What is powder metallization?
What is cold powder metallization and when is it used?
Powder metallization is the application of a molten metal layer on a damaged (usually due to corrosion) metal surface. Importantly, this surface is also subjected to the melting process. In this way, we can successfully replace the welding process, which sometimes cannot be performed due to the high probability of damage to some elements of the regenerated surface. A common term we use for this process is surfacing. Powder metallization companies use many proven coating techniques. In this way, we regenerate metal surfaces affected by corrosion or protect them. This is an extremely effective and proven way to revitalize metals where welding is not an option due to specific elements.
The powder metallization process, depending on the necessity, can be performed both cold and hot. First, we will focus on cold surfacing. Well, this type of powder metallization is used when we cannot allow structural changes to the surface to be renovated. Also in the case of a potential risk of deformation and destruction of elements, this is the best solution. Powders whose chemical composition allows them to be dedicated to the activity in question are intended for cold surfacing. Cold surfacing is most often used to prevent the negative effects of impacts or friction.
Before we subject the metal to the surfacing process, we must take care of its initial treatment: cleaning with corundum, grinding. We can also use turning. Then, we apply a primer coat to the metal surface, which is to ensure stabilization and good adhesion of the second – main layer. The main layer is characterized by appropriate operating properties and thus protects the metal against undesirable physical factors.
Cold powder metallization is performed to initiate the process of the so-called diffusion welding. As a result, a metallic bond is formed between the coating and the metal surface. As a result of this process, we also obtain the so-called micropores in the coating of the regenerated metal surface. There is therefore a greater chance of retaining the lubricant that will cover our metal. We can perform cold surfacing on all metals. The exception are elements made of pure copper.
Companies providing metal surface regeneration services using the powder metallization process also prefer hot cladding. All thanks to the powders intended for this purpose. If our metals are subjected to the hot surfacing process, we will obtain overlays resistant to mechanical damage, i.e. friction, even under high pressure. Of course, thanks to this process, we will also provide effective protection against corrosion and oxidation during hot weather. As in the case of cold surfacing, the metal subjected to the process should be cleaned with corundum and ground. Making protective coatings using this process is most often done in the case of removing possible casting defects or revitalizing tire molds. Molds used in factories specializing in the production of glass are also subject to the discussed process, as well as dies intended for deep drawing. Hot powder metallization is also the only method of repairing exhaust manifolds.