螺旋风管的种类：
Type of spiral duct:
螺旋风管市场上按材质一般分为三类：镀锌螺旋风管、不锈钢螺旋风管以及复合螺旋风管。其中，不锈钢风管质量最好，适用性强，但价格高。目前市场上流通最广的螺旋风管是镀锌板的。镀锌板螺旋风管，基本是不锈钢螺旋风管的特性，但是价格相对只有不锈钢风管的三分之二甚至更低。复合螺旋风管一般应用在外界环境较为普通，对风管要求不太高的场所。特点由于铁皮容易在各种环境下发生化学反应，造成腐蚀、生锈。而锌在干燥的空气中几乎不发生变化。在潮湿的空气中，锌表面会生成致密的碱式碳酸锌膜。螺旋风管主要是在风管铁皮上北京纯水设备 保定网站制作 排水槽模具镀上一层锌，对铁皮起到保护的作用。锌镀层经钝化处理、染色或涂覆护光剂后，能显著提高其防护性和装饰性。
Spiral air ducts are generally divided into three categories according to materials in the market: galvanized spiral air ducts, stainless steel spiral air ducts and composite spiral air ducts. Among them, the stainless steel air duct has the best quality and strong applicability, but the price is high. At present, the most widely circulated spiral air duct in the market is galvanized sheet. Galvanized sheet spiral air duct is basically the characteristic of stainless steel spiral air duct, but the price is only two-thirds or even lower than that of stainless steel air duct. Composite spiral air duct is generally used in places where the external environment is common and the requirements for air duct are not too high. Features as the iron sheet is easy to react in various environments, causing corrosion and rust. However, zinc hardly changes in dry air. In humid air, a dense alkaline zinc carbonate film will be formed on the surface of zinc. Spiral air duct is mainly coated with a layer of zinc on the iron sheet of air duct to protect the iron sheet. The protective and decorative properties of zinc coating can be significantly improved after passivation, dyeing or coating with light protecting agen