The electrophoretic coating line should be cleaned in a dry environment. This is because gasoline is very volatile and will absorb a lot of heat when it volatilizes, causing the surface temperature of the workpiece to decrease. The water vapor in the moist air condenses on the metal surface to form a water film, which causes corrosion. At the same time, gasoline is volatile, flammable and explosive, which is the disadvantage of gasoline cleaning.

The volatility of kerosene and light diesel is lower than that of gasoline. It usually leaves traces after volatilization. It has a higher flash point than gasoline and is safer to use. Condensation on the surface of the part can be avoided after cleaning. Generally, petroleum solvents can remove oil stains. If it is not thorough, it usually contains a small amount of non-volatile components, so degreasing with petroleum solvents will not meet the coating requirements. It can be used for top cleaning only when the parts are heavy.

Chlorinated hydrocarbon solvents: mainly including triethylene, whole ship ethylene, dihydromethane, trifluorotrifluoroethane, methyl dihydro, carbon tetrachloride, etc. They have good degreasing ability. It has good effects on mineral oil and animal and vegetable oils. This solvent has a low boiling point, is volatile, but has no tenderness, is safe to use in production, and does not corrode metals. The disadvantage is that the cost is high, it is toxic to the human body, and it needs to be equipped with special and complicated steam cleaning equipment. Therefore, organic solvent cleaning becomes more and more restricted, especially with the large-scale application of surfactants, they are gradually eliminated.