What are the impacts of excessive drying time for steel pipes?

When steel pipes coated with solvent are dried in a drying oven, excessive drying time can have two implications: one is an excessively long drying time at a higher temperature, and the other is an excessively long drying time at a lower temperature. If the drying time is too long at a higher temperature, the solvent will be overheated, leading to scorching and yellowing on the surface of the steel pipe. Such a solvent will lose its镀锌-aiding effect and result in galvanizing omissions. On the other hand, if the drying time is too long at a lower temperature, the moisture in the solvent will not evaporate quickly. When the moisture migrates towards the ends of the steel pipe holes, it will remain on the inner walls of the holes at both ends, diluting the solvent components and creating favorable conditions for oxidation. This can lead to galvanizing omissions on the inner walls of the holes at both ends and the occurrence of "explosion" (rapid ejection of zinc liquid) during immersion galvanizing.