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Introduction to Geomet Coatings

Geomet coatings are state-of-the-art, water-based, non-electrolytic coating systems that provide high-performance
corrosion protection for metal components. As a type of zinc flake coating, Geomet is widely used in the automotive,
aerospace, construction, and industrial sectors. It is particularly effective in protecting fasteners, structural elements,
and mechanical parts from rust, wear, and environmental damage.

What Are Geomet Coatings?

Geomet coatings consist of a combination of zinc and aluminum flakes, suspended in a water-based binder. Unlike traditional electroplating or hot-dip galvanizing, Geomet coatings do not require electrical current or excessive thickness to provide robust corrosion resistance. The coating is applied using dip-spin, spray, or dip-drain methods and is then cured at moderate temperatures to form a highly protective barrier.

Key Benefits of Geomet Coatings

• Exceptional Corrosion Resistance: Geomet coatings can withstand over 1,000 hours of salt spray testing, providing long-term protection against oxidation and rust in extreme environments.
• Thin Coating with Maximum Performance: With a thickness range of 5-20 microns, Geomet coatings offer excellent protection without altering the dimensional tolerances of precision-engineered parts.
• No Hydrogen Embrittlement: Since the coating process does not involve electrochemical reactions, there is no risk of hydrogen embrittlement, making Geomet coatings ideal for high-strength steel fasteners and load-bearing components.
• High Temperature and Chemical Resistance: Geomet coatings resist heat up to 300°C and offer excellent protection against chemicals, solvents, and industrial fluids.
• Environmentally Friendly: Geomet coatings are free from heavy metals such as cadmium, lead, and hexavalent chromium (Cr6+), making them compliant with RoHS and REACH environmental standards.
• Excellent Adhesion and Compatibility with Topcoats: Geomet coatings provide a stable base layer for additional lubricants, sealers, or organic topcoats, enhancing durability and functional performance.

Geomet Variants

GEOMET® 500

• Corrosion Protection: GEOMET® 500, alone or in combination with topcoats, provides excellent corrosion resistance, passing severe cyclic corrosion tests.
• Self-Healing Property: Offers protection even after mechanical damage, such as stone chipping.
• Bimetallic Compatibility: Ensures excellent compatibility with aluminum alloys.
• Adjustable Thickness: Ranges from 6 to 15 μm, applied in 1 to 3 layers, depending on application needs.
• Salt Spray Resistance: 720-2000 hours (ISO 9227 / ASTM B117 / JIS Z2371).
• Lubrication: Self-lubricated basecoat provides a controlled friction coefficient (0.12-0.18) per ISO 16047.
• Temperature Resistance: Performance maintained up to 300°C.
• Electrical Conductivity: Avoids bimetallic corrosion in assemblies made of cast iron, carbon steel, and aluminum alloys.
• Paintability: Provides a suitable surface for additional coatings.
• No Hydrogen Embrittlement: Non-electrolytic process prevents hydrogen embrittlement, reducing the risk of metal cracking.

GEOMET® 720

• Provides high corrosion resistance and is primarily used for fasteners in the automotive industry.
• Offers a smooth and uniform coating with enhanced mechanical performance.</li formalized
• Often combined with topcoats to achieve additional functionalities.

GEOMET® 321

• A widely used variant in the automotive and construction industries.
• Features excellent corrosion resistance with a silver-metallic appearance.
• Can be used as a basecoat or with topcoats for enhanced properties.

Zincrokote®

• A specialized zinc flake coating that provides exceptional adhesion and durability.
• Ensures high performance in demanding industrial applications.

Applications of Geomet Coatings

Automotive Industry

Geomet coatings are widely used in automotive manufacturing to protect components such as:

• Bolts, nuts, and washers
• Brake discs and calipers
• Suspension systems
• Engine components
• Chassis parts

Aerospace Industry

Due to their lightweight and high-performance characteristics, Geomet coatings are used in the aerospace sector for:

• Aircraft fasteners
• Landing gear components
• Structural connectors

Construction and Infrastructure

For construction and industrial applications, Geomet coatings enhance durability in:

• Structural steel components
• Bridges and guardrails
• Heavy machinery fasteners

Renewable Energy Sector

Geomet coatings are also applied in wind and solar energy infrastructure to protect against environmental degradation, including:

• Wind turbine bolts and fasteners
• Solar panel mounting hardware

Application Methods of Geomet Coatings

• Dip-Spin Coating: Components are submerged in the coating solution and spun to ensure even coverage and remove excess material. Ideal for small to medium-sized fasteners and mechanical parts.
• Spray Coating: Best for complex or large components where dip-spin is impractical. Ensures a controlled and uniform application.
• Dip-Drain Coating: Suitable for medium to large parts, where components are dipped and then left to drain before curing.
• Brush or Roller Application: Used for on-site maintenance or touch-ups where automated application is not feasible.

Industry Standards and Certifications

Geomet coatings comply with various international standards to ensure reliability and performance:

• ISO 10683 – Zinc flake coatings for fasteners
• ISO 12944 – Corrosion protection of steel structures
• ASTM B117 – Salt spray corrosion testing
• RoHS & REACH Compliance – Environmental safety regulations

Conclusion

Geomet coatings provide an innovative, eco-friendly, and highly effective solution for protecting metal components from corrosion. Their ability to deliver superior protection in a thin layer makes them ideal for industries requiring precision and durability. With compliance to environmental regulations, resistance to hydrogen embrittlement, and excellent adhesion properties, Geomet coatings offer a sustainable and high-performance alternative to traditional coating methods. Whether used in automotive, aerospace, or industrial applications, they contribute to enhanced component lifespan, reduced maintenance costs, and improved overall efficiency.