Aluminizálással

Aluminizálással refers to the process of applying a coating of aluminum to another metal, typically steel. This coating serves as a protective barrier against corrosion and high temperatures. The most common method for aluminizing is hot-dip aluminizing, where the steel component is immersed in a bath of molten aluminum. Before immersion, the steel is cleaned and fluxed to ensure good adhesion of the aluminum coating. As the steel is withdrawn from the molten bath, a layer of aluminum solidifies on its surface.

Another method is calorizing, a form of diffusion aluminizing. In this process, steel is heated in contact with aluminum powder, often mixed with an inert filler and an activator like ammonium chloride. At high temperatures, aluminum diffuses into the surface of the steel, forming an alloy layer that provides protection. Spray aluminizing, where molten aluminum is sprayed onto the steel surface, is also employed.

The primary benefit of aluminizing is the excellent corrosion resistance it imparts, particularly in environments containing sulfur compounds and at elevated temperatures. This makes aluminized steel suitable for applications such as exhaust systems, heat exchangers, industrial chimneys, and certain types of cookware. The aluminum coating also offers some sacrificial protection, similar to galvanizing, where the aluminum corrodes preferentially to the underlying steel. The thickness and composition of the aluminized layer can be controlled to meet specific performance requirements.