Comparison with Hot Oxide Method
|Room temperature operation||YES||NO – 140°C|
|Low energy operating cost||YES||NO – high heat up and maintenance cost|
|Safe and easy chemical addition||YES||NO – addition of water and chemicals needs close control to avoid eruptions and splattering|
|Non-fuming baths||YES||NO – extraction necessary|
|Instantly ready for use||YES||NO – bath requires to heat up to 140°C|
|Low capital cost to set up||YES||NO – expensive tanks, heaters, controls and extraction required|
|No heat distortion of parts||YES||NO – distortion can occur|
|Convenient to set up an in-house operation||YES||NO – requires power, services and extraction|
|Blackens cast iron||YES||NO – causes red/brown finish|
Benefits of changing from hot blacking
Those companies that operate their own hot blacking line, or are considering changing their finishing process, can benefit in the following ways by adopting a room temperature blacking line:
- There is no expensive capital equipment required – plastic or rubber lined tanks will work.
- Extraction equipment is either minimal or not necessary as there is no damage to the fabric of the facility – a common fault given the corrosive nature of the fumes from the hot blacking line.
- There are no heating costs, the solution can be used immediately and does not require 2 hours to reach operating temperature.
- There are no salts that subsequently leach out into holes and small orifices.
- A short dwell time allows rapid throughput of production and high coverage per gallon.
- The health benefit to the operator is immeasurable.
The Blackfast solution control is simple and replenishment is achieved by topping-up. Dumping is not necessary as with other systems. The Blackfast process is convenient and can be located anywhere without the need for ventilation or complicated control procedure. The solutions are stable, reliable and surprisingly easy to maintain.
No Dimensional Change
Many machined parts are manufactured to a tight tolerance, which means plating or painting are not acceptable.
The black surface absorbs wax, oil or rust preventative sealants to give corrosion protection.
A durable black finish enhances the appearance and value of a wide range of manufactured articles.
By reducing light glare from moving tooling or machinery, it eases fatigue and contributes to operator safety.
A uniform black finish of steel components is extremely popular, adding considerably to the perceived value of the product. This, combined with the unique quality that component dimensions are not altered and an even colour is achieved over blind holes and threads, makes it a must for any precision engineer.
Any precision engineering company manufacturing metal parts which require colouring and corrosion protection without resulting in dimensional change would benefit by installing their own Blackfast, room temperature blacking line.