The search for new alternatives to replace chromate-based coatings is a matter of great importance. Since their official ban due to the raised concerns of hexavalent chromium to the human health and the environment, significant efforts have been devoted to finding a more suitable alternative for the corrosion protection of aluminum alloys. However, the task has been quite challenging since the potential replacement needs to fulfill several requirements both in terms of cost and exceptional corrosion performance. Layered double hydroxides (LDHs) have generated a lot of interest in the past few years. They have been proposed as prospective candidates to replace chromate based protective systems. The particular structure of LDH nanocontainers allows them to intercalate a number of corrosion inhibitors and release them on demand under the action of corrosion relevant triggers. Moreover, their flexible use as pigments in paints or as a pre-treatment directly as conversion layers makes their implementation even more convenient. This review presents a critical view to the studies performed till today on LDHs for corrosion protection of aluminum alloys.

寻找替代铬酸盐基涂料的新替代品非常重要。自从由于六价铬对人类健康和环境的日益关注而正式颁布禁令以来，人们已经做出了巨大的努力来寻找一种更合适的铝合金防腐保护替代品。然而，由于潜在的替换需要满足在成本和优异的腐蚀性能方面的几个要求，因此该任务具有很大的挑战性。在过去的几年中，层状双氢氧化物（LDH）引起了人们的极大兴趣。已经提出将它们作为替代基于铬酸盐的保护系统的候选物。LDH纳米容器的特殊结构允许它们插入许多腐蚀抑制剂，并在腐蚀相关触发因素的作用下按需释放它们。此外，它们灵活地用作油漆中的颜料或直接用作转化层的预处理，使其实施更加方便。这篇评论对迄今为止对LDHs进行铝合金腐蚀防护研究的观点提出了批评。