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一钢铁在空气、水或土壤中很容易生锈,为了防止钢铁生锈,在钢铁表面上涂复保护层的方法是普遍采用的一种方法,而镀锌又是其中之一。锌是一种兰白色的金属,熔点419.4℃,沸点为905℃,常温时比重为7.14克/厘米~3,熔点时比重为6.84克/厘米~3,锌具有中等延展性。室温下,锌在干燥的空气中不起变化,在潮湿的空气中锌表面则生成一层很致密的碱式碳酸锌薄膜,它能保护锌内部不再受腐蚀,它的价值也较便宜,用锌层保护钢铁成本低,因此广泛采用。
A steel is prone to rusting in the air, water or soil. In order to prevent rusting of the steel, a method of applying a protective coating on the surface of the steel is one commonly used method, and galvanizing is one of them. Zinc is a blue white metal, melting point 419.4 ℃, the boiling point of 905 ℃, room temperature, the proportion of 7.14 g / cm3, the melting point of 6.84 g / cm3, zinc has a medium ductility. At room temperature, zinc in the dry air can not afford to change in the humid air, the zinc surface is the formation of a very dense layer of basic zinc carbonate film, it can protect the internal zinc from corrosion, it is also cheaper value, With zinc layer to protect the low cost of steel, it is widely used.