The layered double hydroxides (LDHs) films are promising bioactive coatings for magnesium (Mg) alloys. Here, a film of composite LDHs has been prepared using a two-step in situ growth method on Mg–4Zn alloy. This film is found to provide excellent initial protection to the Mg–4Zn alloy in Hank’s solution. During long-term immersion, layers of corrosion products mainly consisting of Mg/Ca–PO₄^3-/HPO₄^2- are deposited on top of both the bare alloy and the LDHs film, which can enhance the barrier effect and produce a self-healing effect. As a result, filiform corrosion occurs on the substrate but corrosion is not particularly severe even after 12 days of immersion. In the case of the coated sample, except for local pit corrosion at several active places, most areas remain integral even after immersion for 18 days.

层状双氢氧化物 (LDH) 薄膜是用于镁 (Mg) 合金的有前途的生物活性涂层。在这里，使用两步原位生长方法在 Mg-4Zn 合金上制备了复合 LDHs 薄膜。发现该膜为汉克溶液中的 Mg-4Zn 合金提供了极好的初始保护。在长期浸泡过程中，主要由 Mg/Ca-PO ₄ ^3- /HPO ₄ ^2-组成的腐蚀产物层沉积在裸合金和 LDHs 膜的顶部，可以增强阻挡效应并产生自愈效应。结果，基材上发生丝状腐蚀，但即使在浸泡 12 天后腐蚀也不是特别严重。在涂层样品的情况下，除了几个活动位置的局部凹坑腐蚀外，大多数区域即使在浸泡 18 天后仍保持完整。