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Steel roof truss structure under construction with lightweight steel galvanized framing.
Due to its unique metallurgical bond, a galvanized coating is incredibly tough, offering strong performance across multiple layers.
Image: Shutterstock. com.
Uses and applications for hot dip galvanized steel continue to evolve, and new markets are emerging all the time.”
Galvanizing is a corrosion protection process for steel, in which the steel is coated with zinc to prevent it from rusting. The process involves dipping cleaned iron or steel components into molten zinc( which is usually around 450 ° C). The most common method is hot-dip galvanizing, in which the parts are coated by submerging them into a bath of hot, molten zinc.
Image: Sperrin Gavanizers.
A series of zinc-iron alloy layers are formed by a metallurgical reaction between the iron and zinc, creating a strong bond between steel and the coating. Typical time of immersion is about four or five minutes, but it can be longer for heavy articles that have high thermal inertia or where the zinc is required to penetrate internal voids.
Upon withdrawal from the galvanizing bath, a layer of molten zinc will be deposited on top of the alloy layer. Often this cools to exhibit the bright shiny appearance associated with galvanized products.
“ Hot dip galvanizing is a cost-effective solution compared to other applications on the market, such as paint and electroplating. It is also environmentally friendly, with very little harm to the environment due to the durability it provides, resulting in fewer maintenance costs over the years,” commented the European General Galvanizers Association( EGGA).
Hot dip galvanizing
“ Hot dip galvanizing has been used worldwide for well over a century because it is low maintenance and can last a lifetime. Galvanizing steel creates a durable finish that protects against corrosion for much longer than coating alternatives such as paint. Whether it’ s beams, columns or other structural steel components, galvanizing is a trusted way of providing long-term, lowmaintenance protection against corrosion,” outlined UK galvanizer, Joseph Ash Galvanizing.
Due to its unique metallurgical bond, a galvanized coating is incredibly tough, offering strong performance across multiple layers. An initial outer layer provides reliability as a buffer zone, helping to absorb any initial shock to the coating.
Underlying zinc-iron alloys can be harder than mild steel itself and will further reduce any potential penetration of the coating or the exposure of bare steel. This means that a galvanized coating is highly chip-resistant and particularly suited to areas of high-frequency industrial wear.
“ Galvanizing has an abrasion resistance up to ten times better than organic paint coatings. The hot dip process is unique, producing a coating which is bonded metallurgically to the steel. As a result, galvanized steel has superior resistance to mechanical damage during handling, storage, transport and erection,” explained Highland Galvanizers in the UK.
Galvanized products, once constructed or installed, can also be removed, re-galvanized and re-used. They are also easily recycled with steel scrap in the steel production process. Galvanizing offers durability( a permanently bonded tough coating); long life( 70 yearsplus maintenance-free); value for money( low overall costs compared to other coatings) and a hygienic solution( easy-to-clean surface).
Spin galvanizing
Whilst hot dip galvanizing is used for large fabrications such as guardrails, spin galvanizing is used to protect small steel parts( such as hinges, bracketry, fasteners and fixings).
44 | ismr. net | ISMR May 2026