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What is Spray Galvanizing?
Spray Galvanizing involves deposition of molten zinc or aluminium on to a prepared surface. The flame, atomized by compressed air and then projected on to the substrate which has been prepared.
Cold Process: There is no distortion on fabricated parts. Complicated structures like trusses, can be treated without fear of warpage.
Any Size or Shape: Unlike dipping, which is restricted by the size of the bath, in spraying the metal coated.
Site Jobs Possible: Spraying can be carried out at site, unlike in dipping, where the part has to be available.
Ideal Surface for Painting: Spraying leaves a rough surface which is excellent for painting applied often peels off.
Wide Range of Coating Thickness: Coating thickness can be accurately controlled from depending on the protection required.
Better Surface Preparation: Blasting, which is a prerequisite for spraying, removes all traces. Dripping, which is done after pickling, sometimes results in the link layer peeling off due to excess spraying.
Localized Repair Possible: On site repair can be carried out to damaged portions both at ground.
Pure Zinc Coating: Spraying assures a 99.95% pure zinc coating unlike in dipping where the coating by iron. This iron can get deposited on the job and acts as a corrosion accelerator.
No Hydrogen Embrittlement: Pickling which is necessary for dripping results in hydrogen litter the steel and the zinc causing embrittlement and making it unsafe for working loads.
Dross Embedment Avoided: In dripping, dross, which is present at the top of the molten zinc. This zinc resulting in peeling of the coating.
Excellent High Friction Grip: Spraying maintains the efficiency of friction grip bolts and ensures safety of the structure.