Coating & Surface Treatments for Fasteners - Rajal Industries

Coating & Surface Treatments for Fasteners

Types of Coatings & Surface Treatments for Fasteners

Coating Type	Corrosion Resistance	Appearance	Thickness (µm)	Key Benefits	Common Applications
Zinc Plating (Electroplated Zinc)	☁️Medium (Indoor Use)	Shiny Silver/Yellow	5 - 15 µm	✅ Cost-effective, ✅ Protects against rust, ✅ Good for general use	Indoor, Automotive, Electrical, Furniture
Hot-Dip Galvanizing (HDG)	🌧High (Outdoor Use)	Matte Gray, Thick Coating	50 - 85 µm	✅ Best for outdoor & heavy-duty use, ✅ Prevents rust for decades	Construction, Bridges, Railways, Solar
Mechanical Galvanizing	🌧High (Outdoor Use)	Matte Silver/Gray	25 - 40 µm	✅ Alternative to HDG, ✅ Provides uniform coating, ✅ No risk of hydrogen embrittlement	Structural Fasteners, Heavy Machinery
Dacromet Coating (Zinc Flake Coating)	🌊Very High (Extreme Environments)	Matte Silver-Gray	8 - 12 µm	✅ High corrosion resistance, ✅ Chemical & heat resistant, ✅ No hydrogen embrittlement	Aerospace, Military, Wind Energy, Mining
Geomet Coating (Advanced Zinc Flake)	🌊Very High	Light Gray/Silver	7 - 10 µm	✅ Superior rust protection, ✅ Environmentally friendly (Chrome-free), ✅ Excellent adhesion	Automotive, Bridges, Marine, Wind Power
Black Oxide	☀️Low	Black	0.5 - 2 µm	✅ Increases wear resistance, ✅ Aesthetic finish, ✅ Reduces glare & friction	Tools, Firearms, Decorative Fasteners
Nickel Plating	☁️Medium	Shiny Silver	3 - 8 µm	✅ Improves hardness, ✅ Protects against wear & oxidation	Electronics, Automotive, Decorative Hardware
Teflon® Coating (PTFE)	🌊Very High (Chemical Resistance)	Multiple Colors	10 - 25 µm	✅ Non-stick, ✅ Excellent chemical resistance, ✅ Reduces friction	Oil & Gas, Food Processing, Medical
Phosphate Coating (Zinc or Manganese)	☁️Medium	Dark Gray/Black	5 - 10 µm	✅ Absorbs lubricants well, ✅ Reduces friction, ✅ Improves adhesion for paints	Automotive, Military, Engine Components
Powder Coating	☀️Low	Custom Colors	40 - 80 µm	✅ Decorative, ✅ Protects against minor corrosion	Architectural, Furniture, Outdoor Fixtures
Copper Plating	☀️Low	Reddish-Brown	1 - 5 µm	✅ Improves electrical conductivity, ✅ Prevents galling in stainless steel fasteners	Electrical, Marine, Decorative Fasteners
Brass Plating	☀️Low	Gold/Brass Look	1 - 3 µm	✅ Aesthetic appearance, ✅ Corrosion-resistant	Decorative Hardware, Electrical Connectors
Silver Plating	☀️Low	Bright Silver	3 - 6 µm	✅ High conductivity, ✅ Anti-seizing	Electrical, Aerospace, Precision Fasteners

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