sinkkipäällystöissä

Sinkkipäällystöissä, often translated as zinc coating or galvanization, refers to a protective metal coating applied to steel or iron to prevent rusting. This process involves immersing the base metal in a bath of molten zinc. The zinc then forms a metallurgical bond with the iron or steel, creating a layered surface. The primary mechanism of protection is sacrificial, meaning that the zinc corrodes preferentially over the steel, sacrificing itself to keep the underlying metal intact. Even if the coating is scratched and the steel is exposed, the surrounding zinc will continue to protect the exposed area through galvanic action.

This method is widely used in construction, automotive manufacturing, and for everyday items like nails, screws, and fencing. The thickness of the zinc coating can be controlled, with thicker coatings offering longer-lasting protection, especially in corrosive environments. While galvanization is a robust method, the zinc coating can eventually be depleted over time depending on the environmental conditions. Different types of galvanizing processes exist, including hot-dip galvanizing, electrogalvanizing, and mechanical galvanizing, each offering varying degrees of protection and surface finish. The zinc coating can also be painted or powdered coated for additional aesthetic appeal and enhanced corrosion resistance.