Steam oxidation treatment as a surface treatment process is applied to the hot work die steel, it can generate a protective blue Fe3O4 film on the surface of the steel material, which has high temperature resistance, oxidation resistance, compactness, wear resistance , corrosion resistance, bonding strength with the substrate, favorable lubrication and other advantages. It can improve the hot and cold fatigue resistance of the mold and the hot melt loss resistance of the molten aluminum alloy. The hot working mold is slightly oxidized before use, usually heated to 500°C in air for 1-2 hours, to produce a 1-10 μm oxide layer on the mold surface.
The die steel is oxidized under different oxidizing atmosphere, steam pressure, temperature and holding time to obtain a surface oxide film with different ratios of Fe3O4 and Fe3O3 components. The thickness, density, thermal fatigue resistance and anti-melting loss of the obtained oxide layer are different. And welding performance is also different. Appropriate oxidation process is applied to the aluminum alloy die casting mold to obtain better comprehensive performance, which has a high practical value.
Main Features Technical Performance 1. Significantly improve the thermal melting resistance of aluminum alloy die casting molds 2. Significantly increase the service life of aluminum alloy die casting molds 3. Increase the thermal fatigue resistance of aluminum alloy die casting molds
Technical index 1, oxide film thickness μ 3μm
2. Oxidation film is small (microscopic indentation method to observe the oxide film rupture)
3, after the mold oxidation treatment of the anti-melt loss performance (mold loss in the molten aluminum melt heat loss, than the processing is not reduced by about 1 times)
use
Extend the service life of aluminum alloy die casting
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