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BLACKING OF STEEL WITH A CHEMICAL BLACKING SOLUTION
V.Ryan © 2018
 
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When manufacturing components from steel, corrosion to the surface will always be a problem, especially if the product / component is in contact with moisture, as carried in the atmosphere. To prevent this happening the surface can be ‘blacked’, through the use of a chemical blacking kit, without the need to heat the steel to ‘red’ heat. The finished surface will prevent tarnishing / corrosion to the surface of steel and produce an attractive black finish. The process is called Cold Chemical Blacking.
 
1. Prepare the surface of the component, through the use of hand tools, such as files and the use of wet and dry paper / emery cloth. OR prepare the surface with a machined finish, through the use of a lathe, miller, surface grinder etc....  
 
 
 
2. Ensure that all surfaces are clean of dirt and grease. Wipe the component clean and soak it in a de-greasing solution. Then rinse in clean water and dry.  
     

3. Using tongs and wearing protective clothing, drop the component into a container of blacking solution and leave it for up to five minutes. Good ventilation is important and even extraction.


4. Remove the component, after no more than five minutes, clean in water and place into dewatering solution and leave for at least ten minutes. This solution will remove any remaining water from the surface and help to create / enhance the black protective layer.

 
 
 
 
The resulting finish, will be dark satin and will be corrosion resistant.  
 
 
 
SAMPLE CHEMICALLY BLACKED COMPONENTS
 
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