Almost any metal adhesive you can find in stores is highly durable. Most often, the bonded structure is destroyed not inside the adhesive layer, but at the boundaries of the metal to be joined. Thus, the strength of the adhesive bond primarily depends on the preparation of the surface.
Usually the coating is contaminated with various oils, scale, paint residues, traces of corrosion. All this can be eliminated both chemically and mechanically.
Before applying glue to metal, the contaminated surface is treated with solutions of acids or alkalis, as well as special compounds for removing rust and cleaning. The action of an acid or alkali is based on the fact that oxides are destroyed faster than the base material. Chemical cleaning is faster and much less expensive than mechanical cleaning. In addition, a resistant layer is formed on the metal surface, which increases the strength and durability of the adhesive joint.
Mechanical cleaning of the surface alsoperform before applying metal adhesive.
In this case, processing is carried out using abrasive materials (metal brushes, shot blasting machines, sandblasting or sandpaper). The resulting surface becomes rougher, which increases the area of \u200b\u200binteraction between the adhesive and the metal, therefore, the strength of the connection increases.
Today there are various adhesives for metal on the market, which have their own characteristics and composition.
One of the common materials is polyvinyl acetate glue (PVA). It allows you to work with wood, glass, metal, leather, fabrics, etc. The substance is applied in a thin layer on previously degreased surfaces, which are tightly compressed. Glue setting occurs after 20 minutes, complete drying is observed after a day.
Demanded and such a well-known adhesive for rubber and metal, as "Moment". It is also capable of bonding wood, ceramic, plastic, felt, rigid PVC, etc. This material is toxic and flammable. It should only be handled in well-ventilated or open areas away from sources of ignition.
The product is applied in a thin layer on prepared surfaces, held for a quarter of an hour, and then the materials to be joined are compressed for a few seconds.
Almost everyone knows about epoxy glue, which also allows you to join metal, glass, wood and other materials. Besides,the tool is used to seal cracks and holes, it can be used as a varnish coating.
This metal adhesive is oil and water resistant and a good insulator. The substance is toxic. In case of contact with skin, it must be washed off immediately with warm water and soap. The tool can not be used for gluing food products. The adhesive itself is prepared using the resin and hardener included in the kit in a ratio of 10 to 1. After stirring for 10 minutes, apply the solution on the surface in a thin layer, and then connect them. Partial polymerization of the solution will occur after 4 hours, complete hardening occurs within a day.
