Medium Low Zn-al-mg Steel Company Canada

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Can Zn-al-mg Steel completely replace galvanized steel? 

Regarding this issue, comprehensive analysis believes that Zn-al-mg Steel, as a product of hot dip coating, are competitive in specific uses. It, like other products such as aluminum zinc silicon and aluminized silicon, can play a unique role in special applications. The development of Zn-al-mg Steel has made the continuous hot-dip coating products of steel strips more diversified. The hot-dip production process based on galvanizing has stronger vitality in the competition with processes such as batch hot-dip plating and electroplating, and can contribute to environmental protection and energy conservation. make greater contributions.

However, the complexity of the zinc-aluminum-magnesium coating structure causes a certain gap between theoretical analysis and actual production results. This is because in the actual production process, the tissue morphology is formed at a faster cooling rate, while the theoretical analysis is based on the structure in an equilibrium state with a slow cooling rate. In addition, differences in the viewpoints and experimental conditions of different researchers may also lead to inconsistent conclusions. Laboratory tests usually use solvent method immersion plating manual testing, which is somewhat different from the actual continuous production process. The three elements zinc, aluminum and magnesium have a large segregation phenomenon in the liquid state in the zinc pot, so the overall composition may not fully represent the local components, resulting in deviations in the local organization. In addition, during the cooling and solidification process of zinc-aluminum-magnesium alloy, the changes in the local structure are very complex and are greatly affected by the cooling rate. However, the cooling rate on the actual production line is variable, which also leads to inconsistency in the structure.

There are currently many studies on the corrosion resistance of zinc-aluminum-magnesium coatings. The corrosion resistance of zinc-aluminum-magnesium alloy coating under various conditions was studied through AC impedance method, salt spray test method and cyclic corrosion test method. There are several explanations for the improved corrosion resistance. One explanation is that adding magnesium to zinc-aluminum-magnesium alloys can reduce the intergranular corrosion rate and improve the corrosion resistance of the alloy. Another explanation is that the addition of magnesium can increase the electrode potential of the substrate, thereby reducing the corrosion current. At the same time, the addition of magnesium will also promote the generation of stable and dense corrosion products on the coating surface, further improving corrosion resistance. Another explanation is that the dissolved magnesium can lower the pH value at the cathode, inhibit the diffusion of oxygen, and react with zinc to form a protective film. There are still different views on the role of this dense layer of corrosion products.

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