The key to metal bonding is proper surface preparation no matter how strong the adhesive is, it will never stick to surfaces that have not been prepped correctly. With these ground rules, you create bonds that last.
Clean Thoroughly
First and foremost, make sure any dirt, grease or oil – among other things – is completely gone. Use a degreaser or a solvent like acetone/isopropyl alcohol. Clean all surfaces with a clean, lint-free cloth and let them dry completely. Even your hands contain oils that could cause adhesion failure on the freshly prepared areas, so try to avoid touching them. When you need Metal bonding adhesive, contact www.ct1.com/product-applications/metal-to-metal-adhesive/
Remove Oxidation and Rust
Metal surfaces are often covered in oxidation layers or rust and this does not allow an effective bond from forming. You can scrub off this layer of oxidation by scratching that area with sandpaper or even wire brushes, abrasive pads. This is especially important for aluminium, as it oxidises rapidly.
Create Surface Texture
Adhesives just cannot have a grip on the smooth polished metal. Mild abrasion with 120-180 grit sandpaper forms a micro-texture enhancing surface area and mechanical adhesion. For best results sand in various directions.
Final Clean
Clean surfaces a second time to remove any dust or debris that can be produced from sanding. With it typically being the second cleaning, this step is often forgotten but imperative for bonding purposes.
Work Quickly
Aluminium alloys, in particular reoxidize quickly after preparation. You’ll want to glue within 30 minutes of the last cleaning. If any delays occur , clean again.
Check Compatibility
Make sure that the adhesive you choose is compatible with your metals. Different metals pair better with specific adhesives.
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