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In the fastener industry, surface treatment is not just about aesthetics—it plays a crucial role in corrosion resistance, durability, and overall performance. Choosing the right coating can extend the lifespan of fasteners and enhance their suitability for different applications. The three most common surface treatments are Hot-Dip Galvanizing, Dacromet, and Electroplating. As a trusted supplier of high-quality fasteners, Wuxi Zhuocheng Hardware is here to help you understand the differences and select the best solution for your needs.
1. Hot-Dip Galvanizing (HDG) – Superior Corrosion Resistance for Harsh Environments
Process Overview
Hot-dip galvanizing involves dipping fasteners into molten zinc at around 450°C (842°F), forming a thick zinc-iron alloy coating that provides excellent corrosion protection.
Advantages
✅ Exceptional Corrosion Resistance – Ideal for outdoor and marine environments, with a lifespan of 20+ years.
✅ Thick Zinc Coating – Typically 50–100μm, offering strong protection against mechanical damage.
✅ Best for Large Fasteners – Perfect for anchor bolts, expansion bolts, and structural fasteners.
Disadvantages
❌ Lower Dimensional Accuracy – Thick coatings can affect thread fit.
❌ Not Suitable for High-Strength Bolts – May cause hydrogen embrittlement in bolts above Grade 10.9.
2. Dacromet – The Best Choice for High-Strength Fasteners
Process Overview
Dacromet is a modern, water-based coating containing zinc and aluminum flakes, applied through dip-spin or spray methods, followed by high-temperature curing.
Advantages
✅ Outstanding Corrosion Resistance – A 4–8μm thin layer can withstand 600–1000 hours of salt spray testing.
✅ No Hydrogen Embrittlement – Ideal for Grade 8.8, 10.9, and 12.9 high-strength bolts.
✅ High-Temperature Resistance – Withstands 300°C (572°F) and above, unlike zinc coatings that degrade at 250°C (482°F).
Disadvantages
❌ Less Durable in High-Friction Applications – Thin coating wears off with frequent assembly/disassembly.
❌ Environmental Regulations – Some variations contain chromium, requiring compliance with environmental laws.
3. Electroplating – Cost-Effective for Indoor Applications
Process Overview
Electroplating deposits a thin layer of zinc onto fasteners using an electric current, followed by passivation (blue zinc, yellow zinc, black zinc, etc.) to enhance corrosion resistance.
Advantages
✅ Affordable and Cost-Effective – Ideal for mass production.
✅ Uniform and Aesthetic Finish – Preferred for precision screws and small fasteners.
✅ Available in Multiple Colors – Options like blue zinc, yellow zinc, and black zinc to match design requirements.
Disadvantages
❌ Lower Corrosion Resistance – Salt spray protection ranges from 48 to 200 hours, making it unsuitable for long-term outdoor use.
❌ Hydrogen Embrittlement Risk – Requires dehydrogenation treatment for high-strength fasteners to prevent breakage.
4. Choosing the Right Surface Treatment
✅ For long-lasting outdoor or marine use: Hot-Dip Galvanizing
✅ For high-strength fasteners that require anti-corrosion protection: Dacromet
✅ For cost-effective indoor applications: Electroplating
5. Wuxi Zhuocheng Hardware – Your Trusted Fastener Supplier
At Wuxi Zhuocheng Hardware, we provide high-quality fasteners with a variety of surface treatments, including hot-dip galvanizing, Dacromet, and electroplating, to meet diverse industrial requirements. Our products are widely used in construction, machinery, automotive, rail transportation, and more, ensuring reliability and durability.
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📩 Contact us for a quote or custom solutions: sales@zhuochengwj.com
Wuxi Zhuocheng Hardware – Your Fastener Expert for Safer, Stronger, and More Reliable Projects!
Wuxi Zhuocheng Mechanical Components Co., Ltd. is established in 1990, and one group of manufacturing and selling professional fastener
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