Vacuum plating overview
Vacuum plating include: vacuum evaporation, sputtering and ion plating several types. They are used in the vacuum conditions, by means of distillation or sputtering deposited on the surface of plastic parts of various metal and non-metallic film, in this way can be very thin surface coating, with good speed and good adhesion outstanding The advantages, however, are higher prices and fewer types of metals that can be handled, typically used for functional coatings of higher grade products, for example as internal shields.
Common plastic products electroplating process in two ways: water plating and vacuum ion plating.
Vacuum ion plating, also known as vacuum coating. Vacuum plating is now a more popular approach, the product made of metal strong, high brightness. And compared to other coating method, the lower cost, environmental pollution Small, now widely used by various industries.
Vacuum plating the scope of application
Vacuum plating a wider range of applications, such as ABS material, ABS + PC material, PC material products.At the same time because of its complex process, the environment, high equipment requirements, the price is more expensive than water plating.A brief introduction to its process: product Surface cleaning -> to static -> spray primer -> baking primer -> vacuum coating -> spray paint -> baking finish -> packaging.
Vacuum plating practice
The general practice of vacuum plating is to spray a layer of primer on the material before making electroplating.As the material is plastic parts, air bubbles, organic gases remain in the injection molding, and will inhale the water in the air when placed.In addition, As the plastic surface is not smooth enough, the direct plating of the workpiece surface is not smooth, low gloss, poor metal feeling, and there will be bubbles, blisters and other bad conditions.A layer of primer after spraying, will form a smooth surface, and put an end to Plastic bubble blisters exist, making the plating effect can be demonstrated.
Vacuum plating can be divided into
General vacuum plating, UV vacuum plating, vacuum plating special. Process has evaporation, sputtering, gun color and so on.
PC material temperature 130 degrees, only "vacuum plating + UV oil solid" can be achieved 130 degrees high temperature requirements. The general water plating is not PC material plating!
2 vacuum plating process
Vacuum deposition method is a method of heating a metal under high vacuum to melt, evaporate and form a metal thin film on a plastic surface. Commonly used metal is aluminum and other low melting point metal.
Method of heating the metal: the use of heat generated by the resistance, but also the use of electron beam.
When plastic products are deposited, the evaporation time must be adjusted in order to ensure that the resin does not deform when the metal is cooled. In addition, the melting point, too high boiling point of the metal or alloy is not suitable for evaporation.
To be plated and plated plastic products in the vacuum chamber, using certain methods to heat the material to be plated, the metal evaporation or sublimation, metal vapor condensation of cold plastic products encountered in the surface of the metal film.
Under vacuum, atoms in the evaporating material can be reduced, molecules collide with other molecules during the flight to the plastic product, and chemical reactions (such as oxidation) between the active molecules in the gas and the evaporation source material can be reduced to provide the Density, Purity, Deposition Rate and Adhesion. Vacuum deposition is usually required to be equal to or less than 10-2 Pa in the chamber and less pressure (10-5 Pa) for applications where the source of evaporation and the quality of the product to be plated and the film are demanding.
Coating thickness 0.04-0.1um too thin, low reflectivity; too thick, poor adhesion, easy to fall off. Reflectivity of 90% at a thickness of 0.04.
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3 vacuum plating characteristics
1> vacuum coating obtained by the thin layer of metal film (usually 0.01 ~ 0.1um), can be strictly copied from the shape of beer surface
2> Operating voltage is not very high (200V), easy to operate, but the equipment is more expensive.
3> Evaporator pot volume is small, the number of pieces of plating less, lower production efficiency.
4> Only limited to the melting point of tungsten than the metal (such as aluminum, silver, copper, gold, etc.) plating.
5> The surface of the plating quality requirements are higher, usually before plating primer oil to make up for the workpiece surface defects.
6> vacuum coating can be plated a variety of plastics such as: ABS ﹑ PE ﹑ ﹑ ﹑ ﹑ ﹑ ﹑ PC ﹑ PMMA ﹑ ﹑ such as PMMA 
Article from NdFeB Industry Network