Why do circuit boards have several different colors? The colors of PCB circuit boards in the market are more common in green, black, blue, yellow, purple, red and brown; recently, different colors such as white and pink have appeared. PCB. So, why do circuit boards have several different colors?
In the production of PCB boards, whether the copper layer is manufactured by the additive method or the subtractive method, a smooth and unprotected surface will be obtained in the end. Although the chemical properties of copper are not as active as aluminum, iron, magnesium, etc., in the presence of water, pure copper is easily oxidized when in contact with oxygen. Since the thickness of the copper layer in the PCB circuit board is very thin, the oxidized copper will become a poor conductor of electricity, which will greatly damage the electrical performance of the entire PCB.
In order to prevent copper oxidation, to separate the soldered part of the PCB from the non-soldered part during soldering, and to protect the surface layer of the PCB circuit board, design engineers paint a special paint on the surface of the PCB board to form a certain thickness of protection. layer, and block the contact between copper and air. This layer of coating is called solder resist layer, and the material used is solder resist paint.
For the convenience of maintenance and manufacturing, PCB often needs to print small text on the board. So engineers added a variety of colors to the solder resist paint, and finally formed a black or red or blue PCB.
From this point of view, the color of the PCB has nothing to do with the quality of the PCB. The difference between black PCB and other color PCBs such as blue PCB and yellow PCB is that the color of the solder resist paint on the final brush is different. If the PCB design and manufacturing process are exactly the same, the color will not have any impact on performance, nor will it have any impact on heat dissipation. In recent years, people have used more PCB circuit boards in dark green, dark brown, dark blue and other solder resist paints, the purpose is to facilitate manufacturing and maintenance.
