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Zinc Flake Coating Brands Compared: GEOMET coatings, Magni, Zintek & Delta-Protekt
Introduction
Selecting the right corrosion protection system is one of the most important decisions for manufacturers producing automotive fasteners, industrial hardware, and engineered assemblies. Among GEOMET coatings, Magni, Zintek & Delta-Protekt tyoe modern options, zinc flake coatings have become the preferred choice for applications requiring superior corrosion resistance, controlled friction, and environmental compliance.
But “zinc flake coating” is not a single product. It is a family of chromium-free technologies supplied under several well-known brand names — most notably GEOMET coatings, Magni, Zintek, and Delta-Protekt — with the older DACROMET system still referenced on legacy drawings.
Although these systems look similar, they differ in chemistry, chromium content, OEM approvals, salt spray performance, and how they are applied. This guide compares the leading zinc flake coating brands so engineers, OEMs, and procurement teams can choose the right system for their application.
What Is a Zinc Flake Coating?
A zinc flake coating is a non-electrolytic corrosion protection system made of microscopic zinc and aluminium flakes suspended in an inorganic binder. The coating is applied by dip-spin or spray and then heat-cured. During curing, the overlapping flakes form thin, protective layers that shield the steel substrate from moisture, oxygen, road salts, and corrosive chemicals.
Because no electric current is used, zinc flake coatings do not cause hydrogen embrittlement during application — making them ideal for high-strength fasteners and safety-critical parts. Typical benefits include:
- High corrosion resistance (often 1,000+ hours salt spray)
- Chromium-free, environmentally compliant chemistry
- Thin coating (typically 5–20 µm) with excellent thread fit
- Controlled coefficient of friction for reliable torque
- No hydrogen embrittlement
The Major Zinc Flake Coating Brands
There are four internationally recognised suppliers of licensed zinc flake coatings. Applicators such as Aum Dacro Coatings apply these systems under license to meet specific OEM approvals.
GEOMET coatings(NOF Metal Coatings, Japan)
GEOMET is the chromium-free successor to DACROMET, developed by NOF Metal Coatings. It is one of the most widely specified zinc flake systems worldwide, valued for its water-based chemistry, thin build, and strong corrosion protection. Common grades include GEOMET 321, 500, and 720, often paired with a PLUS topcoat to fine-tune friction or colour. GEOMET routinely delivers 1,000+ hours of salt spray resistance.
Magni (Magni Group, USA)
Magni systems are multi-layer (duplex) coatings that combine an inorganic zinc-rich basecoat with an organic or aluminium-rich topcoat. Magni 565 is regarded as an industry “gold standard,” approved on the specifications of 30+ automotive and commercial-vehicle OEMs. Magni coatings are known for excellent chemical/fuel resistance and precise friction control on threaded fasteners.
Delta-Protekt / Delta-Tone (Dörken, Germany)
Delta-Protekt and Delta-Tone are the flagship zinc flake systems from Dörken (often written “Doerken”), typically combined with Delta-Seal topcoats. Dörken has produced zinc flake coatings since the 1980s, and the system is one of the most frequently specified in the German automotive industry. High-end configurations such as Delta-Protekt KL120 can exceed 2,000 hours of salt spray protection without white rust.
Zintek (Atotech, Germany)
Zintek is the zinc flake coating system from Atotech, usually paired with Techseal topcoats. It offers chromium-free corrosion protection comparable to the other major brands and is widely used across automotive and industrial fasteners.
Zintek vs “Zintec”: These are often confused. Zintek is a zinc flake coating (Atotech). Zintec is a different product entirely — electro-galvanized sheet steel with a thin electrolytic zinc layer. If your drawing calls for corrosion-protected fasteners, the intended product is almost always the zinc flake coating, Zintek.
DACROMET (NOF) — the legacy system
DACROMET was one of the earliest zinc flake technologies. Traditional DACROMET formulations relied on hexavalent chromium (Cr VI) for adhesion and corrosion resistance. Because of REACH, RoHS, and ELV restrictions, DACROMET has been largely superseded by chromium-free systems like GEOMET. Many older drawings still say “DACROMET” when a modern chromium-free zinc flake coating is actually intended.
How Zinc Flake Coatings Are Applied
Although brand chemistries differ, the application sequence is broadly similar:
- Surface cleaning and degreasing
- Shot blasting or chemical pretreatment
- Dip-spin or spray application of the basecoat
- Flash-off drying and controlled curing
- Topcoat application (for duplex systems), then a second cure
- Thickness inspection and friction testing
- Salt spray validation and quality inspection
Because zinc is not deposited electrically, hydrogen embrittlement risk is eliminated during coating.
