Question

How long does it take to repair PCB board oxidation?

Answer 1

PCB board surface oxidation takes 1 to 2 days to repair.

After the PCB board surface is oxidized, the oxidized surface of the inner copper foil can be reduced with an alkaline solution containing dimethylborane as the main component. The reduced metallic copper can enhance acid resistance and improve adhesion; use a pH value of 3 Treat the copper surface whiskers with ~3.5 sodium thiosulfate reducing solution, acid leaching and passivation, and use ESCA to form a coating layer of copper and cuprous oxide mixture; use 1~2% hydrogen peroxide, 9~20% inorganic acid, 0.5 A mixture of ~2.5% tetraamine-based cationic surfactant, 0.1~1% corrosion inhibitor and 0.05~1% hydrogen peroxide stabilizer is used to treat the copper surface of the inner layer before laminating. The chemical tin plating process is used as the inner layer. The covering layer on the copper foil surface of the laminate.

Answer 2

The time it takes to repair PCB board oxidation depends on the degree of oxidation and the repair method. If you use alcohol or thinner to wipe, soak the alcohol or thinner in a pure cotton cloth and gently wipe the oxidized part until the oxide is removed. This process may take several minutes to dozens of minutes. If a special cleaner is used, it may take anywhere from a few minutes to a few hours, depending on the situation.

If the PCB board is severely oxidized, more complex processing is required.

For example, use sodium thiosulfate reducing solution with a pH value of 3--3.5 to treat copper surface whiskers, acid leaching and passivation, and use ESCA to form a coating layer of a mixture of copper and cuprous oxide, or use 1-2% hydrogen peroxide. A mixture of 9-20% inorganic acid, 0.5-2.5% tetraamine-based cationic surfactant, 0.1-1% corrosion inhibitor and 0.05-1% hydrogen peroxide stabilizer is used to treat the copper surface of the inner layer plate before proceeding with the lamination process, etc. , these processes can take anywhere from hours to days.

Therefore, the time to repair PCB board oxidation depends on the degree of oxidation and the repair method, and the specific time needs to be determined based on the actual situation.