The application of automotive aluminum alloys is becoming more and more important!
With the intensification of environmental pollution and energy crisis, reducing the weight and fuel consumption of automobiles has become an important direction for the green development of the automobile industry.
Aluminum alloys for automobiles have entered people's attention. Lightweight automobiles can not only alleviate the energy crisis to a certain extent, but also help control environmental pollution. Therefore, the topic of vehicle lightweighting is of great practical significance.
Aluminum alloys have excellent casting properties. Appropriate alloys and casting methods can be selected according to the application purpose, part shape, dimensional accuracy, quantity, quality standards, mechanical properties and economic benefits. Mainly used in the manufacture of engine blocks, clutch boxes, steering wheel boxes, transmissions, etc. Non-engine components such as wheels, engine structure, brake calipers, cylinders and brake discs. In addition to mechanical properties and corrosion resistance that meet the requirements of standards and specifications, aluminum alloy automotive body panels should also have the following properties:
1. Good formability, the body and sheet metal parts are all formed by stamping, therefore, the aluminum alloy sheet should have good formability, that is, low yield ratio and high forming limit;
2. The good chemical conversion performance of zirconium/titanium salt forms the conversion film layer of the zirconium/titanium salt treatment system, creating a good foundation for lubricating oil adsorption. The treatment solution is environmentally friendly and does not contain chromium. It is mainly composed of metal salts such as titanium, zirconium, fluorine, nitrate and organic additives. A conversion film is formed on ABS by dipping and spraying, and the obtained film has a strong bond with the organic polymer;
3. Good weldability, which can meet the requirements of welding of auto parts after forming. The sheet metal should have anti-aging stability to ensure that no aging occurs before the sheet metal manufacturing and stamping production, and prevent the increase of the yield point of the material during the stamping process, which affects the surface quality of the outer panel of the automobile;
Fourth, light-duty vehicles also need high sheet metal properties, that is to say, the increase in sheet yield strength is obviously after stamping deformation and spray paint baking, to ensure high concave resistance after the metal plate, aluminum alloy plate, need spray paint baking technology and current Compatibility of steel stamping components;
5. The surface finish is strong, and the aluminum alloy sheet must have good flanging ductility and uniform surface color after forming, that is, there is no slip line on the surface of the formed sheet parts. Slip lines are caused by uneven grain size or uneven distribution of inclusions, resulting in uneven surface deformation and inconsistent surface gloss after spraying.