R2S Tec
R2S Tec

Non Stick Coatings

against molten metals

Functional principle
The coating acts as a non-wetting, chemically inert separating layer between the component and the molten metal. Oxide ceramic surfaces are poorly wetted by liquid zinc, and no reaction layer forms. As a result, zinc neither adheres to the surface nor penetrates it. A dense microstructure with low, non-interconnected porosity is essential, since open pores would absorb melt and enable mechanical anchoring.

R2S Tec

Application in the zinc bath
The coating protects components operating in molten zinc during hot-dip galvanizing (approx. 450 °C), in particular sink rolls, stabilizing rolls, snouts and pot hardware, as well as stirrers, pumps and guide elements. It is applied by thermal spraying of dense oxide ceramic layers onto steel or cast substrates.

Advantages

  • Reduced zinc adhesion on component surfaces, resulting in fewer deposits and less frequent cleaning stops
  • Suppressed Fe–Zn reaction, resulting in lower iron pick-up in the bath and reduced dross formation
  • More uniform strip surface due to reduced transfer of dross and zinc build-up
  • Longer component service life and lower maintenance effort
  • High chemical resistance to molten zinc