Shot blasting
- thermally sprayed zinc - painting

The thermally sprayed zinc process is a flexible technique used to treat the steel construction surfaces, which are unsuited for hot-dip galvanizing, including steel constructions that are too large for the galvanizing bath as well as constructions manufactured of steel types unsuited for hot-dip galvanizing.

Before constructions are submitted to thermally sprayed zinc process, they are cleaned by means of shot blasting using steel grit or corundum, providing the steel with a rough surface to increase the adhesion, strength and life of the thermally sprayed zinc coating. Shot blasting is carried out under controlled conditions in a closed system that is subjected to thorough environmental control. Stainless steel and aluminium can also be shot blasted with advantage.

In the thermally sprayed zinc process, zinc is applied to the constructions by means of an arc, based on the same principle as the one used for spray painting.

The process takes place at 5500º C, however, the thermally sprayed zinc process requires physical access to the construction, which is a limitation compared to the hot-dip galvanizing process. On the other hand, the thermally sprayed zinc process allows a zinc coating to be applied in the desired thickness. In contrast to hot-dip galvanizing, no reaction occurs between the metals in the thermally sprayed zinc process, and thus no metallic adhesion between the zinc and steel.

After the thermally sprayed zinc process, the construction can be painted to improve the corrosion protection ability. The paint can be chosen based on desired colour codes and required categories of corrosion.

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