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Surface Treatments for Metals

Like timber, most metals can be simply left to age without intervention. Mild steel will need surface protection to prevent oxidisation and there are a few methods which can be employed which are both decorative and utilitarian.

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  • MethodThe component is dipped in a bath of molten zinc at 450°
  • Durabilitystrong and durable
  • Lifespanup to 50 years
  • MaintenanceNot
  • Recycledwidely
  • CommentsThis is a rough finish, requiring linishing for public use, careful attention to designing in drain points and design out acid traps

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Hot Dip Galvanising

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  • MethodA thin layer of free-flowing dry plastic powder is applied electrostatically to the surface of a metal element which is then ‘baked’ to cure the plastic into a tough plastic skin
  • Durabilitymoderately durability of 10 years however if damaged it would allow the substrate to corrode if it’s not galvanised
  • MaintenanceNot required
  • RecycledNo
  • CommentsOur powder coating is always a double coat system with a zinc rich primer and a second topcoat

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Powder Coating

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  • Methodthe component shot cleaned then sprayed with a molten metal spray
  • Durabilitymoderately durable after sealing
  • Lifespanup to 20 years
  • Maintenance Bronze will need waxing annually
  • Recycled widely
  • Comments This is often used as cost saving alternative to casting in casting in bronze

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Thermal Arc Spray

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  • Methodthe component is given an electroplate coat of Zinc
  • Durabilitymoderately durable if also powder coated
  • Lifespanup to 10 years
  • MaintenanceNot required
  • Recycledwidely
  • CommentsThis is often used as an alternative to hot dip galvanising as it will give a cleaner finish if powder coating. It does not offer any long-term protection to steel but provides a good base to coat.

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Zinc Plating or electro galvanising