Reasons for Strictly Controlling the Temperature of Chromate Passivation Solution

When galvanized steel pipes undergo passivation treatment in a passivation solution, the temperature of the chromate passivation solution used should be strictly controlled to below 50°C. If the temperature of the passivation solution becomes too high, it becomes difficult to form a passivation film on the surface of the galvanized layer. Since passivation films can dissolve in hot water, even if a passivation film is accidentally formed in the passivation solution, there is a high likelihood that it will eventually dissolve. Therefore, during the passivation treatment process, the temperature range specified in the process specifications should be strictly adhered to for control purposes.