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Hot-Dip Galvanizing is a process that forms a zinc coating by immersing steel or iron workpieces in molten zinc liquid. Suspension Galvanizing is a method in hot-dip galvanizing, usually used to process larger workpieces.
Process steps of hot-dip galvanizing
Pretreatment: The surface of the workpiece needs to be cleaned to remove grease, rust and other impurities. Common pretreatment methods include pickling, degreasing and water rinsing.
Plating aid: The pretreated workpiece needs to be immersed in a plating aid solution (such as zinc chloride and ammonium chloride solution) to enhance the adhesion of the zinc layer.
Hot-dip galvanizing: After the workpiece is suspended by a hanger, it is immersed in a molten zinc liquid at about 450°C. During this process, zinc and iron react to form a zinc-iron alloy layer.
Cooling and passivation: After the workpiece is removed from the zinc liquid, it is cooled to solidify the zinc coating. To prevent the zinc layer from oxidizing during storage and transportation, passivation treatment can also be performed.
Characteristics of hanging plating
Applicable to large workpieces: hanging plating is usually used for larger steel structures, such as steel beams, pipes, etc., because this method can handle large-volume workpieces without affecting the uniformity of the coating.
Uniform zinc layer thickness: hanging plating can ensure that the zinc layer thickness is consistent everywhere on the surface of the workpiece, effectively protecting the substrate from corrosion.
Good surface quality: The surface of the workpiece after pretreatment and plating treatment is smooth, and the zinc layer has strong adhesion.
Hot-dip galvanizing hanging plating is a common anti-corrosion treatment method, widely used in construction, transportation facilities, bridges, mechanical equipment and other fields.
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