What are the advantages of cold spraying zinc compared with hot spraying zinc?

At present, cold spraying zinc has become the main way to replace hot spraying zinc. Using cold spraying zinc with zinc cover instead of hot spraying zinc has obvious advantages, good anti-corrosion effect, simple construction, higher efficiency, environmental protection, safety and non-toxicity!

Anticorrosive performance

Hot spraying zinc: the zinc layer has rough surface and high porosity. Zinc metal is heated at high temperature (500℃) for a long time to produce a large number of oxides, and the existence of oxides weakens cathodic protection. The existence of cathodic protection is that the galvanized layer has better corrosion resistance than the general organic coating, and the galvanized layer with a film thickness of more than 80μ m can be protected in indoor atmospheric environment for more than 15 years.

Cold spraying zinc on zinc cover: represented by cold spraying zinc on zinc cover, the dry film contains more than 95% zinc. The cathodic protection and barrier protection of the coating are combined. Under the action of acid, alkali and salt in the atmosphere, the exposed layer can be transformed into dense zinc salt, which makes the coating have a unique triple protection effect. Zinc shield cold spraying zinc single coating (thickness 80μ m) can protect indoor atmospheric environment for up to 30 years. Combined with heavy anti-corrosion coating, the anti-corrosion life of composite three-coating system (film thickness 260μ m) can reach a higher life.

Architectural performance

Construction of thermal spraying zinc: thermal spraying zinc is to melt low-melting metal materials with a heat source and spray them on the surface of the substrate at a certain speed to form a coating.

Construction of cold spraying zinc on zinc cover: cold spraying zinc on zinc cover is just like painting, which can be brushed, rolled, gas sprayed and airless sprayed. Simple and efficient, without heating, the coating dries quickly and is not limited by the construction environment. Surface treatment adopts sand blasting, and there is no waste water discharge.