PCB circuit boards are widely used in electronics, computers, electrical appliances, mechanical equipment and other industries. It is the support of components and is mainly used to connect components to provide electrical. Among them, 4-layer and 6-layer circuit boards are common and widely used. Different levels of PCB layers can be selected according to industry applications. Below, let us understand the basic knowledge of PCB circuit board and the process of PCB board corrosion.

　　Printed circuit board:

　　Also known as printed circuit board, printed circuit board, printed circuit board for short, PCB (printed circuitboard or PWB (printedwiringboard) for short, using insulating board as the base material, cut to size, with at least one conductive pattern attached to it, and with holes (Such as component holes, fastening holes, metallized holes, etc.), used to replace the chassis of the electronic components of the previous device, and realize the interconnection between the electronic components. Because this board is made by electronic printing, so It is called a "printed" circuit board. It is not accurate to call a "printed circuit board" as a "printed circuit" because there are no "printed components" on the printed board but only wiring.

　　PCB circuit board is an important electronic component and a support for electronic components. The automatic soldering machine provides technical support for the soldering of PCB circuit boards, so that the development of electronic components can be improved. However, the problem of corrosion of PBC circuit boards has been plagued by automatic soldering vendors.

　　PCB circuit board corrosion process:

　　The corrosive liquid is usually made up of ferric chloride and water. Ferric chloride is a khaki solid, and it is easy to absorb moisture in the air, so it should be sealed and stored. When preparing the ferric chloride solution, 40% ferric chloride and 60% water are generally used. Of course, more ferric chloride is used, or warm water (not hot water to prevent the paint from falling off) can make the reaction faster Note that ferric chloride is extremely corrosive. Try not to touch your skin and clothes. Use cheap plastic basins for the reaction container, just fit the circuit board.

　　Start to corrode the PCB circuit board from the edge. When the unpainted copper foil is corroded, the circuit board should be taken out in time to prevent the paint from eroding away useful circuits. At this time, rinse with clean water, and scrape off the paint with bamboo chips by the way (at this time, the paint comes out of the liquid and is easier to remove). If it is not easy to scratch, just rinse it with hot water. Then wipe it dry and polish it clean with sandpaper, revealing the shiny copper foil, and a printed circuit board is ready. In order to preserve the results, the polished PCB circuit boards are usually coated with a rosin solution, which can not only assist the soldering, but also prevent oxidation.

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