Testing Hot Dipped Galvanised Steel
30 November 2023
Through our collaboration with artists and material experts we have tested and experimented with the possibilities that hot-dipped galvanising can provide, to reveal a material finish which offers exceptional longevity and a unique visual appearance.
Unlike ‘applied’ finishes to metal, such as polyester powder coating (PPC), hot-dip galvanising creates a metallurgic reaction which effectively fuses the molten zinc to the base steel, and becomes integral to the steel. The primary benefit of this is to increase the corrosion resistance of the steel, but it also creates a highly unique visual finish, created by the ‘spangle’ of crystalised zinc that forms on the surface of the steel.
Our on-going collaboration with artist Antony Gormley furthered our material research into galvanising, in the form of a small workshop building which was entirely clad in galvanised steel, extending the artist’s existing studio facilities in London.
The use of hot dipped galvanised steel as a cladding material was chosen because of its ability to be both robust as well as create an intriguing aesthetic appearance. This was achieved through a rigorous research and prototyping process, with direct engagement with galvanising plants to understand how the process of hot dip galvanising could be controlled to achieve the desired precision of panel junctions and visual appearance.
To reach the desired material finish, each galvanising test refined the base steel specification and optimised the pre-folded form of the panel, so that the finished result yielded long lasting corrosion protection and an elemental, sculptural like quality to the finished building. Newly galvanised steel appears initially bright and reflective, but slowly softens as the surfaces oxidises, increasing its atmospheric resistance over time and mellowing into its setting. The research and development of this material technique has been applied to our project in Bethnal Green, which applies the same principles on a larger, city scale.