Thermal zinc spraying

Steel is strong, is easy to work, and is available in all sorts of different qualities. In fact, steel has only one drawback: it needs protection against corrosion.

Rotocoat has specialised for many years in the preservation of steel. In addition to hot-dip galvanising and powder coating of steel, Rotocoat also offers the thermal zinc spraying of steel according to NEN-EN-ISO 2063.

Thermal zinc spraying, flame spraying or metallising

Thermal zinc spraying, flame spraying or metallising are different terms for the same process: the thermal application (flame spraying) of liquid zinc onto blasted steel.

A zinc wire is melted inside of a heated application gun and then combustion gasses or compressed air is used to apply the zinc to the steel surface in one or more layers. This zinc layer immediately solidifies into a well-adhering protective layer. If damage does occur, a chemical reaction follows: ‘cathodic protection’, which prevents the steel from rusting. After the zinc spraying the object is provided with a powder coating or wet paint.

Very good adhesion

The adhesion of the zinc layer to the blasted surface is very good and ensures a long service life to the steel. The appearance of a zinc sprayed layer looks smooth. Zinc spraying does not bend the steel and offers more options for large dimensions.

When zinc spraying, the inside of steel profiles is difficult or impossible to treat and seams and cracks do not close. A zinc sprayed layer can therefore always be closed with a powder coating or wet paint.

Benefits of thermal zinc spraying

Durable

The adhesion of the zinc layer to the blasted surface is very good and ensures a long service life to the steel. If it does get damaged, a chemical reaction follows: 'cathodic protection" which prevents the product from rusting. A zinc sprayed layer can always be closed with a powder coating or wet paint.

Reliable

Rotocoat offers the thermal zinc spraying of steel according to NEN-EN-ISO 2063. This standard applies to metal layers of zinc, aluminium, and zinc and aluminium alloys, applied by thermal zinc spraying, for the protection of iron and steel against corrosion.

Repair and protect

Thermal zinc spraying is very suitable for performing local repairs. The advantage is that it is not necessary to completely strip the product or remove the zinc layer, but that it can be sandblasted and scraped locally. Afterwards the product can be recoated and the steel is sustainably protected again, which benefits the durability.

Good price-quality ratio

Thermal zinc spraying offers a good price-quality ratio and is particularly suitable for objects that do not fit in het zinc bath and objects that are sensitive to deformation during hot-dip galvanising, such as window frames.

Environmentally friendly

When a hot-dip galvanised product has been damaged, it can be repaired by means of thermal zinc spraying, so the products does not need to be replaced. After the thermal zinc spraying, the product can be recoated, which significantly extends the product life.