The Comparison between Geomet and Dacromet surface treatment technologies

The Comparison between Geomet and Dacromet surface treatment technologies

1. Composition & Process

Dacromet:
A non-electrolytic zinc coating technology. Its composition includes zinc flakes, aluminum flakes, chromic acid, and deionized water. The process involves dipping fasteners into a Dacromet solution, followed by drying and high-temperature curing to form a dense coating.

Geomet:
Also a non-electrolytic zinc-aluminum coating but uses zinc, aluminum, and organic resins. The coating is applied via spraying or dipping, followed by high-temperature curing.

2. Coating Characteristics

Dacromet:

Thicker coating (typically 5–10 μm).

Superior corrosion resistance, especially in harsh environments (high temperature, humidity, salt spray).

Silver-gray appearance.

Geomet:

Thinner coating (3–8 μm).

Slightly lower corrosion resistance than Dacromet but more environmentally friendly.

Offers customizable colors.

3. Environmental Impact

Dacromet:
Contains chromic acid, posing potential environmental risks. Restricted in some regions due to regulations (e.g., RoHS).

Geomet:
Chromium-free and eco-friendly, compliant with RoHS and other environmental standards.

4. Applications

Dacromet:
Used in automotive, marine, and infrastructure industries requiring high corrosion resistance.

Geomet:
Preferred for eco-sensitive applications (e.g., electronics, appliances).

5. Cost

Dacromet: Lower cost but less eco-friendly.

Geomet: Higher cost due to advanced environmental compliance.

Summary

Choose Dacromet for extreme corrosion resistance in non-eco-critical scenarios.

Opt for Geomet when balancing moderate corrosion resistance with environmental sustainability.

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