Cladding is an easy and economical method to design multifunctional aluminum structures with improved corrosion resistance, mechanical strength, and physical appearance. In this study, the electrochemical properties and corrosion behavior of an aluminum-clad product made of 7072/3004/7072 aluminum alloys were investigated by Tafel extrapolation and impedance spectroscopy. 3004 aluminum sheet was used as core, and it was cladded with 7072 aluminum sheets on both sides. The long-term corrosion behavior of clad samples was examined after being immersed in tap water, rainwater, and 3.5 wt.% NaCl solution for 4 weeks. The results show that because of the potential difference between 7072 and 3004 aluminum alloys, 7072 alloy behaves more anodic and corrodes preferentially (with a slower rate) compared to 3004 aluminum alloy. Cladding 3004 with embossed 7072 alloy improves the corrosion resistance of the alloy. Moreover, the electrolyte comparison demonstrates that the carbonate-forming ions (such as Ca) in tap water and HCO₃⁻, NO₃⁻, and SO₄²⁻ in rainwater decelerate the corrosion rate.

包层是设计具有改善的耐腐蚀性，机械强度和物理外观的多功能铝结构的一种简单经济的方法。在这项研究中，通过Tafel外推法和阻抗谱研究了由7072/3004/7072铝合金制成的覆铝制品的电化学性能和腐蚀行为。以3004铝板为芯，两面覆以7072铝板。将包层样品浸入自来水，雨水和3.5 wt。％NaCl溶液中4周后，检查其长期腐蚀行为。结果表明，由于7072和3004铝合金之间的电势差，与3004铝合金相比，7072合金表现出更多的阳极腐蚀和优先腐蚀（速率较慢）。具有压花7072合金的覆层3004提高了合金的耐腐蚀性。此外，电解质的比较表明自来水和HCO中形成碳酸根的离子（例如Ca）₃ ^-，NO ₃ ^-和SO ₄ ^2-中的雨水减速腐蚀速率。