PCB plating in the four special plating method
: (PCB board manufacturer )
And share about PCB four special plating in the electroplating method 1, PCB through-hole plating there are various ways to the substrate into a bore hole wall layer meets the requirements of the electric plating, this is called the activation of hole wall in industrial applications, the PCB manufacturers in the production process needs more intermediate storage tank, each storage tank has its own control and maintenance requirements.
Hole drilling process of follow-up is necessary electroplating production process, when the drill through the copper foil and the substrate, the heat generated by the most to make plate substrate the insulation of the synthetic resin melt, the molten resin drilling and other debris piled up around the holes, coated in copper foil newly exposed the hole wall, in fact it is harmful to the subsequent plating surface.
Molten resin in the substrate hole wall under a layer of hot, it for most of the activator showed poor adhesiveness, it need to develop a kind of similar to the stain and back to the corrosion of chemistry technology.
A kind of more suitable for PCB prototyping method is to use a special design of the low viscosity of the ink, used on each hole wall form the effect of high viscosity, high electric conductivity.
So you don't have to use multiple chemical treatment process, only one application steps, then heat curing, can be in all the hole wall of inside to form a continuous film coating, it does not require further treatment can directly electroplating.
The ink is a kind of based on resin material, it has the very strong viscosity, adhesive can effortlessly in most heat polishing of hole wall, so that it eliminates the eclipse this step back.
2, roll wheel gearing type selection of electronic components plated pins and pin, such as connectors, integrated circuits, transistors, and the flexible FPCB board is choose plating is used to obtain good contact resistance and corrosion resistance.
The electroplating method can be used in a manual way, also can use automatic mode, choose a separate for each pin plating is very expensive, so the batch welding must be used.
Usually, will run pp. 47-53 required cutting the ends of the thickness of metal foil, adopt the method of chemical or mechanical cleaning, then has the choice of using like nickel, gold, silver, rhodium, button or tin nickel alloy, copper nickel alloy, nickel lead alloy continuous plating, etc.
In choosing the electroplating plating method, first, on the metal copper foil board does not need to electroplating a layer of retarder on the part of the complex membrane, only in selected parts of the copper foil plating.
3, refers to the platoon type electroplating need to rare metal plating at the edge of the plate edge connectors, highlight the contact or gold finger to provide low contact resistance and high resistance to wear, the technology, called platoon type electroplating or highlight part plating.
Often used the gold plating, nickel plating for the layer of edge connectors highlight touch head, gold finger or edge overhang by manual or automatic plating technology, the contact plug on gold-plated has been plated or gold finger basking, lead plating, plating button is replaced.
The process as follows: 1, strip coating removal tin or tin - highlight the contact
The lead coating.
2, clean water rinse.
3, swab swab with abrasives.
4, activation diffuse in 10% sulfuric acid.
5, in nickel plating thickness of 4 - outstanding touch head
6, washing to remove mineral water.
7, gold osmotic solution treatment.
10 and drying.
4, brush plating, it is a kind of electroplating technology, not all the parts in the process of electroplating immersion in the electrolyte.
In this kind of plating technology, electroplating for only limited area, and for the rest of the part does not have any effect.
Usually, the rare metal plating on the printed circuit board of the selected part, such as edge connectors and other areas.
In the brush plating in the electronics assembly workshop maintenance use more PCBS.
Will be a special anode (
Chemical inert anode, such as graphite)
Wrapped in absorption ability of material,
And use it to plating solution to what is need to electroplating.
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