Galvanisert

Galvanisert is the Norwegian term used to describe iron or steel products that have been coated with zinc to protect against corrosion. The process, known in Norwegian as galvanisering, provides corrosion protection through sacrificial zinc and the formation of a protective patina over time.

There are several methods to apply a zinc coating. Hot-dip galvanizing is the most common method for structural and outdoor steel; parts are cleaned, fluxed, and dipped into molten zinc, forming several intermetallic layers and a durable outer zinc layer. Electrogalvanizing uses electrochemical deposition to apply a thinner, more uniform coating. Thermally sprayed zinc coatings are another option, where zinc is sprayed onto the surface to build up a protective layer.

Applications of galvanized steel are widespread. It is used in construction for structural members and fasteners, in piping and plumbing systems, in fencing and outdoor infrastructure, in agricultural equipment, and in various automotive and industrial components. The zinc coating provides a long service life with relatively low maintenance and can be repaired or touch-up coated if damaged.

Benefits include sacrificial protection (zinc corrodes before the underlying steel), good atmospheric corrosion resistance, and the ability to cover large or complex shapes. The material is also cost-effective when the expected service life is compared with other protective coatings, and it is recyclable.

Limitations include the potential for coating damage from bending, cutting, or heavy wear, which can expose the steel beneath. Damaged areas require re-coating to restore protection. In aggressive environments or at welds, coating thickness can be reduced, and white rust may form if galvanized parts are not dried properly.

Standards governing galvanization include ISO 1461 (hot-dip galvanizing of iron and steel) and EN 1461 in Europe, with related specifications such as ASTM A123/A123M in the United States.