What are the measures to prevent salt fog of electronic products PCBA

Salt spray corrosion is one of the most common and most destructive atmospheric corrosion. The corrosion of the surface of metal materials by salt spray is caused by the contained chloride ions penetrating the oxide layer and protective layer on the metal surface and the electrochemical reaction between the internal metal. In order to ensure the performance of PCBA and prolong the storage time, it is necessary to carry out the necessary PCBA salt spray prevention treatment.

The anti-salt spray treatment of PCBA board can be applied with three anti-paint and nano coating materials.

1.Three-proof paint

Tri-proof paint is a commonly used coating material for PCBA storage. Tri-proof paint has good resistance to high and low temperatures; after curing, it forms a transparent protective film, which can be used under conditions such as containing chemical substances (such as fuel, coolant, etc.), vibration, humidity, salt spray, humidity and high temperature Protect the circuit from the environment.

2.Nano coating materials

Nano coating refers to the advanced technology of nano non-toxic coating, and high-tech nano coating technology. Nano-material coating can improve the corrosion protection ability of the substrate, and achieve the purpose of surface modification and decoration. Adding nanoparticles to paint or coating can further improve its protective ability, can resist the damage of the atmosphere and ultraviolet rays, and thus achieve the effects of preventing degradation and discoloration.

Nano-coating technology is a new technology that has a relatively high cost of use. In PCBA plants, three anti-paints are more commonly used, but some components are not suitable for coating with three anti-paints. Special attention should be paid to their use.