Topcoat (Sealer) Processes
Topcoat (sealer) applications are advanced coating systems applied after zinc coating and zinc nickel coating processes to enhance surface performance. These systems play a critical role in increasing corrosion resistance, controlling the coefficient of friction, and improving assembly performance.
As Erkap Industrial Coating Solutions, we provide high-performance and repeatable surface solutions for fasteners and automotive components through our topcoat and dry film lubricant systems applied using dip-spin technology.
- Corrosion-resistant topcoat applications: Topcoat systems applied on zinc coating work together with passivation to form an additional protective barrier on the surface and provide high corrosion resistance under ISO 9227 salt spray test conditions.
- Friction-controlled topcoat applications: Friction-controlled topcoat systems ensure that the coefficient of friction (μ) in fasteners is maintained within specific ranges. These systems may contain dry film lubricants or control friction behavior through different resin-based structures depending on the application. They typically contribute to achieving stable assembly performance within the range of 0.08 – 0.18.
Topcoat applications are an essential part of the multi-layer surface protection approach in modern metal coating systems and act as a complementary element in terms of both corrosion resistance and functional performance.
