Question

What is the chemical solution used in PCB etching?

Answer 1

The chemical solution used in PCB etching is acidic copper chloride or alkaline copper chloride.
In PCB manufacturing, chemical etching is a process that uses chemical solutions to dissolve unnecessary parts of copper foil to form the desired circuit pattern. Among them, acidic copper chloride and alkaline copper chloride are common etchants. Acidic copper chloride has a slower etching speed, but the solution has a longer storage time; while alkaline copper chloride has a faster etching speed, but the solution has a shorter storage time.

Answer 2

There are a variety of chemical solutions used in PCB etching, depending on the resist type and production conditions. Here are some common chemical solutions:
1. Acidic copper chloride: This is a common etching solution, suitable for etching PCBs whose resist layers are organic resists such as acid ink, photodrying film, and photowetting film.
2. Alkaline copper chloride: suitable for etching PCBs whose resist layers are tin, tin-lead, nickel/gold and other metal resists.
3. Ferric chloride: also commonly used to etch PCB.
4. Sulfuric acid and hydrogen peroxide: used together to etch PCB.
5. Persulfate: also a common etching solution.
The above information is for reference only. If necessary, it is recommended to consult professionals in relevant fields.