company news about Pre-treatment method of electrostatic spraying equipment

Electrostatic spraying equipment - pre-spraying treatment method: electrostatic spraying equipment before spraying the cleaning of the workpiece is particularly important, and the treatment methods are also more diversified. Including spray soaking combined type, full spray type, full soaking type, brush coating type, etc. How to choose mainly depends on the geometric size and shape of the workpiece, investment scale, site area, production and other factors. First, spray - immersion combined type of spray - immersion combined type, generally in a certain process, the workpiece is first sprayed, and then soaked into the tank, and then sprayed after the tank, all the spray and immersion are the same tank. This combination method not only retains the high efficiency of spraying, improves the processing speed, but also has the soaking process, so that all parts of the workpiece can be effectively treated; Therefore, the combination of spray and soak pretreatment can complete the treatment process in a short time, the equipment occupies relatively less space, and can obtain satisfactory treatment results. At present, at home and abroad, for the automotive industry with high pre-treatment requirements, generally tend to adopt the combination of spraying and soaking.

Second, the full spray method is used to pressurize the liquid with a pump, and the pressure of 0.1 ~ 0.2Mpa makes the liquid form a mist, and the electrostatic spraying equipment is sprayed on the workpiece to achieve the treatment effect. Due to the mechanical flushing and liquid updating during spraying, the processing speed is accelerated and the time is shortened. The length of the production line is shortened, and the corresponding section heads the site, equipment, and shortcomings are that the workpiece with more complex geometry, such as the inner cavity, the corner and other liquids are not easy to reach, and the treatment effect is not good, so it is only suitable for processing the workpiece with simple geometry. Spray method is not suitable for pickling rust removal, it will bring equipment corrosion, rust between processes and a series of problems, so the choice of spray pickling must be very careful.

It is reported that full-spray phosphating is easy to form crystalline dendritic coarse, low iron content of phosphating film, foreign countries do not advocate as a cathodic electrophoretic paint before the pre-treatment. The full spray method is mainly used in powder coating, electrostatic coating and anode electrophoresis of household appliances and parts.