锌镀层在大气条件下对低合金钢管为阳极性镀层，经彩色钝化后，明显地提高了镀层的保护性能并改善了外观。主要用于防止低合金钢管的腐蚀，其镀层价格低廉，耐腐蚀性能优良，应用量大面广。锌是两性金属,比较活泼,在干燥少雨的大气中锌的腐蚀速度较慢。
Under the atmospheric condition, the zinc coating is an anodic coating on the low alloy steel tube. After the color passivation, the protective property of the coating is improved obviously and the appearance is improved. The utility model is mainly used for preventing the corrosion of the low alloy steel pipe, and the coating has the advantages of low price, excellent corrosion resistance and wide application. Zinc is a amphoteric metal, relatively lively, in the dry, less rain atmosphere, zinc corrosion rate is slower.
在潮湿的工业大气中它能与二氧化硫、二氧化碳、氧气、水等发生电化学腐蚀作用，人们通常看到的锌层表面的白霜就是镀锌层的腐蚀产物。镀锌层若与能挥发出某些腐蚀性有机气体的有机材料相接触时更将加速它的腐蚀。 镀锌层遭到腐蚀后不断变薄,这不仅使镀层外观受到破坏,甚至失去对低合金钢管基体的保护能力。若将镀锌层在一定组成的铬酸溶液中进行钝化处理,使镀锌层表面形成一层组织细密、抗蚀性较高的铬酸盐膜(即钝化膜)后,则可显著地提高镀锌层的抗腐蚀能力。

In the wet it can occur in industrial air and water etc. the role of electrochemical corrosion of sulfur dioxide, carbon dioxide, oxygen, corrosion products, people usually see the surface of the zinc layer of frost is galvanized layer. Zinc coating will accelerate its corrosion if it contacts with organic material which can produce some corrosive organic gas. The zinc coating is thinned after corrosion, which not only destroys the appearance of the coating, but also loses the protection ability of the low alloy steel tube matrix. If the galvanized passivation solution in chromic acid composition, so as to form a layer of chromate film fine microstructure and corrosion resistance, high galvanized layer surface (i.e. passivation film), can significantly improve the corrosion resistance of the galvanized layer.
低合金钢管经冷加工塑性变形可以提高其强度。在低合金钢管中能形成稳定化合物的合金元素，在一定条件下，使之生成的第二相化合物从固溶体中沉淀析出，弥散地分布在组织中，从而有效地提高材料的强度，通常析出的合金化合物是碳化物相。
Low alloy steel tube can increase its strength by cold working and plastic deformation. Alloy elements can form stable compounds in low alloy steel pipe, under certain conditions, the formation of the second phase from the solid solution and precipitation of dispersed in the organization, so as to effectively improve the strength of materials, alloy compounds usually precipitated carbide phase.
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