When metal is exposed to its environment, it can react with moisture, chemicals and other agents, which may result in corrosion. Over time, this degrades both the appearance and the mechanical performance of the component. Applying a zinc coating creates a protective layer that helps to maintain the integrity and service life of the underlying substrate, particularly for steel and other ferrous metals.
Zinc and zinc nickel coating
Zinc is widely recognised as one of the most effective materials for corrosion control. Coatings of zinc in its pure form and as an alloy in zinc nickel coating form a dense, tightly adherent barrier between the metal and the environment, which slows down corrosive attack. The application of these coatings is a highly specialised process that in the UK is offered by a relatively small number of companies, including https://www.poeton.co.uk/surface-treatments/plating/zinc-nickel-plating/
Protective properties of zinc and zinc nickel coating
In addition, zinc provides two key methods of protection. First, it offers sacrificial protection, whereby the coating corrodes instead of the base metal. Second, as an electro-positive metal, zinc provides cathodic protection, thereby reducing the corrosion rate of any exposed steel and consequently extending the life of components.
These protective properties translate into several practical benefits. Zinc coatings resist the formation of rust, even in demanding service conditions. They also help to prevent underfilm corrosion – which occurs between a damaged coating and the coated surface – and minimise crevice corrosion in joints or complex geometries.
Overall, zinc coatings provide a robust, long-lasting defence against environmental attack.
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