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Contract treatment

We rapidly and reliably carry out the treatment processes black oxidation, phosphating and stainless steel colouring in our computer-controlled fully automated contract treatment plants. A manually-charged treatment plant is also available for special processes such as the colouring of brass, copper and zinc die-cast components. Profit from our knowledge and experience as a system provider who produces its own chemicals and plants for chemical surface treatments. 

Black oxidation

Black oxidation

The black oxidation coating is chemically generated by immersing workpieces in a boiling, strongly alkaline solution.

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Phosphating

Phosphating

Generated by immersing the workpieces into a heated and acidic zinc, manganese, zinc-calcium or tri-cation phosphate solution. 
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Other colouring methods

Other colouring methods

Classic black oxidation agents, as used elsewhere, cannot be used to colour stainless steel materials.

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Test methods

Bath analysis – Coating thickness measurement through magnetic-inductive method, scanning electron microscopy/energy-dispersive microanalysis, test methods according to standard specifications. 

  • Bath analysis
  • Coating thickness measurement through magnetic-inductive method
  • Scanning electron microscopy/energy-dispersive microanalysis
  • Test methods based on standard specifications

Annealing furnace

Workpieces that have been coated using an acid process and which have a tensile strength of over 1000 N/mm² should be annealed because of the possibility of hydrogen embrittlement. 

Surface treatment plants

We can rapidly and reliably carry out the treatment processes black oxidation (ferrous steel and casts), phosphating (zinc and manganese phosphating) and stainless-steel colouring in our computer-controlled fully automated contract treatment plants. 

A manually-charged treatment plant is also available for special processes such as the colouring of brass, copper and zinc die-cast components. 

You can profit from our knowledge and experience as a manufacturer of chemicals and plants for chemical surface treatments with regards to surface results. 

Plants and their options  

Plant I
Black oxidation of steel and iron as per DIN 50938 with methods groups A and B, and black colouration of stainless steel

  • Bath dimensions, max. (L/W/H): 1800 / 400 / 500 mm 
  • Component weight, max. 300 kg 
  • Treatment possible in immersion basket, drum or on frame 

Plant II
Black oxidation of steel and iron as per DIN 50938 with methods groups A, B and C (C is 3-bath black oxidation)

  • Bath dimensions, max. (L/W/H): 3000 / 500 / 700 mm 
  • Larger components are turned over or rotated for treatment
  • Component weight, max. 1100 kg
  • Treatment in immersion basket, on frame or on hook
  • Treatment in rotation process up to 2220 mm diameter and up to 400 mm width

Plant III 

Zinc phosphating and manganese phosphating as per DIN EN 12476

  • Bath dimensions, max. (L/W/H): 1800 / 400 / 500 mm 
  • Component weight, max. 600 kg 
  • Treatment possible in immersion basket, drum or on frame

Plant IV
Colouration methods

  • Brass colouration (black, brown) 
  • Copper colouration (black) 
  • Die-cast zinc colouration (black) 
  • Bath dimensions, max. (L/W/H): 480 / 200 / 300 mm 
  • Component weight, max. 20 kg 
  • Treatment possible in immersion basket or in drum 
  • You can deliver/pick up your goods at the following times: 
    • Acceptance of goods for contract treatment: Monday to Thursday: 07:00 to 15:40
    • Friday: 07:00 to 12:30
    • We are also happy to help outside these hours by prior agreement.
    • Goods delivered for black oxidation and phosphating are normally ready for pick up on the next working day. Goods for stainless steel, copper, brass and die-cast zinc colouration are normally treated within 2 to 3 working days.