What is the process of pcb circuit board corrosion

- Dec 27, 2019-

What is the process of pcb circuit board corrosion

pcb circuit boards are widely used in electronics, computers, electrical appliances, mechanical equipment and other industries. It is a support for components and is mainly used to connect components to provide electrical. The most common and widely used are 4-layer and 6-layer circuit boards. According to industry applications, different levels of pcb board layers can be selected. Below, let's understand the basic knowledge of pcb circuit board and the process of pcb board corrosion.

Printed circuit board:

Also called printed circuit board, printed circuit board, printed board for short, PCB (printed circuit board or PWB (printed wiring board) for short) in English. It is based on an insulating board and cut to a certain size. At least one conductive pattern is attached to the board and printed with Holes (such as component holes, fastening holes, metallized holes, etc.) are used to replace the chassis of electronic components of previous devices, and to achieve the interconnection between electronic components. Since this board is made by electronic printing, It is called a "printed" circuit board. It is not accurate to call a "printed circuit board" a "printed circuit" because there are no "printed components" on the printed board and 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, making the development of electronic components progress. However, the corrosion problem of PBC circuit boards has always troubled automatic soldering merchants. Lianxinghua Electronics has accumulated many years of experience to research and solve the problem of corrosion of PCB circuit boards.

 What is the process of PCB circuit corrosion: 

Rhenium corrosive solution is usually configured by adding ferric chloride and water. Ferric chloride is a khaki solid, and it is also easy to absorb water in the air, so it should be stored sealed. When disposing 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 paint from falling off) can make the reaction faster. Note that ferric chloride is corrosive. Try not to touch the skin and clothes. Use low-cost plastic tubs for the reaction container, which can be placed on the circuit board. 

The PCB circuit board is corroded from the edge. When the unpainted copper foil is corroded, the circuit board should be removed in time to prevent the useful circuits from being corroded after the paint is peeled off. At this time, rinse with water, and scrape the paint off with a bamboo chip, etc. (At this time, the paint comes out of the liquid and is relatively easy to remove). If it is not easy to scratch, just rinse it with hot water. Then dry it and sand it clean with sandpaper to reveal the shiny copper foil and a printed circuit board is ready. In order to save the results, the polished PCB circuit board is usually coated with rosin solution, which can help soldering and prevent oxidation.

Previous:How to analyze PCB impedance and loss Next:12 issues you should pay attention to in analog circuit design