Doubly Doped Mg-Al-V<sub>2</sub>O<sub>7</sub><sup>4–</sup> Layered Double Hydroxide/Mo<sub>2</sub>CT<sub><i>x</i></sub> MXene Nanosheet Composites for Wear- and Corrosion-Resistant Coatings
Xinfang Zhang, Changqing Yin, Shupei Liu, Dalong Cong, Zhongsheng Li, J.Y. Wang, Tao Sun, Xiaoying Liu, Zhenyu Liang, Shuai Jiang, Jinjin Li, Shuang Yi, Yuxin Zhang, Jinsong Rao
Abstract
Two-dimensional (2D) nanomaterials have proven that potential applications in protecting metals from corrosion and wear. However, it remains a challenge in easy agglomeration and complex functionalization of 2D nanosheets in nanocomposite coatings. Herein, Co-doped MgAl-V 2 O 7 4– layered double hydroxide (LDH) with transition metal carbide (Mo 2 CT x ) nanosheet composites (CV-LDH-MXene) was synthesized by using a doping-electrostatic synergistic assembly strategy. After layer-by-layer assembly, nanosheet composite coatings had thicknesses of −6.9 μm. The corrosion results show that the incorporation of the CV-LDH-MXene nanocomposite coating can increase impedance at 10 –2 Hz by 1 order of magnitude compared to pure LDH coating and decrease the corrosion current density by ∼30-fold. Furthermore, the friction results claimed that the CV-LDH-MXene nanosheet composites could make the coefficient of friction maintain at 0.09 after the running-in period, which displayed excellent relatively stable and anti-wear properties. These phenomena confirmed that there existed a synergistic effect of V 2 O 7 4– intercalation and layer-assembled Mo 2 CT x MXene, which achieved stable anti-corrosion and wear characteristics. This investigation proved a substantial significance for the creation of LDH and MXene nanosheets and a giant step forward in the application of anti-corrosion and anti-wear. In particular, we promote the application of nautical instruments, underwater weapons, and seawater batteries in the shipbuilding industry and marine engineering.