Magnesium (Mg) alloys have shown great potential for biomedical implant materials due to their biodegradability and suitable mechanical strength. Recent works have shown that biomedical Mg alloys suffered from accelerated degradation rates when exposed to a stressed condition in biological media. Therefore, it is necessary to endow Mg alloys with enhanced stress corrosion cracking resistance. In this study, phytic acid (PA), branched polyethylenimine (bPEI) and graphene oxide (GO) were introduced onto Mg1Zn alloy via layer-by-layer (LbL) assembly technique. The characteristics of the multilayer films were investigated by SEM, FTIR and XPS. Biodegradability Corrosion resistance of the samples was measured by electrochemical and immersion tests. The stress corrosion cracking (SCC) behaviour of the LbL coated Mg alloys was performed using slow strain rate tensile (SSRT) tests. The results showed that the multilayer coating with smooth and uniform morphologies could enhance the corrosion resistance of Mg alloys due to the physical barrier. The LbL coating exhibited a remarkable ability to improve the SCC resistance of Mg1Zn alloy in Dulbecco's modified eagle medium.

镁（Mg）合金由于具有生物可降解性和合适的机械强度，因此在生物医学植入材料中显示出巨大的潜力。最近的工作表明，生物医学镁合金在生物介质中暴露于压力条件下会加速降解。因此，有必要赋予镁合金增强的抗应力腐蚀开裂性。在这项研究中，将植酸（PA），支链聚乙烯亚胺（bPEI）和氧化石墨烯（GO）引入到Mg上1Zn合金通过逐层（LbL）组装技术。通过SEM，FTIR和XPS研究了多层膜的特性。生物降解性样品的耐腐蚀性通过电化学和浸没测试进行测量。LbL涂层的Mg合金的应力腐蚀开裂（SCC）行为是使用慢应变速率拉伸（SSRT）测试进行的。结果表明，由于物理阻挡层的影响，具有光滑，均匀形貌的多层涂层可以提高镁合金的耐蚀性。在Dulbecco改良的Eagle介质中，LbL涂层显示出显着的提高Mg 1Zn合金抗SCC性能的能力。