White rust

White rust, also known as zinc oxide, is a corrosion phenomenon that mainly occurs on galvanized surfaces. Unlike conventional rust, which affects ferrous metals, white rust affects zinc surfaces, which are often used as a protective coating for steel.

This appearance of white rust manifests itself in the form of whitish to grey deposits on the surface of the galvanized material. It occurs when the zinc coating comes into contact with moisture and oxygen. As a result of chemical reactions, zinc oxide is formed, which is a porous, whitish substance. This process leads to the protective effect of the zinc coating being impaired.

White rust can occur in a number of ways, including improper storage, prolonged exposure to humid conditions or damage to the zinc coating. Although white rust is not as aggressive as conventional rust, it can still compromise the protective effect of the zinc coating and lead to a reduction in aesthetic quality.

Avoiding white rust requires careful handling and storage of galvanized materials, especially in humid conditions. The use of additional protective coatings or corrosion inhibitors can also help to reduce sensitivity to white rust. Regular inspection and, if necessary, repair of damaged zinc coatings is also important to minimize the formation of white rust and extend the life of the galvanized material.