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Corrosion protection systems

For outstanding corrosion protection

Process sequence

Top coat (silver/black)

Passivate (blue, iridescent/black)

Zinc/zinc alloy electroplated substrate

High-end corrosion protection

NSST > 1,000 h to WR possible

Attractive appearance

Appealing and durable appearance

ELV, RoHS compliant

Fulfillment of all requirements according to ELV, RoHS

Electroplating bath zinc
  • Highest corrosion protection
  • Color stability
  • Chemical resistance
  • Consistent CoF’s
  • Fulfillment of all requirements according to ELV, RoHS, etc.
Automotive_lowOil and gas_lowConstructions_low
  • For demanding applications
  • Applicable to zinc and zinc nickel coatings
  • Rack and barrel plating

Combined coating systems

For outstanding corrosion protection

 

Coating systems that combine zinc/zinc nickel, passivation and top coats are capable of providing products with extraordinary corrosion protection as well an appealing and durable appearance. These combined coating systems allow the industry to keep up with increasing demands especially from the automotive industry – for better corrosion protection and improved appearance of electroplated parts.

Black zinc nickel finishes, in particular, are designed to outperform the normal white corrosion performance provided by electrolytic coatings only. The industry also demands for high-end corrosion resistance without any visual changes, e.g. limited white haze.

Atotech has leveraged the best of both corrosion protection technologies to develop coating sequences that fulfill these ambitious requirements. Besides a stable and attractive appearance, even after neutral salt spray testing (NSST), such layer combinations should also exhibit temperature stability, chemical resistance, consistent coefficient of friction values and much more. These coatings must also fulfill all the requirements of ELV and RoHS.

Process examples

Process description System Corrosion requirements/NSST
Zinc with black passivate and inorganic top coats Unizinc NCZ 428 + Tridur® Zn H1 + Zintek® Top Black S Minimum 96 hours without visible changes
Zinc nickel with black passivate and organic top coats Zinni® AL 450 + Tridur® ZnNi H5 + Techseal® Black SL Minimum 240 hours without visible changes
Zinc nickel with adhesion promoting passivate and inorganic top coats Zinni® AL 450 + EcoTri® NC + Zintek® Top Black S Minimum 240 hours without visible changes, up to 2,000 hours without white corrosion

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