Anti-fall Chemical Liquid 200L Galvanized Bucket 200L Iron Bucket Wan Shuo Manufacturer PVF Coated Steel Bucket Supply.
Surface pretreatment
The metal part of the steel-plastic composite barrel needs to be sandblasted to Sa2.5 cleanliness with a roughness of 40-70μm to ensure the adhesion of the coating. The plastic part needs corona or flame treatment to improve the surface energy.
Primer selection
Metal part: epoxy zinc-rich primer (zinc content ≥80%) is preferred to delay corrosion through electrochemical protection.
Plastic part: epoxy modified primer is used to enhance the adhesion with plastic substrate.
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