Burnishing is a metal finishing process that creates a thin layer of iron oxide on steel products, providing corrosion protection. Bluing techniques include cold, hot, and fumigation or rust bluing. Regular maintenance is important to keep the finish intact. Home bluing kits are available.
Burnishing is a metal finishing process that provides some corrosion protection. In this process, manufacturers and metalworkers create a thin layer of iron oxide on the surface of steel products. This limits the chances of corrosion and keeps the steel in good condition, although it may require regular lubrication and other maintenance. Bluing can be used on weapons, tools and other steel products. It does not work with metals that do not contain iron, as the necessary chemical reaction cannot occur.
Several techniques are in widespread use. These include cold processes in which technicians spread compounds on the steel, hot bluing, and fumigation or rust bluing, which facilitates the slow development of an iron oxide layer. Cold methods are the least effective, while smoking produces high quality results, but can be time consuming and expensive which tends to make it less desirable, except for expensive equipment which may benefit from the added protection.
All these processes trigger the controlled oxidation of the metal. This chemical reaction facilitates the formation of iron oxide, which will gradually spread over the surface of the metal and create an extremely thin layer of material. The underlying steel should remain in good condition as long as the surface is well preserved. Hardness and other characteristics depend on the manufacturing processes used to make the steel and can vary between products.
As the name suggests, bluing adds a slight blue tint to the finished product. In addition to protecting the steel from corrosion, it can resist some surface scratches and abrasions. Regular cleaning and oiling helps keep the surface clean and even. Maintaining the finish is important, as once the iron oxide begins to scratch or flake, the underlying metal can be vulnerable to rust. It is also possible to remove the bluing if the finish is not desirable.
Companies that use blue in their manufacturing can offer different finishes to their customers. People can choose raw metal if they want to apply the finishes themselves or they can choose between different oxidized coatings. Maintenance and restoration equipment can also be sent in to remove and replace the finish if it becomes worn and less effective. Some companies specialize in handling antiques and other one-of-a-kind items that may need extra attention in the refinishing process.
Home bluing kits are available for people who want to refinish steel parts at home or restore equipment that needs a new finish. It is important to always work with clean equipment and carefully control the process to achieve the desired effect. Once the finish is applied, regular maintenance can help it last longer.
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