Why Is Dacromet Coating Becoming the Global Standard for High-Performance Fasteners?

In modern industrial applications, protecting metal from the relentless threat of corrosion is a top priority. DACROMET (professionally known as Zinc Flake Coating) has emerged as a premier surface treatment technology, favored by engineers and procurement specialists for its exceptional durability and eco-friendly profile.
At Meigesi Fastener, we have integrated this advanced process into our core production line. We currently supply a wide range of Dacromet-coated screws and bolts, with full customization capabilities to support your unique project needs.

What Exactly Is Dacromet Surface Technology?

Dacromet is a non-electrolytic coating technology that forms a powerful protective film composed of zinc flakes, aluminum flakes, and a specialized binder. This coating bonds chemically with the metal substrate to create a dense, overlapping barrier that effectively shields the metal from oxidation.

How Does Dacromet Eliminate the Risk of "Hydrogen Embrittlement"?

For the fastener industry, Hydrogen Embrittlement has long been a critical failure point. Traditional electro-galvanizing requires acid pickling and electrolysis, which forces hydrogen ions into the metal matrix. This often leads to the sudden, catastrophic snapping of high-strength bolts under load.

Because the Dacromet process involves no electrolysis or acid pickling, it inherently prevents hydrogen embrittlement. This makes it the mandatory surface treatment for Grade 10.9, 12.9, and higher high-strength bolts.

What Are the Key Advantages of Using Dacromet Coating?

1. Superior Corrosion Resistance: Despite a thin coating thickness (only 4-8 μm), Dacromet provides 7 to 10 times the protection of traditional galvanizing, easily exceeding 1,000 hours in neutral salt spray tests.
2. Zero Hydrogen Embrittlement: Since it is a non-electrolytic process, it is the safest choice for critical load-bearing components.
3. Outstanding Thermal Stability: The coating remains intact and protective at temperatures up to 300°C, ideal for engine compartments or industrial heating systems.
4. Eco-Friendly Engineering: Dacromet is a "green" technology. The closed-loop process minimizes wastewater and harmful emissions compared to traditional plating methods.
5. Uniform Coverage in Complex Geometries: Utilizing dip-spin or spray methods, the coating flows into deep holes, fine threads, and blind recesses, ensuring total protection without the "shadowing effect" seen in electroplating.

In Which Industries Is Dacromet Most Effectively Used?

Automotive Industry: Essential for brake systems, chassis bolts, and high-tensile engine fasteners.

1. Construction Engineering: The preferred choice for bridges, steel structures, and heavy-duty infrastructure requiring long-term reliability.
2. Marine Engineering: Provides a robust defense against the high salinity and humidity of offshore environments.
3. Renewable Energy: Increasingly used in wind turbines and solar racking systems for its maintenance-free longevity.

Which Dacromet Products Does Meigesi Fastener Offer?

Dacrotized Self-Tapping Screw For Sandwich Panels - Meigesi

Torx Drive Pan Round Head Self Drilling Screw Dacrotized - Meigesi

Customized Concrete Bolts: All of our heavy-duty anchoring series can be finished with Dacromet to ensure structural integrity in harsh environments.