PCB Copper Plating Copper Plating Analysis of the pinhole

Sept. 30, 2010 - PRLog -- RayMing PCB - www.raypcb.com

PCB Copper Plating Copper Plating Analysis of the pinhole
This article discusses the process of copper plating copper PCB appears pinhole, and suggests ways to find the pinhole copper plating, for reference.

A copper coating appears possible causes of pinhole:
Chloride bath is too low, the air mixing uneven, granular impurities in the bath, the bath there is organic pollution, the board of pollution.

Find pinhole copper plating two ways:
1. Air mixing uneven: analyzes the reasons for copper plating pinhole air mixing systems, first check whether it is normal; such as uneven mixing will affect the filtration system to filter results. Available light board test plating, to enhance filtration, try coating the light board if the copper coating without pinholes, that is the reason for the uneven mixing of air due to address the strengthening of air stirring; if there are pinhole copper coating can be from other areas Check.

2. Low chloride bath: the cause of pinhole copper plating plating liquid chlorine ions from the second area to examine, analyze the concentration of chloride ion in the bath; chloride ions are phosphor copper anode activator, can help P normal dissolution of copper anode, when the chloride ion concentration below 20 mg / L, will have a rough coating stripe appeared the phenomenon of pinhole and burned. If the chloride ion is too low, can be solved by adding hydrochloric acid, light board test plating, copper plating if the light is still pinhole plate, and from other aspects of inspection.

3. Suspended solid particles in the bath: To observe the shape of the pinhole, if the irregular shape, that is caused by particles suspended solids; First, strengthen the filter, and then try plated light board, if the pinhole-free copper plating that is caused by dirty bath; if there are irregular pinhole copper plating that is caused by the granular material on the process. If after a light board plating found no pinhole, and then drilled holes in the board to see if there are pin holes plating.

4. Bath with organic pollution: To observe the shape of the pinhole, if the hole was like, that is caused by organic pollutants; First, carbon treatment, plating test light board, if the light board is no pinhole in the copper plating that there is a bath of organic pollution may be caused by copper brightener and other reagents; light board if there are pinholes in the copper plating that caused by the process. Light board is only available test printed circuit diagram plating, copper plating if no pinhole, that is the ink, due to contrast residues; if the copper plating without pinhole, you can check other processes.

5. If the board also have a dirty needle surface phenomenon, with sulfuric acid and the solution to the oil after the circuit board PCB plating treatment, such as the pinhole is not found, check whether the brush plate will produce pollution machine , still have to check if other processes.

PCB copper plating pinhole produces a variety of reasons, the above points for your reference, hoping to help.

RayMing PCB - www.raypcb.com

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