Shot-blasting is more commonly known as sand-blasting, and consists in continuously projecting small balls of steel at very high speed onto the surfaces requiring treatment.
Shot-blasting is used to prepare the surface for painting, by removing all signs of rust, carbon deposits, machining faults and grease – and creates the roughness required for better adherence of the future coating, whether liquid or powder.
This operation is defined by the ISO standard 8504/2/2000, which classifies the treated substrate according to 3 quality levels: Dsa 2, Dsa 2.5 and Dsa 3 according to the type of paint coating applied afterwards, and to the guarantees in place.
Metal plating through spray-applied zinc consists in melting the wire-form metal and spraying it using a flame spray gun (thermal spraying).
The zinc acts as a screen to block out external aggressive agents.
Thanks to its electro-chemical properties, the zinc impedes the steel’s oxidation process.