One. Poor solvent resistance of color steel plate
Features: Butanone wipes off a little paint.
Resons: 1. The baking temperature does not meet the requirements. 2. The curing of coatings is problematic. Three. The pretreatment is not clean.
Two. Leakage coating of coloured steel plate
Characteristics: Unpainted topcoat.
Reason: 1. The edge finish is not coated, the bottom plate is not good or the pressure between the coated roll and the rear roll is insufficient. 2. There is no coating on the inner surface of the plate. After
the primer is cooled, there is water or other foreign matter on the surface of the board.
3. Poor bending of coloured steel plate (T-bending)
Characteristic: Cracks and coating peeling occur at the processing site during 180 degree bending
test of steel.
Reasons: 1. Excessive mastery of pretreatment. 2. The coating is too thick. Three. Overbaking. 4. Primer coatings are different from paint manufacturers or improper use of diluents.
Four. Poor hardness of coloured steel plate
Features: Brushes are used for hard scraping on the surface of coatings, leaving scratches on the surface after scratching.
Reasons: 1. Low furnace temperature, insufficient curing of coating. 2. Improper heating conditions.
Three. The thickness of the coating is thicker than the specified thickness.
This is the introduction of common quality problems of color coated steel plate.