Galvaniserte

Galvaniserte is the Norwegian term for metal parts that have been coated with zinc to protect them from corrosion. The coating is typically applied to steel or iron, producing galvaniserte components used to extend service life in outdoor or humid environments.

Two main methods exist: hot-dip galvanizing (HDG) and electrogalvanizing (EG). In HDG, parts are cleaned, fluxed, and immersed in molten zinc, creating a zinc coating bonded to a zinc-iron alloy. EG deposits zinc electrochemically with a thinner coating. Coating thickness depends on method and application and provides sacrificial protection for steel.

Benefits include improved corrosion resistance and long service life with minimal maintenance. Limitations involve potential damage from impact or bending; if the zinc layer is breached, protection decreases and repairs typically require recoating. The protective effect is most effective while the zinc remains intact.

Applications include construction components, fasteners, fencing, piping, and outdoor hardware in automotive, agriculture, and infrastructure sectors.

Standards governing galvanising include ISO 1461 and EN 1461 for hot-dip galvanizing, and ASTM A123/A123M. These specify coating thickness, adhesion, and corrosion resistance. Choice between HDG and EG depends on required thickness, environment, and cost.

History: The practice emerged in the 19th century and has since become a common method to protect steel from rust worldwide.