The main reasons why PCBs taken out of the solution should be cleaned with fresh water are as follows:
1. Remove residual chemicals on the surface: Various chemicals are used in the PCB production process, such as etchants, photoresists, etc. These substances may remain on the PCB surface, affecting its quality and reliability. Cleaning with fresh water can remove these residues and reduce the impact on PCB performance.
2. Avoid corrosion and oxidation: If the chemical substances remaining on the PCB surface are not removed in time, corrosion and oxidation reactions may occur, resulting in PCB performance degradation or failure. Cleaning with fresh water can prevent this from happening.
3. Improve solderability and reliability: Fresh water cleaning can remove the oxide layer or other contaminants that may exist on the PCB surface, improving the solderability and reliability of the PCB. This is very important for the subsequent welding and assembly process, and can reduce problems such as poor welding and virtual welding.
4. Meet environmental protection requirements: Using fresh water to clean PCB can reduce environmental pollution. Compared with using chemicals, the waste liquid produced by freshwater cleaning is easier to handle and more environmentally friendly.
In short, the PCB taken out of the solution should be cleaned with fresh water to ensure that its surface is clean, improve solderability and reliability, meet environmental requirements and avoid potential quality problems.