(中国海洋大学 材料科学与工程学院，青岛 266100)
摘 要: 针对镁合金表面单一水滑石膜开裂严重的问题，采用植酸对其进行后处理，制备水滑石/植酸复合膜。利用扫描电镜、X射线衍射仪、傅里叶红外光谱仪及电化学实验等分析手段，研究植酸pH值对水滑石/植酸复合膜微观形貌、组织成分以及电化学性能的影响，探讨水滑石/植酸复合膜的成膜机制。结果表明：植酸后处理可以改善膜层裂纹，植酸pH值影响水滑石/植酸复合膜的致密性及化学组成；当植酸溶液的pH值为7时，水滑石/植酸复合膜最致密，膜层耐腐蚀性最优。
关键字: 镁合金；水滑石/植酸复合膜；耐腐蚀性；成膜机制
（School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China）
Abstract:In view of the serious cracking of the single hydrotalcite film on the surface of magnesium alloy, the hydrotalcite/phytic acid (LDHs/PA) film was prepared by phytic acid post-treatment. The morphology, chemical composition and electrochemical property of the film were studied by means of SEM, XRD, FT-IR and electrochemical experiments. The formation mechanism of the film was discussed. The results show that the phytic acid post-treatment can improve the crack of the LDHs film. The pH value of phytic acid has effects on the compactness and chemical composition of the LDHs/PA film. When the pH value of phytic acid is 7, the LDHs/PA film is the densest and the corrosion resistance is the best.
Key words: magnesium alloy; LDHs/PA film; corrosion resistance; film forming mechanism
