How is patina formed? Çantısan
25 Kasım 2022

Depending on the gases contained in the air it comes into contact with, the climate and the location of the building, the light gray colored patina forms within 6 months to 2 years. Patina on the zinc surface is a natural reaction to basic constituents in the atmosphere, where water is also present. It consists of two stages:


– When zinc comes into contact with water (moisture, H2O), it reacts with oxygen, forming a “zinc hydroxide” layer on the surface.
– Zinc hydroxide reacts with the carbon dioxide (CO2) in the air and the patina itself forms the “hydroxy carbonate” layer. The patina is tightly bound to zinc, its texture is natural and durable, and it does not dissolve in water. Therefore, it protects the zinc and slows down the interaction of the air in the atmosphere with the substances it contains.


Longevity Zinc is naturally resistant to corrosion but also self-protects by developing a patina that provides exceptional longevity. Due to 1 µm/year atmospheric corrosion, 0.70 mm thick rolled zinc will live for 70 years under minimum conditions and even 120 years depending on the environment. It is described as the material of the future, due to its long service life and no need for maintenance and repair.

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