Aluminum alloy die-casting parts have the characteristics of low specific gravity and high strength, and can even approach or exceed lightweight steel. They are an excellent type of metal product. Some types of aluminum alloy die-casting parts can effectively improve their physical, chemical, and mechanical properties through heat treatment, so aluminum alloy die-casting parts are very popular.

However, aluminum alloy has a relatively loose structure and high porosity, so its formability is not good. The produced die-casting is prone to some defects, some of which are still inside the die-casting parts. To repair the defects, infiltration treatment is needed. Infiltration, also known as immersion, infiltration, infiltration, is a process of infiltrating the product into the infiltration liquid, filling the pores of the product with the infiltration liquid through natural infiltration, vacuum pumping, pressure and other methods. After the infiltration liquid solidifies, it can achieve the effect of filling the pores.

The treatment of infiltration can be divided into two types: local infiltration and overall infiltration. Local infiltration methods include brush coating, injection coating, infiltration coating, and local pressure infiltration, which are suitable for aluminum castings with known defect areas; There are four methods of overall infiltration: atmospheric infiltration, pressure infiltration, vacuum infiltration, and vacuum pressure infiltration, which are suitable for large-scale processing of small and medium-sized castings.