鋅鋁鎂鍍層鋼板是什么？為何能應(yīng)用于汽車板上？

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

簡單來說，鋅鋁鎂鍍層鋼板作為已廣泛應(yīng)用的熱鍍鋅鋼板的升級產(chǎn)品，其是通過在原熱鍍鋅鋼板鍍層中加入適量的鋁和鎂元素制成的三元合金高耐蝕鋼板。而采用鋅鋁鎂鍍層鋼板生產(chǎn)的汽車車身在復(fù)雜惡劣的使用環(huán)境中具有更長的壽命。

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.

目前這一技術(shù)主要應(yīng)用于車身內(nèi)板方面，長城汽車在自主品牌陣營中先人一步，聯(lián)合首鋼集團(tuán)已完成鋅鋁鎂鋼板的成功開發(fā)并應(yīng)用于車身組件之上，以2019款哈弗M6(國Ⅵ)車型為例，目前其全系車型在車門內(nèi)板、機(jī)蓋內(nèi)板部分均已采用鋅鋁鎂鋼板。

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.

鋅鋁鎂鍍層鋼板為何具備高耐蝕性？

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

從原理角度來說，相比純鋅鍍層鋼板，鋅鋁鎂鍍層鋼板鍍層中的鎂(Mg)成分在耐腐蝕性方面發(fā)揮了很大作用：在腐蝕初期，鎂成分有利于促進(jìn)生成狀態(tài)非常穩(wěn)定且組織縝密細(xì)致的水鋅礦(Zn5(0H)8Cl2·H2O)保護(hù)膜，正是這一在鍍層表面生成并維持膜狀的覆蓋層使得鋼板擁有更優(yōu)異的耐腐蝕性。而在腐蝕后期，鋁(Al)元素也會起到一定的電化學(xué)保護(hù)作用，共同助力提升鋅鋁鎂鍍層鋼板的耐腐蝕性。

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.

在鋅鋁鎂鍍層鋼板經(jīng)過加工的切面部位，上部的鍍層會發(fā)生溶解并逐步覆蓋切面表面，促進(jìn)狀態(tài)穩(wěn)定的保護(hù)膜的生成。在腐蝕發(fā)生的初期過程中，裸露在外的切面部位會發(fā)生紅銹，而一旦水鋅礦保護(hù)膜在切面形成膜狀覆蓋物，紅銹就不再擴(kuò)展，鋅鋁鎂鍍層將發(fā)揮其優(yōu)異的耐蝕作用。

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.

鋅鋁鎂鍍層鋼板的高耐蝕性優(yōu)勢根據(jù)其在車身所應(yīng)用的部位可以大致細(xì)分展現(xiàn)為切口耐蝕、平面耐蝕、漆膜耐蝕、電偶耐蝕等方面，對應(yīng)著汽車車身腐蝕問題的方方面面，包括切口腐蝕、外觀件膜下腐蝕、隱藏件穿孔等情形。

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.