Difference between hot galvanized and hot-spraying zinc process

1.Hot dip galvanizing process pretreatment using pickling, phosphating process, the surface of the workpiece will have acid, lye residue, leaving the hidden danger of corrosion, so that the hot dip galvanized layer is easy to fall off; spray zinc, aluminum spray process Pretreatment adopts sandblasting process, so the surface of the workpiece is very clean and rough, the surface is sprayed with zinc, and no corrosion from inside to outside will occur after aluminum spraying, and thus no rust and peel off phenomenon will occur.

2.The hot dip galvanizing process has a certain temperature, about 440 °C or so, so the workpiece will be deformed after hot-dip plating; while spraying zinc, aluminum spraying process is very low temperature, the workpiece surface temperature <80 °C, so the workpiece will not Deformation.

3.The use of hot-dip galvanizing process, the workpiece by the plating tank length × width × height restrictions; while the use of zinc spray, aluminum spray process without restrictions on the workpiece.

4.The use of hot-dip galvanizing process, there are still on-site repair problems. On-site installation, weld, loading and unloading, transportation damage, repair can only use paint; such as using spray zinc, aluminum spray process, on-site repair.

5. As the pretreatment of hot-dip galvanizing process adopts pickling and phosphating, there is no roughness on the surface of the workpiece and the bond strength of the coating is poor; while the pretreatment of zinc spray and aluminum spray process adopts sandblasting, Sa ≥ 2.5 grade. Therefore, the surface roughness of the workpiece, the coating bonding force is better, tensile strength ≥ 0.6kgf/mm2.

6.The hot-dip galvanizing process is very serious for water pollution, and the environmental protection problem is very prominent. Therefore, the application of thermal spray zinc and aluminum spray technology is more and more widely used.

Aerospace

Thermal spraying began in the national defense and military industry in China and gradually developed into civilian products. So far, pre-protective coatings and repairs for missiles, rockets, satellites, tank parts and aero engine blades, fire hoses, missile slides, etc. coating.

Building decoration

Large-scale plastic sculpture, murals, spray brass, spray bronze, spray aluminum, spray stainless steel, spray colored plastic and other decorative coatings.