Release time：2020-01-16 18:44 Browse：
Yes, sealed galvanized long screws can be adhesive-bonded, but the following factors must be considered:
Type of Sealing Layer
Common sealants (e.g., passivation film, epoxy coating, organic sealants) may affect adhesive bonding.
If the sealant is non-reactive (e.g., chromate passivation), choose a compatible adhesive.
If it’s an oily sealant, clean the surface first.
Surface Preparation
Cleaning: Use alcohol, acetone, or a specialized degreaser to remove contaminants.
Roughening: Light sanding or blasting improves mechanical adhesion (avoid damaging the zinc layer).
Adhesive Selection
Epoxy: High strength, corrosion-resistant, ideal for structural bonding.
Polyurethane: Flexible, suitable for dynamic or thermal expansion applications.
Silicone/Anaerobic Adhesive: Used for sealing or thread locking (test compatibility first).
Process Optimization
If high-temperature curing is needed, ensure the sealant and zinc layer can withstand it (hot-dip galvanizing tolerates heat better than electro-galvanizing).
Thread Locking: Apply anaerobic adhesive (e.g., Loctite 243) directly, but test adhesion.
Waterproof Sealing: Use silicone or polyurethane adhesive after proper cleaning.
Structural Bonding: Lightly sand sealed areas, then apply epoxy for maximum strength.
Conduct small-scale tests to verify adhesion.
Avoid acidic or corrosive adhesives that may damage the zinc/sealant.
Consult adhesive suppliers for compatibility with the specific sealant (e.g., chromate vs. non-chromate passivation).
