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.

镀锌是在钢或铁上涂上一层保护性的锌层以防止生锈的过程。一种常见的方法是热浸镀锌，即把零件浸入熔融的锌液中，以达到镀锌的效果。

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.

尽管锌涂层抑制了底层钢材的腐蚀，但经过几十年的气候暴露，生锈是不可避免的。特别是当暴露在酸性条件下时。例如，尽管有锌涂层的保护作用，但波纹屋顶在几年内就开始退化了。

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.

济南厨房排烟管道

Exhaust pipe of Jinan kitchen

海洋和盐碱地环境也减少了镀锌铁的寿命。海水的高导电性增加了腐蚀的速度。主要是由于固体锌转化为可溶性的氯化锌，氯化锌被简单地洗掉了。镀锌框架就是一个例子在寒冷的环境中，道路上的盐分会导致更快的腐蚀速度，尽管它们比没有保护的钢铁更耐用。

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.

如果保持额外的措施，如油漆涂层和增加牺牲阳极，镀锌钢可以持续几十年。无盐环境中的腐蚀率主要是由于空气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.

管道镀锌或搭接镀锌是一种非常普遍的应用，全世界每年有数十万吨的镀锌钢产品。在发达国家，大多数大城市都有几家镀锌厂，许多钢铁制造项目都进行镀锌保护。这通常包括街道家具、建筑框架、阳台、露台、楼梯、梯子和走道。热浸镀锌钢也用于制造钢架，是钢结构的基本建筑材料。

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.