ZAM Solar Photovoltaic

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At present, there are many studies on the corrosion resistance of Zn-Al-Mg coating alloys. For the research on the corrosion resistance of Zn-Al-Mg alloys, most of them use the AC impedance method, salt spray test method, or cyclic corrosion test method close to practical conditions (cycle test under set salt spray, dry, and wet conditions), Under long-term atmospheric corrosion and closed corrosion environment, the corrosion products on the surface of the coating and the changes in the structure of the coating were studied. There are mainly the following explanations for the reasons for the improved corrosion resistance of Zn-Al-Mg.

1) Adding magnesium to the zinc bath can reduce the intergranular corrosion rate and improve the corrosion resistance of the coating. This explanation is mainly for the low content of Mg added in the alloy (Mg<0.2%), and Mg can refine the grains and strengthen the grain boundaries.

2) Increase the electrode potential of the substrate. The addition of magnesium can positively shift the corrosion potential of the zinc-based alloy and decrease the corrosion current significantly. Some researchers also believe that after adding Mg to the Zn-Al coating alloy, the corrosion potential does not change much, but the AC impedance increases and the double-layer capacitance of the electrode decreases, that is, the corrosion reaction is delayed, thereby improving the electrochemical corrosion resistance of the coating.

3) The addition of Mg promotes the formation of stable and dense corrosion products on the surface of the coating, which improves the corrosion resistance of the coating. This dense corrosion product inhibits the diffusion of oxygen, so the corrosion resistance is improved. However, there are different views on this layer of dense corrosion products.

4) Buffer effect after Mg dissolution. After Mg dissolves, it can reduce the pH value of the cathode, hinder the formation of ZnO, and inhibit the reduction of oxygen. Many researchers believe that it has more protective properties than basic zinc carbonate.

It can be seen from the above that the excellent corrosion resistance of the Zn-Al-Mg coating is unanimously recognized, and the mechanism for the improvement of the corrosion resistance of the Zn-Al-Mg alloy may be a combination of various mechanisms, not only depending on one corrosion mechanism. Therefore, it is widely used in aquaculture, seaside villa construction, etc.

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