Neodymium magnets are powerful magnets used in many different applications. Most of the magnets from stock are nickel-plated. Nickel is an excellent choice to protect the magnet as it is highly resistant to corrosive attack. Unfortunately, the same big nickel properties that make it ideal for protecting the magnet to make it difficult for adhesives form a chemical bond to adhere to the substrate. Also, the nickel plating process creates a very smooth, hard surface, further reducing the ability of the adhesive to create a bond satisfactory to the metal.
When using stock neodymium magnets, types of glue that really work are very limited. The best choice is a two-component epoxy adhesive. These glues are mixed before use, by creating their own chemical reaction to stick the magnets to another object.
Before gluing stock neodymium magnets, users should take the time to prepare the surface to interact with glue and create the best possible bond. Clean and degrease the surface of nickel plating to start. This will require the use of an industrial solvent degreaser. Alcohol and household cleaners do not have the power effective degreaser to clean the magnet and prepare it for gluing. Once the fat is removed, use a 200 grit Emery to sand the surface. The goal is to create a pretty surface texture to the glue and without cracking the nickel, which would allow the magnet to corrode. After abrasion of the surface clean and degrease a second time. To test preparation, pour a few drops of water on top. If the water spreads to wet the surface and not of pearls, is ready to receive the adhesive and form a strong bond. Be sure to let it dry before you mix the adhesive and trying to glue the magnet on the surface the surface.
The surface will be joined the magnet must also be prepared to receive the magnet. Make sure that it is also free from grease, dust or other debris. If this surface is extremely smooth as nickel plated neodymium magnet, you may need to sand the surface as well.
Epoxy mix according to package instructions. Normally, this is to mix equal parts hardener and adhesive. Mix only the amount of adhesive that can be used in a short period of time. Apply the magnet and attach to the surface. Clamp place to dry if necessary.