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Degreasing method of zinc alloy die castings
The publisher:admin Release time:2015-4-22 8:52:07 Reading:72Time

    Zinc alloy die castings are parts of a die casting using zinc powder as the main component of. The surface ofthe part is a layer of dense surface layer, which is the evacuation of porous structure. Can not use acidic degreasing agent, and can only be used for degreasing alkaline degreasing agent.

    most of copper nickel zinc alloy die castings are multilayer coating, the higher demand for decoration. Skim before after mechanical polishing. So go (containing paraffin wax polishing paste) is the first step, and then the chemical degreasing, electrolysis degreasing.

    because the melting point of paraffin wax is in 70% above, in order to emulsified wax, wax removing watertemperature higher than 70 DEG C is effective. In the past people just use ordinary chemical degreasing solution to improve temperature wax. This method is long, efficiency is low. There are special wax removal water supply, shorten the time, better effect. If the use of ultrasonic effect is better. Generally, removing wax water only except the wax debinding, and then chemical degreasing. The chemical activity of zinc alloy is very strong, alkaline chemical degreasing solution can not be too strong, otherwise it will corrosion surface.Temperature control in general between 50 to 70 DEG C, 3 - 5MIN. The market supply of products also haveto skim degreasing agent and removing wax be made one, and the ultrasonic effect is very good.

    Electrolytic degreasing agent composition and chemical degreasing agent is similar to that of zinc alloy die castings. But must contain complexing agents can be used. In the electrolytic degreasing, zinc alloy die casting should be placed on the cathode temperature degreasing, at 50 to 70 DEG C, current density of 35A / DM2, 1 - 2MIN.   

     in the choice of dewaxing and degreasing in one process, die casting surface under the effect of ultrasonicsometimes Brown corrosion film. The degreasing agent should not be used. Degreasing agent should be replaced for zinc alloy die castings.

 
 

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