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Difference Between Galvanized & Dacromet for Hose Clamps

1. Basic Process

• Galvanized (Electro-galvanizing / Hot-dip galvanizing)

  A layer of zinc is coated on the surface of the hose clamp by electroplating or hot dipping. Forms a pure zinc or zinc-iron alloy layer.
• Dacromet (Zinc-aluminum flake coating)

  A kind of inorganic coating with flake zinc powder and aluminum powder as main materials, coated and cured at high temperature.

2. Corrosion Resistance

• Galvanized

  Ordinary corrosion resistance; salt spray resistance is usually 72–500 hours.
• Dacromet

  Excellent corrosion resistance; salt spray resistance can reach 500–2000 hours, 5–10 times that of galvanized.

3. Hydrogen Embrittlement

• Galvanized

  High risk of hydrogen embrittlement due to pickling and electroplating; easy to cause fracture of high-strength materials.
• Dacromet

  No hydrogen embrittlement; very suitable for high-strength hose clamps and vibration-resistant applications.

4. Heat Resistance

• Galvanized

  Poor heat resistance; easy to fail above 100–200°C.
• Dacromet

  Good heat resistance; stable at 250–300°C.

5. Appearance

• Galvanized

  Bright silver-white, can be passivated in color.
• Dacromet

  Matte silver-gray, uniform and soft, no bright color.

6. Cost & Application

• Galvanized

  Low cost; widely used for general-purpose hose clamps in normal environments.
• Dacromet

  High cost; used for high-end, anti-corrosion, anti-vibration, high-temperature scenes such as automotive, marine, engineering machinery.

Short Summary (for product description)

• Galvanized: Cost-effective, good appearance, for general use.

• Dacromet: Strong corrosion resistance, no hydrogen embrittlement, high temperature resistance, for heavy-duty and long-life applications.