To improve the adhesion of the galvanized layer, we can start from many aspects.
Author: Marisa
To improve the adhesion of the galvanized layer, we can start from many aspects:
1. Optimize galvanized sheet and coating formula
Select suitable galvanized sheet: Ensure that the substrate of the galvanized sheet is of good quality, without internal defects, pores, etc., to reduce the poor adhesion of the zinc layer caused by substrate problems.
Formulate suitable coatings: Select coating formulas with good compatibility and reactivity with galvanized sheets to avoid substances or phenomena that are not conducive to adhesion.
2. Optimize the surface treatment process of galvanized sheets
Remove surface impurities: Remove impurities and passivation layers on the surface of galvanized sheets by mechanical or chemical methods, increase surface roughness and active points, and improve the contact and bonding between the coating and the galvanized layer.
Increase surface roughness: Use mechanical methods (such as grooving, marking, etc.) or chemical methods (such as pickling, phosphating, etc.) to increase the roughness on the surface of galvanized sheets to provide better adhesion.
3. Optimize the spraying and curing process of galvanized sheets
Adjust spraying parameters: adjust spraying pressure, voltage, temperature, time and other parameters to ensure that the coating can be evenly sprayed on the galvanized sheet and fully leveled and cured.
Ensure curing quality: ensure that the coating can achieve the best effect during the curing process to avoid insufficient or excessive curing causing decreased adhesion.
4. Perform surface conversion treatment on galvanized sheets
Phosphating, passivation and other treatments: form a thin film that is conducive to adhesion between the galvanized layer and the coating, which acts as a bridge and enhances the bonding between the coating and the galvanized layer.
5. Strictly control galvanizing process parameters
Galvanizing time and temperature control: according to specific material and process requirements, strictly control the galvanizing time and temperature to avoid too thick a zinc layer or excessive internal stress caused by too long a galvanizing time or too high a temperature.
Adjust the composition of the galvanizing solution: according to actual needs, adjust the composition of the galvanizing solution to ensure that the chemical substances in the galvanizing solution are appropriate to improve the quality and adhesion of the galvanized layer.
6. Pay attention to environmental factors
Avoid corrosive environment: During use, try to avoid placing galvanized sheets in a humid and corrosive environment to reduce the impact of environmental factors on the adhesion of the zinc layer.
7. Regular maintenance and inspection
Regular inspection: Regularly inspect galvanized sheets to promptly detect and deal with problems such as zinc layer shedding and cracking to prevent further expansion of the problem.
Maintenance measures: According to the inspection results, take corresponding maintenance measures, such as repair and replacement, to ensure that the adhesion of the galvanized sheet remains in good condition.