PCB board production teaching process, copper plating is a business is very important key steps. In this article, the study will start from scratch,multilayer pcb fabrication detailed analysis and introduction of PCB board how to copper plating, to help our readers can understand the role and process of PCB copper plating.
The role of PCB copper plating
Copper plating is very important in the PCB production process. First of all, copper is a conductor of electricity, which can provide excellent electrical conductivity,1 oz vs 2 oz Copper thus realizing the transmission of electronic signals on the PCB. Secondly, copper plating can increase the hardness and abrasion resistance of the PCB, protecting the board from damage. In addition, copper plating can prevent oxidation and corrosion, extending the life of the PCB. In general, the role of copper plating on PCBs is to provide excellent electrical conductivity, increase mechanical strength, and protect the circuitry of the PCB.
How to copper plate PCB boards
The following will introduce a common method of copper plating on PCB boards for beginners to get started.
1. Production of coppering solution
First prepare a certain percentage of coppering solution, generally composed of copper sulfate, sulfuric acid and hydrochloric acid. Copper sulfate and sulfuric acid in accordance with a certain proportion of mixed, add enough water, and mix well. Then add hydrochloric acid into the mixture gradually and continue to stir. The final liquid obtained is the coppering solution.
2. Cleaning PCB board
The made PCB board will be used as well as acetone or other system cleaners directly for data cleaning to remove the dirt and oxidized layer on the surface of the material. Then rinse it with water and keep a kind of dry.
3.Coating photosensitive adhesive
Coat the photosensitive adhesive evenly on the copper-plated surface of the PCB board and seal it with a light-blocking plate. Then put the PCB board into the dryer to make the photosensitive adhesive completely dry.
4. Exposure and development
Align the dried PCB with the drawing layer and use the exposure machine for exposure. Then put the exposed PCB into the developer, the unexposed photopolymer is partially dissolved by the developer, so that the copper disk pattern appears.
5. Copper Plating
According to the copper disk pattern, the PCB board into the copper plating solution for copper plating. First chemical copper plating on the PCB board, and then electroplating, so that the copper layer is more solid. According to different needs, can be repeated copper plating, in order to obtain a thicker copper layer.
6. Cleaning and trimming
Copper-plated PCB with dilute sulfuric acid cleaning to remove the surface of the oxide layer. Then trimming, remove excess copper layer, make the circuit on the PCB more clear.
7.Final Processing
Research anti-corrosion technology treatment of the trimmed PCB board to protect the copper layer from oxidation and corrosion.
PCB copper plating process
The whole process of copper plating of printed circuit boards can be summarized as follows: cleaning of printed circuit boards - coating photosensitive adhesive - exposure development - copper plating - cleaning and finishing - final processing.
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