Analysis of the influence of plastic plating-hanger quality on the electroplating effect of workpiece.
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In plastic plating, the use of pendant is indispensable. How to better improve the utilization rate of the hanger, prolong the life of the hanger, and reduce the impact of the hanger on electroplating has become the main competition direction of the products of various manufacturers. The broad sense of hanger includes hanger, hook, bracket, basket and so on. For electroplating, the workpiece should be attached to the pre-treatment and electroplating of the hanger. The hanger is the carrier of the workpiece, which is indispensable in electroplating production. The effects of fixtures are as follows:
The coating of the hanger is thick and the conductivity is poor, resulting in a thin coating on the workpiece.
The receiving resistance of the workpiece is required to be less than 1m Ω, otherwise the metal can not be adsorbed on the workpiece or the adsorption thickness is insufficient, and the poor conductivity of the workpiece makes the droplet orientation poor, which can not reach the process thickness within the specified time.
The way to overcome this defect is to clean the hanging point and, if necessary, the whole hanger, and the method of connecting wires has a good effect. The cleaning of the hanging point is a daily maintenance work, using pliers, grinders and other tools is simple and fast, to clean to expose the metal matrix of the hanger. The electrical conductivity of the hanging point is good, which can meet the needs, but when the whole is thick, the hanger appears clumsy, which requires the whole to be unmolded. There are three methods of deplasticizing: manual beating, low efficiency and poor effect; solvent soaking, deplasticizing clean, fast, but the solvent contains volatile components and halogenated hydrocarbons, there is no ideal method for the treatment of swollen and shedding coatings. The hot cleaning furnace uses high temperature to decompose the organic components in the coating, and the products are harmless gases and solids, which is a better way of deplasticizing at present, but the magnet pendant will lose its magnetism at high temperature, so high temperature method should be avoided. Poor grounding of the hanger not only affects the thickness of the coating, but also produces electric sparks under high voltage, which is more harmful to the electrostatic spray paint with solvent volatilization, which is a major safety hidden danger. The electrical conductivity of the hanger should be increased through the design, and the plastic should be removed in time.
There are two cases of thin local coating caused by the hanger, one is the phenomenon of grabbing the metal between the hanger and the workpiece caused by the close distance between the plating surface and the hanger, which needs to be solved by increasing the distance between them; the other is that the loose arrangement of the workpiece on the hanger causes the metal to pass through the workpiece or attach to the back of the workpiece, which needs to be solved by adjusting the amount of metal.
Metal shedding causes impurity particles on the surface of the coating.
In order to maintain the electrical conductivity of the hanger, the hanger should be deplasticized periodically. No matter what kind of deplasticizing method, the unmolded pendant will more or less remain oxide scale and lacquer skin, resulting in quality problems of surface impurities.
In most cases, after the appearance of impurities in the coating, the first measure taken by people is to clean the oven, even once a week, without studying the source of impurities in the oven. In fact, the impurities in the oven come from two aspects: the smaller and lighter dust, the wool comes from the air, and the impurities brought by the pendant are of all size. from the analysis of the particle size on the surface of the coating, we can judge whether it comes from the powder itself. For the oven with forced hot air circulation, the paint and rust collapse at the curing temperature, and the solidified environment is polluted by the circulating hot air, resulting in particle defects, so it is important to prevent coating acrobatics to ensure the cleanliness of the hanger after deplasticizing.
