Yao Xinran, Fu Qi, Song Guang-Ling, Wang Kai
Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Division of Materials Engineering, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia.
Materials (Basel). 2025 Aug 6;18(15):3698. doi: 10.3390/ma18153698.
In the medical field, magnesium (Mg) alloys have been widely used due to their excellent antibacterial properties and biodegradability. However, in the marine environment, the antibacterial effect may be greatly attenuated, and consequently, microorganisms in the ocean are likely to adhere to the surface of Mg alloys, resulting in biocorrosion damage, which is really troublesome in the maritime industry and can even be disastrous to the navy. Currently, there is a lack of research on the biocorrosion of Mg alloys that may find important applications in marine engineering. In this paper, the biocorrosion mechanism of the Mg alloy Mg-3Nd-2Gd-Zn-Zr caused by (), a typical marine microalga, was studied. The results showed that the biomineralization process in the artificial seawater containing a low concentration of cells was accelerated compared with that in the abiotic artificial seawater, leading to the deposition of CaCO on the surface to inhibit the localized corrosion of the Mg alloy, whereas a high concentration of cells produced a high content of organic acids at some sites through photosynthesis to significantly accelerate the surface film rupture at some sites and severe localized corrosion there, but meanwhile, it resulted in the formation of a more protective biomineralized film in the other areas to greatly alleviate the corrosion. The contradictory biocorrosion behaviors on the Mg-3Nd-2Gd-Zn-Zr alloy induced by were finally explained by a mechanism proposed in the paper.
在医学领域，镁（Mg）合金因其优异的抗菌性能和生物可降解性而被广泛应用。然而，在海洋环境中，其抗菌效果可能会大大减弱，因此，海洋中的微生物很可能附着在镁合金表面，导致生物腐蚀损伤，这在海事行业中着实棘手，甚至可能给海军带来灾难。目前，对于可能在海洋工程中有重要应用的镁合金生物腐蚀缺乏研究。本文研究了典型海洋微藻（）引起的Mg-3Nd-2Gd-Zn-Zr镁合金的生物腐蚀机制。结果表明，与非生物人工海水中相比，含有低浓度细胞的人工海水中的生物矿化过程加速，导致CaCO在表面沉积，抑制了镁合金的局部腐蚀，而高浓度的细胞通过光合作用在某些部位产生高含量的有机酸，显著加速了某些部位的表面膜破裂和严重的局部腐蚀，但同时，它在其他区域导致形成更具保护性的生物矿化膜，大大减轻了腐蚀。本文提出的一种机制最终解释了由引起的Mg-3Nd-2Gd-Zn-Zr合金上相互矛盾的生物腐蚀行为。
