Current label: Spiral duct
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The spiral air duct is easy to be corroded and rusted due to the chemical reaction of the iron sheet in various environments. However, zinc hardly changes in dry air. In humid air, dense basic zinc carbonate film will be formed on the surface of zinc. The spiral air duct is mainly coated with zinc on the iron sheet of the air duct to protect the iron sheet. After passivation treatment, dyeing or coating of light protecting agent on zinc coating
