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The comparison

Room temperature or hot blacking

Many companies still blacken their parts hot, above 140 °C, in house or through subcontracting. The Blackfast process does the same work at around 20 °C, in your own workshop. Below are the nine points on which the two differ.

Blackened steel part with a uniform deep black colour
  • Blacking at around 20 °C, instead of above 140 °C
  • No distortion, because no heat is involved
  • Cast iron turns black, not brown
  • Low start-up costs and low running costs

Nine points

The Blackfast process next to hot blacking

Blackfast process
Hot blacking
Blackfast processBlacking at room temperature, 22 °C
Hot blackingBlacking at high temperature, above 140 °C
Blackfast processLow energy costs
Hot blackingHigh energy costs
Blackfast processLow running costs
Hot blackingExpensive process
Blackfast processSafe chemicals that are simple to use
Hot blackingExtremely hazardous, with splashes and fumes
Blackfast processNo distortion
Hot blackingDistortion possible through the high temperature
Blackfast processLow start-up costs
Hot blackingExpensive and complex installation and extraction systems required
Blackfast processSimple in-house system
Hot blackingSerious consequences for the shop floor and its surroundings
Blackfast processBlacking cast iron is possible
Hot blackingCast iron turns brown, not black
Blackfast processEasy process to control
Hot blackingDifficult process to control

These nine points come from Phibo's Blackfast brochure.

From the brochure

Advantages of room temperature black oxide

The advantages the Blackfast process brings to your parts and to your shop floor.

  • 1

    No dimensional change

    No build-up and no material loss, so it suits precision parts that are turned or milled.

  • 2

    High aesthetic value

    A uniform deep black colour, with low light reflection.

  • 3

    Better corrosion resistance

    The blackened surface resists corrosion better, suitable for indoor applications.

  • 4

    Good lubricating properties

    The blackened surface has good lubricating properties, which matters for gears and moving parts.

  • 5

    One minute in the blacking bath

    In the blacking fluid, one minute is enough for a uniform black surface. Above 22 °C or with special materials, thirty seconds can be enough.

References

They rely on Phibo for surface treatment

In practice

A blacking line on the shop floor

Blackfast blacking line with plastic tanks and stainless steel frames
A blacking line fits in an ordinary workshop, without boiling baths.
Automated line lowering a basket of parts into the tank
At higher volumes the baskets are lowered automatically.
Loading basket with parts above a process tank of a blacking line
The parts travel through the baths in a loading basket.

Applications

Where it is used today

Any precision part in steel or cast iron qualifies, turned or milled. Think of gears, bolts and nuts, hydraulic parts and tooling components.

  • Machine building
  • Tool manufacturing
  • Precision engineering
  • Hydraulics
  • Firearms manufacturing
  • Fasteners
  • Gears

Consumables

The fluids are part of the choice

If you switch, Phibo also supplies the fluids your line runs on.

From our own warehouse

The process fluids, the blacking paste and the protective equipment are in stock. You order them from the same partner that supplies your line.

  • Degreaser and conditioner
  • Blacking fluid for steel and cast iron
  • Corrosion-protecting, water-displacing oil
  • Blacking paste for manual work

Assistance and service

Maintenance, spare parts and training

You arrange maintenance, repairs and spare parts directly with Phibo. Our own technicians do the work.

Maintenance contract

We schedule the inspection of your blacking line and follow it up. The content is agreed with you.

Repair and spare parts

Spare parts come from our own warehouse. Our technicians carry out the repair.

Training

Your operators learn to set, monitor and adjust the baths, from commissioning onwards.

We call you and go through your application

Send us the material of your parts, their dimensions and the number per day. You will receive a proposal with the blacking line that suits your parts. One partner, from the first conversation to the last spare part.

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