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Why do circuit boards have several different colors?

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[Abstract]:
Why does the circuit board have several different colors?
The colors of PCB circuit boards in the current market are green, black, blue, yellow, purple, red, and brown. Recently, PCBs of different col
Why does the circuit board have several different colors?
The colors of PCB circuit boards in the current market are green, black, blue, yellow, purple, red, and brown. Recently, PCBs of different colors such as white and pink have appeared. So, why do circuit boards have several different colors?
  
In the production of PCB boards, no matter whether the copper layer is made by additive or subtractive methods, it will finally get a smooth and unprotected surface. 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 in contact with oxygen. Because 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 and non-soldered parts of the PCB during soldering, and to protect the surface of the PCB circuit board, design engineers apply 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 a solder mask, and the material used is a solder mask.
 
PCB in order to facilitate maintenance and manufacturing, it is often necessary to print small text on the board. Therefore, engineers added a variety of colors to the solder mask, and finally a black or red, blue PCB was formed.
 
From this point of view, the color of the PCB board has nothing to do with the quality of the PCB. The difference between black PCB and blue PCB, yellow PCB and other color PCBs lies in the color of the solder mask that is applied at the end. If the PCB design and manufacturing process are exactly the same, the color will not have any effect on performance, nor will it have any effect on heat dissipation. In recent years, people have used more solder resist paints such as dark green, dark brown, and dark blue for PCB circuit board.