Dacromet / Geomet Coating
Dacromet and Geomet coatings are water-based, inorganic zinc-aluminum flake coatings applied to metal parts for corrosion protection. Commonly used in automotive and industrial applications as part of conversion coatings.
Description
Overview of Dacromet / Geomet Coating
Dacromet and Geomet are proprietary water-based, inorganic coatings that use zinc and aluminum flakes to protect metal surfaces from corrosion. These coatings are applied as part of the conversion coatings family, which chemically modify the surface of metals to enhance their performance. Dacromet and Geomet are often specified for fasteners, automotive components, and industrial hardware where long-term corrosion resistance is required.
Key Characteristics
- Corrosion Protection: Both coatings provide a high degree of resistance to corrosion, particularly in harsh or outdoor environments.
- Thin Film: The coatings are applied in thin layers, which helps maintain dimensional tolerances on precision parts.
- Water-Based Application: The process uses water-based solutions, reducing volatile organic compound (VOC) emissions compared to some alternatives.
- Non-Electrolytic: Dacromet and Geomet coatings are applied without electricity, making them suitable for complex geometries and assemblies.
Typical Applications
- Automotive fasteners and components
- Industrial hardware and assemblies
- Construction and agricultural equipment parts
Process Steps
- Surface Preparation: The metal part is cleaned to remove oils, oxides, and contaminants.
- Coating Application: The Dacromet or Geomet solution is typically applied by dip-spin, spray, or dip-drain methods.
- Curing: The coated part is baked at controlled temperatures to cure the coating and bond it to the substrate.
Benefits and Considerations
- Uniform Coverage: Suitable for complex shapes and threaded components.
- Environmental Compliance: Water-based chemistry supports regulatory compliance for VOC emissions.
- Compatibility: Often used as an alternative to traditional hexavalent chromium coatings.
Dacromet and Geomet coatings are widely recognized for their performance in demanding environments, making them a standard choice in many North American manufacturing sectors.