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Why do the exhaust pipes of restaurants need to be galvanized? In short, this is for better ventilation performance and better extension of the service life of the pipeline. Considering that the ventilation pipeline may be exposed to various corrosive liquids, the work of galvanizing is relatively important.

鍍鋅是在鋼或鐵上涂上一層保護性的鋅層以防止生銹的過程。一種常見的方法是熱浸鍍鋅，即把零件浸入熔融的鋅液中，以達到鍍鋅的效果。

Galvanizing is the process of coating steel or iron with a protective layer of zinc to prevent rust. A common method is hot-dip galvanizing, that is, the parts are immersed in molten zinc to achieve the effect of galvanizing.

盡管鋅涂層抑制了底層鋼材的腐蝕，但經過幾十年的氣候暴露，生銹是不可避免的。特別是當暴露在酸性條件下時。例如，盡管有鋅涂層的保護作用，但波紋屋頂在幾年內就開始退化了。

Although the zinc coating inhibits the corrosion of the underlying steel, rust is inevitable after decades of climate exposure. Especially when exposed to acidic conditions. For example, corrugated roofs began to degrade within a few years, despite the protective effect of zinc coating.

濟南廚房排煙管道

Exhaust pipe of Jinan kitchen

海洋和鹽堿地環境也減少了鍍鋅鐵的壽命。海水的高導電性增加了腐蝕的速度。主要是由于固體鋅轉化為可溶性的氯化鋅，氯化鋅被簡單地洗掉了。鍍鋅框架就是一個例子在寒冷的環境中，道路上的鹽分會導致更快的腐蝕速度，盡管它們比沒有保護的鋼鐵更耐用。

Marine and saline environments also reduce the life of galvanized iron. The high conductivity of seawater increases the rate of corrosion. This is mainly due to the transformation of solid zinc into soluble zinc chloride, which is simply washed away. Galvanized frames are an example. In cold environments, salt on the road can lead to faster corrosion rates, although they are more durable than unprotected steel.

如果保持額外的措施，如油漆涂層和增加犧牲陽極，鍍鋅鋼可以持續幾十年。無鹽環境中的腐蝕率主要是由于空氣中的二氧化硫含量造成的。

If additional measures such as paint coating and sacrificial anodes are maintained, galvanized steel can last for decades. The corrosion rate in salt free environment is mainly caused by the content of sulfur dioxide in the air.

管道鍍鋅或搭接鍍鋅是一種非常普遍的應用，全世界每年有數十萬噸的鍍鋅鋼產品。在發達國家，大多數大城市都有幾家鍍鋅廠，許多鋼鐵制造項目都進行鍍鋅保護。這通常包括街道家具、建筑框架、陽臺、露臺、樓梯、梯子和走道。熱浸鍍鋅鋼也用于制造鋼架，是鋼結構的基本建筑材料。

Pipe galvanizing or lap galvanizing is a very common application, hundreds of thousands of tons of galvanized steel products are produced every year all over the world. In developed countries, most big cities have several galvanizing plants, and many steel manufacturing projects are protected by galvanizing. This usually includes street furniture, building frames, balconies, balconies, stairs, ladders and aisles. Hot dip galvanized steel is also used to make steel frame, which is the basic building material of steel structure.