Rust forms when ferrous metals like steel and iron oxidize. Oxidation causes industrial metal components to become weak and start to break down. Coatings can help prevent corrosion and rust on metals. These coatings are specially designed to prevent oxidation by protecting metals from water and oxygen; the two factors required for rust to develop. Zinc coatings shield ferrous metals from rusting. Zinc will be corroded before zinc coated metal parts start to rust. The protected ferrous metal part remains unaffected as the zinc coating corrodes. A process known as anodizing helps to eliminate or minimize corrosion in non-ferrous metals.
The first step involves cleaning the metal surface or parts. This helps to ensure that all dirt and other foreign substances are scraped off the surface of the metal before the coating can be applied. Dry the metal surfaces after cleaning. Some metals require additional preparation procedures after cleaning.
Apply the coating on the metal surface. Some of the best coatings for preventing the development of rust on metal surfaces include grease and oil. These coatings provide an extra layer of protection that helps to shield the metal surface from water and oxygen. If you are coating an industrial component, be sure to apply coating on the component as well as all parts that come in contact with it.
Apply primer and paint or a rust-proof primer. Primers and rustproof paints are normally used on large metal surfaces. The coating can be applied using vacuum coating equipment. Make sure the surfaces you want to coat are well prepared by removing any dirt, loose paint, or corrosion. Clean greased surfaces with trisodium phosphate or solvent as directed by the manufacturer. It is important to note that primers and rustproof paints cannot be applied to the surfaces of moving parts.
Apply a rust-resistant resin on the metal surface. Resin come in a wide range of colors and provide durable rust prevention layer on metal surfaces. However, they are more expensive than paint.
Apply zinc coating to chemically protect the underlying metal. You can apply zinc coating on metal surfaces by spraying or brushing. When rusting or oxidation occurs, the zinc will oxidize leaving the ferrous metal underneath unaffected. This process prevents weakening and corrosion of the ferrous metal.
The final step involves anodizing the metal parts. Anodizing is a manufacturing process that is usually done on new metal parts and often carried out by professionals.