Our processes in detail

Overview

1. Acidic gloss zinc bath

Thick layer passivisation* (transparent, chromium VI-free)

  • Glossy, dependent on zinc electrolytes, colourless to light yellow, light reddish-blue passivisation layer with excellent corrosion protection
  • Chromium VI-free passivation, contains no chromium
  • Suitable for passivation of tin coated products out of weakly acidic and alkaline zinc baths

Trivalent blue passivation* (chromium VI-free)

  • Good gloss effect as well as haze-free brilliant blue tone with extremely good corrosion resistance
  • Suitable for passivation of tin coated products out of weakly acidic and alkaline zinc baths

Yellow chromating (contains chromium VI)

  • Produces a yellow undertone on galvanic deposited zinc, colourful iridescent protective layer
  • Chromate layer complies with increased corrosion protection requirements
  • Improved adhesion of chromating prior to lacquering or powder coating

Sealing

  • Particularly good corrosion protection due to enhanced addition of special inorganic micro-silicon compounds in combination with polyacrylates
  • Also offers good gliding properties
  • Suitable for sealing of tin coated, passivated or yellow chromated and phosphated parts

2. Alkaline zinc processes

Thick layer passivisation* (transparent, chromium VI-free)

  • Glossy, dependent on zinc electrolytes, colourless to light yellow, light reddish-blue passivisation layer with excellent corrosion protection
  • Chromium VI-free passivation, contains no chromium
  • Suitable for passivation of tin coated products out of weakly acidic and alkaline zinc baths

Trivalent blue passivation* (chromium VI-free)

  • Good gloss effect as well as haze-free brilliant blue tone with extremely good corrosion resistance
  • Suitable for passivation of tin coated products out of weakly acidic and alkaline zinc baths

Black passivation (chromium VI-free)

  • Produces black passivation layers on alkaline, deposited zinc coatings
  • Extremely well suited for coating of rack parts
  • Trivalent chromium (CrIII) passivation
  • Completely free from chromium (VI)
  • Very good corrosion protection in combination with subsequent sealing 

3. Hard chrome plating, fluoride-free

  • Exceptional hardness (900 to c. 1000 HV), wear resistance, good tarnish and corrosion resistance against atmospheric influences
  • Layer thicknesses of up to 0.1 mm are possible
  • Increasingly important in mechanical engineering, the automotive industry and hydraulics

4. Bright chrome plating

  • Decoratively glossy chromium layers are deposited on bright nickel
  • Excellent coverage

5. Semi-bright nickel

  • High adhesion, high ductility-formability, good levelling
  • Semi-bright nickel coatings are deposited
  • Primarily for the production of double-nickel layers on parts which are particularly exposed to corrosion
  • Also as semi-bright sulphur-free as double nickel plating for copper

6. Bright nickel

  • Process for deposition of high-gloss and consistent light nickel coatings
  • Extremely well suited for subsequent bright chrome plating

7. Manganese phosphating

  • The tightly fused phosphate layer provides consistent friction coefficients following a short running-in period
  • High quality corrosion protection in combination with rust-protection oiling, which gives the workpieces a decorative, anti-reflective appearance
  • Chemical immersion phosphating, therefore a very fine crystalline, almost completely black manganese phosphate layer

8. Bright copper

  • For rapid deposition of strong and glossy copper coatings on iron, steel, brass and zinc die castings 
  • Copper coating can then be passivated, nickel coated, tin coated, or chromated

9. SurTec 650 chromitAL TCP

  • Excellent corrosion protection comparable to hexavalent passivations
  • Chromium VI-free, trivalent passivation
  • Suitable for high-alloy aluminium, casting and forged parts, extremely well suited as a primer for lacquers and glues
  • Fulfils corrosion protection requirements in accordance with MIL 5541 and MIL-DTL-81706 (336h salt spray test in accordance with DIN 50021 SS)
  • Low surface resistance <0.8mOhm/cm²

10. Fe/zinc-nickel compact system

  • Highly corrosion resistant layers comply with the requirements of the automotive industry
  • Alkaline alloy process which deposits layers with 12-15% nickel content

11. Our "Niro-look" process

Corrosion protection in accordance with DIN EN ISO 9227 NSS

"Niro-look" is a thick layer passivation. It delays the formation of white rust (corrosion of the zinc layer) and, for corrosion protection, can replace yellow chromating. In both processes, tested on the same parts, equally good corrosion values were measured. The protection level can be further improved by additionally applying post-dip solutions or top coats on the thick layer passivation (depending on the geometry of the part). Under no circumstances are either alkaline, acidic or abrasive cleaning products, or mechanical cleaning pads, to be used. These damage the layer, and the design and corrosion protection function are permanently destroyed.

Colour

The colour design for "Niro-look" is fundamentally limited to the intrinsic colour. The colour of passivation (without additionally applying post-dip solutions or top coats) is iridescent, strong red-green. If post-dip solutions or top coats are applied on the thick layer passivation, the surface gains a "silk gloss" appearance. This means that the silk gloss metallic undercoat of the zinc layer becomes visible. A slightly iridescent surface can be seen even after application of post-dip solutions and top coats. Good thick layer passivations have a layer thickness of >30µm.

Layer thickness area

  • Rack parts: 8-25µm
  • Barrel parts: 8-20µm