Differences and comparisons in choosing the right surface treatment

Hot-dip galvanizing vs. Zinc flake

The difference between hot-dip galvanizing and zinc flake coating
To help you choose the right surface treatment, we’ve put together a clear comparison between two common options: hot-dip galvanizing (HDG) and zinc flake coating. These treatments differ in method, level of protection, appearance, and areas of use.

Application method

Hot-dip galvanizing (HDG)

  • The item is dipped into molten zinc (~450 °C)
  • Creates a metallurgical bond between zinc and steel
  • Provides a thick, durable zinc layer

 

Zinc flake coating

  • Thin-film coating applied by dipping, spraying, or centrifuging
  • Consists of zinc and aluminum flakes in a binder matrix
  • Cured in an oven (no metallurgical bond)

Corrosion protection

Appearance and surface finish

Hot-dip galvanizingarmförzinkning

  • Gray, matte, somewhat uneven

 

Zinc flake

  • Smooth and even surface, often silver or gray in color

Applications

Hot-dip galvanizing

  • Building and steel structures, fasteners
  • Building and steel structures, fasteners
  • When robustness, wear resistance, full coverage, and long service life are required

 

Zinc flake

  • Smaller fasteners (screws, nuts)
  • Automotive industry, electrical components
  • When a thin coating with high precision is needed

Advantages of hot-dip galvanizing

  • Mechanical durability: Thick zinc layer that withstands scratches, impacts, and tough handling
  • Long outdoor lifespan: Up to 100 years of rust protection; the best choice in industrial and marine environments
  • Full coverage: Penetrates hard-to-reach cavities and edges, as well as inside pipes
  • Self-healing effect: If the zinc layer is damaged, the zinc sacrifices itself for the more noble steel
  • Most cost-effective from a life-cycle perspective

Advantages of zinc flake

  • Thin, precise coating: Perfect for small parts that require accurate fitting
  • Aesthetic finish: Smooth, decorative surface that can be customized

Summary table

Conclusion

  • Hot-dip galvanizing is the best choice when you need long-lasting, robust rust protection for any structures in tough environments.
  • Zinc flake coating is excellent for smaller components where high precision and a smooth surface are essential.tmärkt för mindre komponenter där hög precision och jämn yta är avgörande.