Surface enhancements are of great importance in the development and manufacturing of products. However, the processes that are utilized must not pose threats to the environment in the form of toxic waste materials. Products that are anodized are said to have fewer environmental impact because of the process being used. It has been found that the by-products of the anodizing process do not contain volatiles, halogens, and heavy metals. Aluminum-based waste materials like aluminum sulfate and aluminum hydroxide are still utilized through recycling. They are extensively being used in industrial wastewater treatment. In addition, they are also vital components in the manufacturing of fertilizers, baking powder, and newsprint.
Although aluminum alloys are the common type of substrate being protected by anodic films, there are separate anodizing processes for other metals like titanium, magnesium, and zinc. When wear and corrosion resistance are the ultimate objective, the anodizing process provides the ideal protective film. It also enhances metallic surfaces for adhesion before the application of glues or paint primers. Aluminum surfaces that are coated with anodic films have been observed to become harder. If thick coating is to be applied, a sealing process must be introduced to be able to obtain the desired corrosion resistance properties. The application of sealant and thick coating also enhances resistant to wear.
Coatings do not necessarily make metals indestructible. They are just necessary enhancements to achieve protection from wear, aging, and other causes of metal deterioration. If coated materials are subjected to extreme temperatures and pressures, there are coatings that could deteriorate. The breaking point of coatings depends on the materials being employed and the process that is used. In the case of anodizing, it has been established that it gives better protection for aluminum alloys. Another distinct advantage of the process is that it allows dyeing of the coated surface. It is a quality that is hard to find in other types of coating materials. On the other hand, it is of vital importance that the weakness of anodic films be addressed. The exchange of corrosive ions between the substrate and surface can be eliminated through the application of precipitating sealing and hydrothermal sealing.