乐从钢材批发市场 锌铝镁镀层钢板是什么？为何能应用于汽车板上？ ...

锌铝镁镀层钢板是什么？为何能应用于汽车板上？

What is zinc aluminum magnesium coating steel plate? Why can it be applied to car boards?

简单来说，锌铝镁镀层钢板作为已广泛应用的热镀锌钢板的升级产品，其是通过在原热镀锌钢板镀层中加入适量的铝和镁元素制成的三元合金高耐蚀钢板。而采用锌铝镁镀层钢板生产的汽车车身在复杂恶劣的使用环境中具有更长的寿命。

In short, zinc aluminum magnesium plating steel plate has been a widely used hot dip galvanized steel plate upgrade product, which is made of ternary alloy high corrosion resistant steel plate by adding appropriate amount of aluminum and magnesium to the original hot dip galvanized steel plate plating. The automobile body produced by zinc, aluminum and magnesium coated steel plate has a longer life in the complex and harsh use environment.

目前这一技术主要应用于车身内板方面，长城汽车在自主品牌阵营中先人一步，联合首钢集团已完成锌铝镁钢板的成功开发并应用于车身组件之上，以2019款哈弗M6(国Ⅵ)车型为例，目前其全系车型在车门内板、机盖内板部分均已采用锌铝镁钢板。

At present this technology is mainly used in the body plate, the Great Wall ahead in the independent brand camp, joint shougang group has completed the successful development of zinc aluminum magnesium steel plate and applied to body components, in 2019 harvard M6 (countries) models, for example, the whole models in the door plate, cover plate parts have been adopted zinc aluminum magnesium plate.

锌铝镁镀层钢板为何具备高耐蚀性？

Why does the zinc, aluminum and magnesium coated steel plate have high corrosion resistance?

从原理角度来说，相比纯锌镀层钢板，锌铝镁镀层钢板镀层中的镁(Mg)成分在耐腐蚀性方面发挥了很大作用：在腐蚀初期，镁成分有利于促进生成状态非常稳定且组织缜密细致的水锌矿(Zn5(0H)8Cl2·H2O)保护膜，正是这一在镀层表面生成并维持膜状的覆盖层使得钢板拥有更优异的耐腐蚀性。而在腐蚀后期，铝(Al)元素也会起到一定的电化学保护作用，共同助力提升锌铝镁镀层钢板的耐腐蚀性。

From the perspective of principle, compared with pure zinc plating plate, zinc aluminum magnesium plating of magnesium (Mg) composition has played a great role in corrosion resistance: in the beginning of corrosion, magnesium composition is beneficial to promote the generation state is very stable and meticulous water zinc ore (Zn 5 (0H) 8Cl2 H2O) protective film, it is this on the coating surface generate and maintain the coating layer makes steel plate has more excellent corrosion resistance. In the late stage of corrosion, aluminum (Al) elements will also play a certain electrochemical protection role, jointly helping to improve the corrosion resistance of zinc, aluminum and magnesium coated steel plate.

在锌铝镁镀层钢板经过加工的切面部位，上部的镀层会发生溶解并逐步覆盖切面表面，促进状态稳定的保护膜的生成。在腐蚀发生的初期过程中，裸露在外的切面部位会发生红锈，而一旦水锌矿保护膜在切面形成膜状覆盖物，红锈就不再扩展，锌铝镁镀层将发挥其优异的耐蚀作用。

In the processed section part of the zinc aluminum magnesium plating plate, the upper plating layer will dissolve and gradually cover the section surface, promoting the formation of stable protective film. In the initial process of corrosion, red rust will occur in the exposed section, and once the protective film of the zinc ore forms a membrane cover in the section, the red rust will no longer expand, and the zinc aluminum magnesium coating will play its excellent corrosion resistance.

锌铝镁镀层钢板的高耐蚀性优势根据其在车身所应用的部位可以大致细分展现为切口耐蚀、平面耐蚀、漆膜耐蚀、电偶耐蚀等方面，对应着汽车车身腐蚀问题的方方面面，包括切口腐蚀、外观件膜下腐蚀、隐藏件穿孔等情形。

The high corrosion resistance advantages of zinc, aluminum and magnesium coated steel plates can be roughly subdivided according to the parts used in the car body into incision corrosion resistance, plane corrosion resistance, paint film corrosion resistance, electroeven corrosion resistance and other aspects, corresponding to all aspects of the corrosion problem of the automobile body, including incision corrosion, corrosion under the exterior film, perforation of hidden parts, etc.