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 into some size, at least one conductive Patterns and holes (such as component holes, fastening holes, metallized holes, etc.) are used to replace the chassis of the electronic components of the previous device and realize the interconnection between the electronic components. Because this board uses electronics It is made by printing, so it is called “printed” circuit board. It is not accurate to call “printed circuit board” as “printed circuit” because there is no “printed component” 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.
The corrosion process of PCB circuit board:
The corrosive liquid is usually prepared with ferric chloride and water. The ferric chloride is a yellowish 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, or warm water (not hot water to prevent the paint from falling off) can make the reaction faster Note that ferric chloride is somewhat corrosive. Try not to touch your skin and clothes. Use a cheap plastic basin 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 (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 with sandpaper, revealing the shiny copper foil, and a printed circuit board is ready. In order to preserve the results, the polished PCB circuit board is usually coated with a rosin solution, which can not only assist the soldering, but also prevent oxidation.