Process of PCB Board Corrosion

PCB 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 electricity. Among them, 4-layer and 6-layer circuit boards are the most common and widely used. , According to industry applications, different levels of pcb board layers can be selected. Let’s learn about the basic knowledge of pcb boards and the process of pcb board corrosion.

Printed Circuit Board:

Also known as printed circuit board, PCB board for short or PWB (printed wiring board) for short, using insulating board as the base material, cut into a certain size, at least one conductive pattern attached to it, and with 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 is made by electronic printing, 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.

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

What is the process of PCB board corrosion?

The corrosive liquid is usually made up of 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 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 (Please note that ferric chloride is corrosive). Not use it touch your skin and clothes. Use a cheap plastic basin for the reaction vessel to place the circuit board.

Start to corrode the PCB 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 boards are usually coated with a rosin solution, which can not only assist the soldering, but also prevent oxidation.

XPCB Limited is a manufacturer specializing in the production of high-precision double-sided, multi-layer and impedance, blind buried vias, and thick copper circuit boards. The products cover HDI, thick copper, backplanes, rigid-flex, and buried capacitance, Golden Finger and other types of circuit boards, which can meet the needs of customers for various products.