What are the precautions for electroplating of aluminum alloy die castings?

Different alloy materials can be die-casted into different products through different production processes, including aluminum alloy die-casting, magnesium alloy die-casting, etc., and then processed into finished products through surface treatment. As a common process, aluminum alloy die-casting electroplating Surface treatment is highly complex, and Yian Technology reminds you to pay attention to the following issues during the treatment process.

1. Reduce the defects of aluminum alloy die castings when forming

Simply put, in the production process of aluminum die castings, the occurrence of surface defects (common defects such as surface sand holes, shrinkage, etc.) should be avoided due to the unsuitability of die-casting molds, die-casting environment (cooling system, pressure system, etc.), die-casting machines, and manual operation methods. , cold streaks, etched molds, lack of material, etc.), which further affects the increase in the defect rate of the electroplating process of aluminum alloy die castings.

2. Avoid the occurrence of defects due to improper surface polishing

Surface polishing is the primary processing technology before electroplating for aluminum alloy die castings, and it is also very important. Polishing is to remove some defects on the surface of black embryo castings, and at the same time achieve the purpose of a smooth and smooth surface so that subsequent electroplating is easier. However, this process should avoid artificial shortages, such as deformation, dimensional changes, etc., and quality control should be strictly controlled.

3. To avoid quality problems after plating caused by incomplete cleaning before plating

Before electroplating, aluminum alloy dies castings need to undergo ultrasonic cleaning to remove wax and oil, so as to achieve a clean surface and ensure the reliability of subsequent electroplating. This process must be carried out in strict accordance with the operating instructions, and the time, temperature, and sound wave parameters must be set to meet the process requirements…

4. Avoid poor adhesion and produce defective products

The adhesion of alloy products can be tested by a harsh 100-grid test to know whether the plating layer is firm. However, because the surface activity of aluminum alloys is not as high as that of zinc alloys, the adhesion of aluminum alloy die castings after electroplating is not so easy to control. The general solution in the industry is to perform pre-plating treatment before formal plating, that is, passivate the surface and add a copper bottom, and then perform formal plating. This solution is recognized by the industry.

In a word, in the electroplating process of aluminum alloy die castings, even if the materials of the die castings are the same, there will be differences in the electroplating process due to the operation method. When ensuring the product quality after the final surface treatment, it is necessary to calmly analyze and find suitable Solutions to reduce the defect rate in production.

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