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Analysis of machining principle of aluminum hard oxidation surface

Article source: Editor in charge of the website: Author: popularity: - Time of publication: 09:30:00, 2015-09-04

At present, among our guests in Dongguan, we mainly need to carry out hard oxidation treatment of aluminum products. We have described the principle of anodic oxidation process (Introduction: anodic oxidation principle: http://huaminmed.com/article/yangjiyanghuadeyuanl)_ 1.html)。 So, what is the principle of hard oxidation treatment of aluminum products, Haisheng hardware To share with you, the company has 3 technicians above junior college and 1 technical expert with senior title, Haisheng hardware It has advanced oxidation technology and a number of domestic first-class oxidation equipment and testing instruments. It can be used for hard oxidation of various aluminum alloy materials including die casting aluminum alloy.

The company has been processing all kinds of high-grade hard anode products for many well-known domestic manufacturers. Such as high-end mobile phone, aluminum alloy shell Earphone shell All kinds of cylinder, car decoration, radiator, medical equipment, furniture accessories, mechanical parts, optical equipment and various hardware accessories. The film thickness and hardness of all aluminum products can reach more than 40um and 400hv respectively. At present, the longest product can be dyed for 0 ~ 7 meters; the natural color is 0 ~ 8 meters. Most of the customers' products are aluminum parts processing.

Anodizing of aluminum

In acid electrolyte, the material protection technology of producing oxide film on aluminum surface by electrolysis with aluminum as hard material. There are many kinds of electrolytes for hard oxidation of aluminum, but they are basically made up of sulfuric acid, chromic acid, oxalic acid or boric acid. The most commonly used one is sulfuric acid. The power supply can be DC, AC or AC DC. The voltage is between 5 and 25 V, and the temperature is lower than 25 ℃.

In the process of electrolysis, the anion of oxygen reacts with aluminum to form oxide film. This kind of film is not fine enough at the beginning of its formation and has a certain resistance, so that the negative oxygen ions in the electrolyte can still reach the aluminum surface and continue to form an oxide film. With the increase of the film thickness, the resistance increases and the electrolysis current decreases, while the outer oxide film contacting with the electrolyte dissolves at the same time. When the rate of oxide formation on the surface of aluminum is gradually balanced with the rate of chemical dissolution, the oxide film can reach the maximum thickness under this electrolytic parameter. The structure of the hard oxide film on aluminum is different from other conversion coatings. The dense layer of 0.01-0.1 μ m is close to the base metal, and the honeycomb layer composed of many hollow hexagonal cylinders is above it, with the total thickness of 2-100 μ M. Some of the electrolytes can be used to hydrolyze the electrolyte to form a hollow dye and some can be used to increase the beauty of the pigment.

Finally, it needs to be sealed and dried. The corrosion resistance of aluminum materials with hard alumina film is sometimes better than that of aluminum materials treated with chromate. In addition to being widely used in construction industry and daily hardware products, this kind of aluminum is also used in aircraft, automobiles and civil ships. The hard oxide film used in engineering can be formed by using electrolyte with low temperature, weak solubility and high voltage (100-150 V), which is used for mechanical parts and hydraulic components in contact with fiber, paper and rubber. When polytetrafluoroethylene (PTFE) is filled in the hexagonal cylinder cavity of ordinary hard alumina layer, the parts with very low friction coefficient can be obtained.

Haisheng hardware Adhering to the service tenet of "always think more for customers" and always "think a little more than customers", adhering to the business philosophy of "unremitting and serving the public", we are dedicated to provide more hard oxidation processing of supporting products for customers, and hope to create a new world of industry with you, strive to create a brand, and truly become a customer satisfied enterprise.

Related labels: hard oxidation, hard anodizing, anodizing

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