Chromium-Free vs Chromium-Containing
| Property | GEOMET | Magni | Zintek | Delta-Protekt | DACROMET (legacy) |
|---|---|---|---|---|---|
| Hexavalent chromium | No | No | No | No | Yes |
| REACH / RoHS / ELV compliant | Yes | Yes | Yes | Yes | No |
| Worker safety | Excellent | Excellent | Excellent | Excellent | Limited |
For manufacturers supplying global OEMs, chromium-free zinc flake coatings are now the default choice.
Salt Spray Performance Comparison
Salt spray testing per ASTM B117 and ISO 9227 provides an accelerated benchmark for corrosion resistance.
| Brand | Typical time to red rust (ISO 9227 NSS) |
|---|---|
| DACROMET (legacy) | ~720 hrs |
| GEOMET (eg Geomet 720) | up to 1500+ hrs |
| Magni (e.g. 565 duplex) | 720+ hrs |
| Zintek | 720+ hrs |
| Delta-Protekt (premium, e.g. KL120) | 1,000+ hrs |
Salt spray hours are a useful comparison tool, but real-world durability also depends on layer structure, geometry, and application quality.
Automotive & Fastener Applications
The automotive industry relies heavily on zinc flake coatings because of strict corrosion requirements and the need for consistent torque. Typical applications include chassis fasteners, engine bolts, brake components, suspension systems, battery enclosures, and EV structural parts.
Zinc flake coatings are preferred for fasteners because they offer thin coating thickness, excellent thread fit, controlled friction, no hydrogen embrittlement, and reliable torque characteristics.
Brand Comparison Summary
| Feature | GEOMET | Magni | Zintek | Delta-Protekt |
|---|---|---|---|---|
| Supplier | NOF (Japan) | Magni Group (USA) | Atotech (Germany) | Dörken (Germany) |
| Base + topcoat | GEOMET + PLUS | Duplex (basecoat + topcoat) | Zintek + Techseal | Delta-Protekt + Delta-Seal |
| Chromium-free | Yes | Yes | Yes | Yes |
| Salt spray | 1500+ hrs | 720+ hrs | 720+ hrs | 1,000+ hrs |
| Known for | Thin water-based system | Broad OEM approvals | Reliable all-rounder | German automotive standard |
Which Zinc Flake Coating Should You Choose?
The right system depends on the OEM specification, environment, and performance requirement:
- Follow the drawing first. If an OEM specifies GEOMET 720, Magni 565, or Delta-Protekt KL120 by name, that specification governs.
- Choose a premium multi-layer system (e.g.Geomet 720) when you need maximum salt spray life or defined friction windows.
- Move away from DACROMET for any new program, due to chromium restrictions.
Because performance depends heavily on application quality, the applicator matters as much as the brand.
Frequently Asked Questions
Is GEOMET better than DACROMET?
For new programs, yes. GEOMET is chromium-free, better for worker safety and environmental compliance, and offers higher corrosion resistance than traditional DACROMET.
What is the difference between GEOMET and zinc flake coating?
GEOMET is one brand of zinc flake coating. “Zinc flake coating” is the broader category that also includes Magni, Zintek, and Delta-Protekt.
Which zinc flake brand gives the best corrosion resistance?
Premium multi-layer systems such as Geomet 720 can exceed 2,000 hours of salt spray. Actual performance depends on layer build and application.
Are zinc flake coatings environmentally friendly
The modern brands (GEOMET, Magni, Zintek, Delta-Protekt) are chromium-free and compliant with REACH, RoHS, and ELV.
Is Zintek the same as Zintec?
No. Zintek is a zinc flake coating (Atotech). Zintec is electro-galvanized sheet steel — a different product.
Conclusion
As industries demand greater durability and environmental compliance, chromium-free zinc flake coatings — GEOMET, Magni, Zintek, and Delta-Protekt — have replaced traditional DACROMET across automotive, renewable energy, and heavy engineering applications.
At Aum Dacro Coatings, we apply the leading licensed zinc flake coating systems to meet stringent OEM specifications and international quality standards. Whether your drawing calls for GEOMET, Zintek, or a Dörken Delta-Protekt system, our team delivers consistent quality, technical expertise, and reliable corrosion protection.
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