Kylmägalvanoinnin

Kylmägalvanointi, known in English as cold galvanizing, is a process used to apply a zinc coating to metal surfaces. Unlike hot-dip galvanizing, which involves immersing the entire object in molten zinc, cold galvanizing is typically applied at ambient temperatures. This is often achieved through the use of zinc-rich paints or coatings that contain a high percentage of zinc dust. When these coatings are applied to a prepared steel surface, they can provide a sacrificial layer of protection. This means that if the coating is scratched or damaged, the zinc will corrode preferentially, sacrificing itself to protect the underlying steel from rust.

The primary benefit of cold galvanizing is its simplicity and suitability for on-site applications where hot-dip galvanizing is impractical. It can be applied to structures that are already erected or to areas that have been damaged after initial galvanizing. The process typically involves cleaning the metal surface thoroughly to remove rust, scale, and contaminants, followed by the application of the zinc-rich coating, often by brushing or spraying. While not as thick or as long-lasting as hot-dip galvanizing, cold galvanizing offers a cost-effective method for corrosion protection, especially for smaller repairs or less demanding environments. The effectiveness of cold galvanizing depends on the quality of the coating, the preparation of the surface, and the environmental conditions it is exposed to.