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Reasons for the yellowing of aluminium alloy extrusion
Release time:
2022-08-15 09:51
Source:
Aluminium alloy extrusion is made from aluminium ingots by hot melting, extrusion and surface treatment. Extrusion and surface preparation are important steps. The extrusion speed is also affected by the cooling temperature and the spraying process, which will cause many surface problems, such as air bubbles, yellowing and chromatic aberration in industrial aluminum profiles.
Let's analyze the reasons for the yellowing of the surface of aluminum alloy extrusion.
1. Caused by the extrusion process In order to improve the hardness of aluminum alloy extrusion and maintain the stability of other mechanical properties, it is necessary to take out industrial aluminum profiles after extrusion, and then quench and cool.
At this point, the choice of coolant is very important. Is it water or other oil based coolant?
The effects of different natural methods will vary.
If cooled with water, since aluminum is a chemically active metal element, it is easy to combine with oxygen in the air to form Al2O3,
Al2O3 then reacts with other impurities or gases in the air to form chemical products.
If the control is not good, it will cause defects such as yellowing on the surface of the profile, which will affect the appearance quality.
2. The surface oxide film of the aluminum alloy extrusion after extrusion molding caused by the surface treatment process is very thin and soft, the performance is unstable, and the corrosion resistance is not strong, and anodizing treatment is required.
A dense oxide film is formed on the surface, which can enhance the mechanical properties and appearance properties of industrial aluminum profiles.
Before anodizing, surface pretreatment is required to remove oil stains and oxide films on the surface of industrial aluminum profiles.
It should be noted that the water washing needs to be thorough to prevent subsequent anodization, which may cause the oxide film to not be well colored, resulting in oxidation yellowing.
The above is the explanation of the cause of yellowing on the surface of aluminum alloy extrusion, I hope it will be helpful to everyone.
aluminium,alloy,extrusion
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Tel: 86-512-53640771
Fax: 86-512-53640769
E-mail：sales@alumag.com.cn(Domestic sales)
export@alumag.com.cn(Export)
Web:http://www.alumag.com.cn/
Address: No. 9, Xingang East Road, Liujiagang, Fuqiao Town, Taicang City, Jiangsu Province, China