Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University , Nanchong 637002, P.R. China.
Department of Chemistry, State University of New York at Binghamton , Binghamton, New York 13902, United States.
ACS Appl Mater Interfaces. 2017 Oct 18;9(41):36247-36260. doi: 10.1021/acsami.7b12036. Epub 2017 Oct 3.
The ability to manipulate the functionalization of Ni coating is of great importance in improving the corrosion resistance of magnesium (Mg) alloy for many industrial applications. In the present work, MCM-41 type mesoporous silica nanocontainers (MSNs) loaded with corrosion inhibitor (NaF) were synthesized and employed as smart reinforcements to enhance the integrity and corrosion inhibition of the Ni coating. The incorporation of the F-loaded MSNs (F@MSNs) to enhance the corrosion resistant capacity of a metallic coating is reported for the first time. The mesoporous structures of the as-prepared MSNs and F@MSNs were confirmed by transmission electron microscopy (TEM), small angle X-rays scattering (SAXS), and N adsorption-desorption isotherms. The X-ray photoelectron spectroscopy (XPS) data demonstrated the successful immobilization of fluoride ion on the MSNs and formation of a magnesium fluoride (MgF) protective film at the corrosion sites of the Mg alloy upon soaking in a F@MSNs-containing NaCl solution. The results from potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) for both bare Mg alloy and Ni coatings with and without F@MSNs have revealed a clear decrease in corrosion rate in a corrosive solution for a long-time immersion due to the introduction of F@MSNs. These findings open new opportunities in the exploration of self-healing metallic coatings for highly enhanced anticorrosion protection of Mg alloy.
操纵 Ni 涂层的功能化能力对于提高许多工业应用中镁 (Mg) 合金的耐腐蚀性非常重要。在本工作中，合成了负载有缓蚀剂 (NaF) 的 MCM-41 型介孔硅纳米容器 (MSNs)，并将其用作智能增强体来提高 Ni 涂层的完整性和缓蚀性能。首次报道了将 F 负载的 MSNs (F@MSNs) 掺入到金属涂层中以提高其耐腐蚀能力。通过透射电子显微镜 (TEM)、小角 X 射线散射 (SAXS) 和 N2 吸附-脱附等温线证实了所制备的 MSNs 和 F@MSNs 的介孔结构。X 射线光电子能谱 (XPS) 数据表明，氟离子成功地固定在 MSNs 上，并且在 F@MSNs 存在的 NaCl 溶液中浸泡后，在 Mg 合金的腐蚀部位形成了一层氟化镁 (MgF) 保护膜。对于裸 Mg 合金以及具有和不具有 F@MSNs 的 Ni 涂层的动电位极化 (PDP) 和电化学阻抗谱 (EIS) 的结果表明，由于引入了 F@MSNs，在腐蚀性溶液中长时间浸泡时，腐蚀速率明显降低。这些发现为探索自修复金属涂层提供了新的机会，从而为 Mg 合金提供了高度增强的耐腐蚀保护。
