Anticorrosion performance of hydrophobic acid-modified-MOFs/epoxy coatings

作者：Wei, Runzhi; Liu, Zheng^*; Wei, Wenchang; Wang, Sheng; Yi-ju Lv^*; Guo-Cheng Han^*

来源：Colloid and Interface Science Communications, 2022, 46: 100580.

DOI：10.1016/j.colcom.2021.100580

• NMOFs/OPA
• super-hydrophobic
• anticorrosive performance
• Epoxy coating

Two nano metal-organic frameworks (NMOFs), [Cu(2,6-dmy-3,5-pyda)(4)](n) (namely Cu-MOFs) and {[Zn(2,6-dmy3,5-pyda)(2)(4,4'-bipy) (H2O)]center dot H2O}n (namely Zn-MOFs) with the unsaturated metal sites were hydrophobically modified by octadecylphosphonic acid (OPA) to prepare MOFs/OPA hydrophobic composites, which were added as hydrophobic additives to the epoxy (EP) coating to prepare Cu-MOFs/OPA/EP and Zn-MOFs/OPA/EP anticorrosion coating. The corrosion protection behavior of these coatings was examined in 3.5 wt% NaCl solution by using EIS, the capacitive arc of the coating modified with Cu-MOFs/OPA and Zn-MOFs/OPA was larger than EP, and Rp increases from 1.283 x 10(7) to 6.111 x 10(8) and 7.415 x 10(8), respectively. The two anticorrosion coatings showed higher impedance modulus values in low frequency region. All the study results proved that both CuMOFs/OPA and Zn-MOFs/OPA composite materials with the EP coating provided a very strong barrier and shielding effect, and have the ability to enhance the anticorrosive performance of the epoxy coating

• 单位
  桂林理工大学