Zinc-nickel coatings with high-quality corrosion protection
Process: Zinc-nickel alkaline Application: Barrel and rack application
With PREMIUM BLACK we offer you a zinc-nickel surface system for mass-produced and rack goods which can be used wherever extremely high corrosion resistance with high temperature loads is needed, for example. The nickel content of between 12 % to 16 % in the coating system ensures first-class corrosion protection even after heat treatment. It meets the specifications of the automotive industry. Components with zinc-nickel coatings can therefore be used in engine compartments, axle fasteners and brake area in the automotive construction industry.
The system consists of a metal coating produced by zinc-nickel electrolytes with a homogeneous nickel incorporation rate between 12 and 16 %, a black passivation process and an additional sealing process which is applied to the passivation coating closing any cracks and pores at the same time. The sealants developed by us are tailored to our passivation systems, sustainably improve the corrosion protection and increase the mechanical resistance of the surface. For connecting elements, the friction coefficient can be adjusted according to the international standards of the automotive industry.
• Excellent corrosion protection of > 720 hours in accordance with DIN EN ISO 9227 • Very well suited for complex geometries • Homogeneous and long-lasting overall black appearance • Excellent white rust resistance • Constant temperature resistance at 180 °C • Uniform thin layer thickness
Layer structure
The surface consists of the alloy coating with a very homogeneously distributed nickel deposition rate between 12 and 16 %, a black-coloured passivation covering offering the best protection against greying and white rust and, depending on the requirements, a top coat or a sealant.
Our sealants and top coats are adaptively matched to the passivations and sustainably increase the corrosion protection and the surface hardness. Friction coefficients can be adjusted individually according to the requirements by the use of various friction agents.
Corrosion protection
PREMIUM BLACK sets standards in corrosion protection behaviour in relation to the layer thickness. Thanks to its high thermal load capacity without performance loss, PREMIUM BLACK is suitable for installation in engine bays, brake systems and exhaust systems. The characteristically high hardness of the ZnNi alloy layer is advantages for abrasive and impact loads. 
