1. It’s proven
With a history that stretches back over 200 years, there are innumerable examples in many environments proving its performance.
In Dorset, a bridge at Lydlinch was constructed in 1944 to assist the flow of supplies during the D-Day landings. The Callender-Hamilton design was originally intended only to be a temporary bridge but is still in use 70 years after construction. An inspection of the bridge was conducted by Galvanizers Association in 1999 after 55 years service. This indicated that the galvanized steel was in excellent condition with no signs of rust on any members. It is anticipated that the coating will achieve a maintenance-free life of more than 100 years.
2. It’s honest
Due to the unique alloy growth that occurs when clean steel is immersed into molten zinc – the coating effectively becomes part of the steel – if it looks good on day one it will remain so for many many years to come.
3. It’s sustainable
The long-term durability provided by galvanizing is achieved at relatively low environmental burden in terms of energy and other globally relevant impacts.
Several studies have demonstrated the high economic and environmental costs associated with the repeated maintenance painting of steel structures. These burdens can be significantly reduced by an initial investment in long-term protection. Lack of attention to optimal corrosion protection can leave a damaging economic legacy of repeated maintenance costs.
In social housing projects, future maintenance costs will be borne by the local authorities. In public infrastructure projects, use of galvanized steel leads to lower maintenance budgets, releasing public funds for other purposes.
4. It’s tough
The unique nature of the galvanizing process – formation of a series of zinc-iron alloy layers – provides a tough and abrasion resistant coating.
5. It’s self healing
Zinc corrodes in preference to steel and sacrifices itself to protect the steel, hence hot dip galvanizing will provide this sacrificial action. The corrosion products from the zinc are deposited on the steel resealing it from the atmosphere and therefore stopping corrosion.
6. It offers complete coverage
The fact that steel is being dipped into a bath of molten zinc means that hot dip galvanizing can provide protection to al surfaces of the steel component.