What is Metal blackening and its benefits?
What is known as “blackening,” is the procedure of chemically transforming the surface of a metal (often steel, but it can also be done with other ferrous metals such as iron, aluminium and zinc) to a black oxide. Oxide is another given term actually related to rust, but if it is created in the ideal type of atmospheric conditions, it will form a structurally patterned type of rust which is then called oxide. The blackening process that has been used over the past 5– 6 decades is known as the “hot process”.
This has been the most favoured technique used during that time period and is where a blackening solution temperature is heated up to 285 degrees to finish the black oxide operation. As many people know, water happens to boil at 212 degrees Fahrenheit, so, this method has to be carried out by skilled professionals and experts in their trade for safety reasons, and their seasoned experience will give the finished product that special touch.
Cold Temperature Process
Another possible method which is becoming more popular, is called a cold or room temperature metal blackening process. This type of chemical metal blackening can be seen in professional workshops and is normally a slightly cheaper technique. A number of workshops offer both methods which give customers the choice of procedure they prefer.
A long time ago, blackening was known as “bluing”. Bluing was an old name normally used when finishing off a gun barrel or part. The chemical that was utilised for bluing in those old days has since been made illegal, so that these days there isn’t any real bluing going on any more like you see on the older guns. If you make a request for a gun part to be “blued,” you are actually getting it “blackened.”
What are the Main Advantages of Blackening?
- Superbly efficient corrosion protection
- A great finish for parts that can be stored for later processing
- The thickness of the coating is only 10’s of millionths of an inch thick
- No dimensional (tolerance) adjustment.
- Advancements in lubricity
- Extremely affordable process and especially so nowadays
- No concerns of any kind of brittleness or pitting happening
- Perfect aesthetic and decorative finish
- A great reduction in light glare
- Pre-treatment for all types of paint
- Great conductivity is still preserved
- Say goodbye to all those awful welding fumes
The industrial room temperature blacking method is an uncomplicated dip process which is especially worked out for use in blackening factories. This technique results in a uniform colouring which totally covers all machined nooks and crannies, and is brought to the perfect finish by the chemical transformation of the metal surface. The whole procedure will require degreasing, immersion in a surface conditioner, and then the blacking solution itself. Perfect corrosion protection is then made possible by a concluding dip in a dewatering oil.
Blackening has become a major advantage with maximum benefits for all metals it deals with.