Surface Treatment of Aluminum, Magnesium and Their Alloys
Aluminum, magnesium and their alloys are a group of materials with excellent mechanical properties, strong corrosion resistance and good thermal conductivity. As the use of aluminum and magnesium alloys expands, the surface treatment of these materials has become increasingly important.
The surface treatment of aluminum, magnesium and their alloys may involve some or all of the following processes: cleaning, polishing, passivation, anodizing, coloring, oiling, coating and painting. Each process has an important role to play in the final product.
The first process, cleaning, is used to remove contaminates from the surface of the metal. It is important to make sure that the surface is free of dirt and dust for an even surface finish. This is typically done with a degreasing solution and a brush or cloth. The degreasing agent will help to break the dirt and grime away from the metal and make the surface more receptive for further treatment.
Polishing is then used to create a smoother and more consistent surface finish. The abrasives used in polishing can vary depending on the desired finish. Common abrasives include buffing wheels, abrasive cloths, and sand paper. The polishing process often involves several different stages and can be very time consuming.
The next step in processing aluminum, magnesium and their alloys is a passivating process. Passivating is a process where the surface of the metal is treated with a chemical solution to improve its corrosion resistance. This can be done either chemically or electrochemically.
Anodizing is the next surface treatment process used on aluminum, magnesium and their alloys. Anodizing involves passing an electric current through the metal, forming a protective oxide layer on the surface. This layer is often dyed to add color, and can be made thicker to increase corrosion resistance.
Coloring is another important surface treatment used on aluminum, magnesium and their alloys. This process is used to add a bright, glossy sheen to the metal. Colorants are typically used to achieve a desired effect.
Oiling is then used to create a protective film on the metal surface. This helps protect the metal from oxidation and abrasion. The oil also helps to reduce friction and wear. An oil-resistant resin is then applied to the metal surface to form a seal.
Coating is then used to protect the metal from scratches, corrosion, and other damage. Coating materials include epoxy, paints, and powder coatings.
Finally, painting is often used on aluminum, magnesium and their alloys. This can be done with a brush, roller, or aerosol paint. In addition to providing a decorative effect, paint can provide additional corrosion resistance and protection.
These are just some of the surface treatments used on aluminum, magnesium and their alloys. Each one has a role to play in improving the properties of the material. As the use of these materials expands, new and improved processes will be developed to meet the changing needs of consumers.
