[China Aluminum Network] Zinc-aluminum die casting is a powder die-cast zinc-based component. The appearance of this part is a very dense surface layer with a porous structure inside. Can not use acid degreaser, but can only use alkaline degreasing agent for degreasing.
Most zinc-aluminum parts require copper-plated nickel-chromium multilayer coatings, which require a high degree of decoration. Before degreasing, it was all mechanically polished. So dewaxing (white wax in the polishing paste) is on the front, followed by chemical degreasing and electrolytic degreasing.
Because the melting point of ash is more than 70%, for the purpose of emulsifying ash, it is useful only if the temperature of wax water is higher than 70Â°C. In the past, people only used general chemical degreasing fluid to improve the temperature and remove wax. This method is long and low power. Today there is a special supply of dewaxing water that is shortened and has a good effect. If you use the ultrasonic effect is very good. In addition to the wax, water is generally not degreasing except for wax, and chemical degreasing is required. The chemical activity of the zinc alloy is very strong, and the alkalinity of the chemical degreasing solution cannot be too strong, otherwise it will corrode appearance. The temperature is usually controlled between 50 ~ 70 Â°C, time 3 ~ 5min. The products supplied on the market also have degreasing agents that degrease and remove waxes, and they work well together with ultrasonics.
The electrolytic degreaser composition of the zinc alloy part is similar to the chemical degreasing agent. However, it is necessary to use rich complexing agents. In the electrolytic degreasing, zinc alloy die castings should be placed on the cathode degreasing, the temperature at 50 ~ 70 Â°C, current density 3 ~ 5A/dm2, time 1 ~ 2min.
In selecting the wax removal and degreasing two-in-one process, a brown corrosion film sometimes occurs on the surface of the die casting under the effect of ultrasonic waves. This degreaser should not be used. Replace degreasers dedicated to zinc die castings. This should pay special attention.
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