Black Cobalt Free Passivate for Zinc-Nickel (12-15%)

FINIDIP 728.3 is a black, cobalt-free trivalent chromium passivate for zinc-nickel deposits (12-15% Ni). It produces a deep black surface after passivation and a very glossy aspect after an additional post-treatment with a FINIGARD or POSTDIP product.

The corrosion resistance of the black surfaces produced by FINIDIP 728.3 and an additional Top-Coat system is remarkably high and complies with the requirements of the automotive industry.
The process is suitable for rack and barrel applications. In case of barrel applications it is recommended to add a top-coat in a dip-spin centrifuge.


Features & Benefits

  • Hexavalent chromium and cobalt-free
  • Very glossy and deep black aspect
  • Long solution life
  • Low operating temperature (20-30°C)
  • Economic chemistry consumption
  • Reduced zinc strip rate
  • High corrosion and heat resistance
  • Good layer adhesion and scratch resistance

Fields of application

  • Automotive Industry
  • Building industry
  • Fasteners industry

This process belongs toFINIDIP LINE

FINIDIP is a process line in the trivalent passivation range for Zinc and Zinc alloys of a black, yellow, white or green colour. These formulations protects the sacrificial Zn or Zn-Alloy base coat from corrosion and acts as conversion layer between the Zn (Zn-alloy) and the top coat.

Fields of applications

  • Aerospace
  • Automotive industry
  • Fastener industry
  • Building industry
  • Electrical equipment
  • Electronics and collectors
  • Wire goods

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