Maituo has launched a series of magnesium alloy surface treatment products, featuring advanced technology and superior performance.
Release Time:
Dec 06,2016
Magnesium, as the lightest metal structural material on Earth, possesses many excellent characteristics.
1. Craft Background
Magnesium, as the lightest metal structural material on Earth, possesses many excellent characteristics. Magnesium has a high specific strength, with a density of about 2/3 that of aluminum and 1/4 that of iron; it also has good thermal and electrical conductivity, dimensional stability, electromagnetic shielding, machinability, and recyclability. These characteristics make it the preferred structural material in the automotive, aerospace, and electronics industries.
However, due to the highly reactive chemical nature of magnesium and its standard electrode potential being very negative (-2.36V), magnesium alloys have poor corrosion resistance and can easily suffer severe corrosion in corrosive media. Additionally, the surface film of magnesium alloys is loose and porous, providing poor protection for the substrate. This makes them unsuitable for most corrosive environments, and the relatively poor corrosion resistance of magnesium and its alloys limits their applications to some extent. Therefore, improving the corrosion resistance of magnesium and magnesium alloys is crucial.
Currently, there are several main methods to improve the corrosion resistance of magnesium and its alloys:
1. By reducing the content of 'harmful elements' such as iron, nickel, copper, and cobalt in magnesium alloys;
2. Adding rare earth elements to develop new magnesium alloy materials with corrosion resistance.
3. Applying surface coating treatments to magnesium alloys, using the barrier formed between the coating and the external environment to suppress and alleviate the corrosion of magnesium alloy materials.
Among these, the third method is the simplest and most effective way to prevent corrosion of magnesium and magnesium alloys. To ensure that the coating adheres well and has self-repairing capabilities, pretreatment must be performed before coating to ensure good adhesion between the coating and the substrate. The formation of a film is an important means of pretreatment before coating, which can enhance the adhesion of the surface coating treatment on magnesium alloys.
2. Product Introduction
Previously, the chemical treatment agents for magnesium alloys used chromate agents, which contained harmful substances and caused environmental issues. This product (Chromium-free Coating 810 Series for Magnesium Alloys) does not contain chromium, cyanide, or other harmful substances. It uses mature processes and raw materials, has a simple process flow, is easy to maintain, has low energy consumption, good stability, and a high product qualification rate, making it very suitable for industrial production lines. The magnesium alloys treated with this process can achieve excellent adhesion as a coating base layer and excellent corrosion resistance as a protective layer.
Features:
① Does not contain harmful substances such as chromium, fluorine, or cyanide.
② Does not contain chemical substances regulated by the PRTR law such as manganese or boron.
③ Can achieve excellent corrosion resistance (≧24Hrs Level 9).
④ Can achieve a film layer with excellent adhesion to the coating (coating adhesion cross-cut test: no peeling).
⑤ The film layer has low resistance and good electromagnetic wave shielding (below 0.3 ohms).
⑥ Wastewater treatment is simple; after neutralization, a small amount of precipitant can be added for discharge.
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