Zinc Flake Coatings
A thin, high-performance anti-corrosion coating based on zinc and aluminium flakes in an inorganic or organic binder, used on fasteners and underbody components.
Overview
Zinc flake coatings (e.g. Geomet™, Dacromet™, Delta-Protekt™) consist of overlapping zinc and aluminium flakes in a binder matrix, applied by dip-spinning or spraying. They provide galvanic (sacrificial) corrosion protection at very thin coating thicknesses (5–15 µm) with excellent salt spray resistance (720–2,000+ hours). Critically, zinc flake systems are chromium-free and hydrogen embrittlement-free, making them the preferred choice for high-strength fasteners and safety-critical components. In automotive applications they are widely used on bolts, nuts, springs, brake components, and underbody fittings.
Automotive Applications
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Barite (Barium Sulphate)
Mineral Filler
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Properties
Category
Type
Corrosion Protection Coating
Available Colors
Available Forms
Key Properties
- Excellent cathodic corrosion protection
- No hydrogen embrittlement
- Chromium-free
- Very thin coating
- High salt spray resistance
- Consistent torque-tension characteristics
Technical Specifications
Density
2.5–3.5 g/cm³ (cured coating)
Sustainability
Sustainability Rating
Chromium-free formulations comply with ELV Directive and RoHS. Thin coating application minimises material use while maximising protection.