The Perfect Finish for Metal
For centuries, man has tried to halt the oxidation process that naturally occurs when certain metals are exposed to the atmosphere, and has had some degree of success with a variety of processes and applications that manage to slow down, or stop the decaying process. Iron and steel are very durable metals, except for the fact that they corrode over time.
The Blackening Process
Although it is named blacking, the actual colour after the process in blue, and in some parts of the world, it is called blueing, and more recently, chemical blackening has been used to describe this age old process. The big advantage with this process is that it does not increase the dimensions of the metal object, unlike plating or painting, so it is ideal for precision engineered parts where there is little or no tolerance. Metal blackening can be used with iron, steel, aluminium and zinc, and produces a tough, durable finish that is ideal for machined parts.
Room Temperature Immersion
The blackening process is carried out by dipping the metal, which causes a chemical reaction and results in a uniform covering. The final stage of the process involves oil immersion for anti-corrosive qualities, and the finish is not a coating or covering, which means precision work is not affected by added layers. There are several stages in the process, including degreasing, surface conditioning, and the blackening immersion.
A Variety of Applications
The blackening process is ideal for precision made machine parts, especially threads and bolt holes, with many types of machine using this process. Chains and sprockets can be treated, as can gears and other automotive parts, and all types of machine tools can be treated with the blackening process.
This process will turn bright brass surfaces dark, and after a 5 minute dip, the brass is left to dry and then abraded to remove any proud surfaces. The finished surface gives the brass an antique look, and this is becoming a very popular way to treat old brass items.
The process is suitable for the following:
- Furniture fittings
It also works well with suitcase fittings, coins, models, and clocks, so if you have anything old that you would like to protect and give a special look, then the antiquing process is the ideal solution.
This blackening process is only carried out by specialised companies, who have extensive experience in treating a range of metals. Many industries require this process, especially with precision machined parts where there is tight tolerance, and as the process is not a coating, the dimensions are not affected.
The Ideal solution
Whether you are machining parts, or you would like to add some character to antique furniture, the blackening process is ideal, as it is very durable, and more importantly, it offers the protection without changing dimensions.
Many industries rely on this unique finishing process, as it offers total protection without increasing size, and with precision components, this is vital.