have been significantly improved and enhanced.

The principle of aluminum anodizing is essentially the principle of water electrolysis. When an electric current passes through, the following reaction will occur: on the cathode, H2 is emitted in the following reaction: 2H++2e→H2 on the anode, 4OH-4e→2H2O+O2, the oxygen precipitated is not only molecular oxygen (O2), but also atomic oxygen (O), and ionic oxygen (O-2), which is usually expressed as molecular oxygen in the reaction. The aluminum as the anode is oxidized by the oxygen precipitated on it to form an anhydrous Al2O3 film: 2AI+3[O]=AI2O3+1675.7KJ It should be pointed out that the generated oxygen is not all the action with aluminum, and some of it is precipitated in the form of a gaseous state.

Types of anodizing Anodizing has long been widely used in industry. There are many ways to title different names, and there are the following classification methods:

According to the current type, it can be divided into: direct current anodizing, alternating current anodizing, and pulse current anodizing which can shorten the production time to reach the required thickness, and the film is thick and uniform and dense, and the corrosion resistance is significantly improved;

According to the electrolyte: sulfuric acid, oxalic acid, chromic acid, mixed acid and organic sulfonic acid solution natural color anodizing;

According to the properties of the film, there are: ordinary film, hard film (thick film), porcelain film, bright modification layer, semiconductor barrier layer and other anodic oxidation;

The application of direct current sulfuric acid anodizing is common, because it is suitable for the anodizing treatment of aluminum and most aluminum alloys; The film layer is thick, hard and wear-resistant, and better corrosion resistance can be obtained after sealing. The film layer is colorless and transparent, strong adsorption ability and easy to stain; Low processing voltage, less power consumption;

The process does not need to change the voltage cycle, which is conducive to continuous production and practical operation automation; Sulfuric acid is less harmful to the human body than chromic acid, wide supply, low price advantages.

In the past ten years, China's construction industry has gradually used aluminum doors and Windows and other decorative aluminum materials, and their surface treatment production lines are using this method.

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  • Titanium Alloy Business

    Contact: Mr. Li

    Phone: +86 18651956020


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    Phone: +86 15351994672


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