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为了使热镀锌板在运输途中和短期存储中不生锈，常常是进行铬酸盐钝化处理。但是，这终究还是暂时的防腐措施，要想延长镀层的耐腐蚀寿命，

最根本的方法是增加镀层的重量（或称镀层的厚度）。在辊镀法热镀锌中，通过提高原板表面的粗糙度、降低锌液中的铝含量、提高锌液的温度、

选择助长合金层生长的原板化学成分，例如采用硅镇静钢镀锌等，都可以达到增厚镀层的目的。随着热镀锌板应用范围的不断扩大，

需要把热镀锌板涂漆和涂塑的场合逐渐增多，因而，对于这一部分热镀锌板必须提高它的涂装性能。提高热镀锌板涂装性能最经典的方法，

是在涂着前把热镀锌板进行磷化处理，实践证明，这种磷酸盐薄膜对涂漆和涂塑料来说，均是良好的底层。

Chromate is often blunt to prevent hot galvanized plates from rust in transit and in short-term storage.However, this is a temporary corrosion measure,

to extend the corrosion resistance life of the coating, the most fundamental method is to increase the weight of the coating (or the thickness of the coating).

In roller hot galvanizing, the purpose of thickening the coating can be achieved by improving the roughness of the surface of the original plate,

reducing the aluminum content of the zinc liquid, increasing the temperature of the chemical composition of the alloy layer,

such as the use of silicon sedative steel galvanizing.With the continuous expansion of the application scope of hot galvanized plate,

the need to paint and plastic hot galvanized plate is gradually increased, therefore, for this part of hot galvanized plate must improve its coating performance.

The most classic way to improve the coating performance of hot galvanized plate is to phosphate the hot galvanized plate before coating.

Practice has proved that this phosphate film is a good bottom layer for paint and plastic coating.