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In-Situ Synthesis of Zif-8 Nanocomposite Coating on Carbon Steel and Investigating the Effect of Adding Mbt on Corrosion Behavior and Sic Nanoparticles on Mechanical Properties

Asadian Dashbolagh, Mohammad Javad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55947 (07)
  4. University: Sharif University of Technology
  5. Department: Materials science and Engineering
  6. Advisor(s): Abachi, Parvin; Dolati, Abolghasem
  7. Abstract:
  8. Nowadays, metal-organic frameworks have received a lot of attention due to their properties and characteristics such as controllable structure, high specific surface area and the tunable porosity size and have found many applications. One group of metal-organic frameworks are zeolitic imidazolate frameworks which ZIF-8 is a member of this family, and many studies have been conducted on it. In the present study, ZIF-8 nanocomposite coating was applied to the plain carbon steel substrate by synthesis at room temperature and immersion method, and its corrosion behavior and mechanical properties were investigated. The effect of Mercaptobenzothiazole (MBT) inhibitor on corrosion behavior and silicon carbide (SiC) nanoparticles on mechanical properties was investigated. By synthesizing ZIF-8 coating in different coating times including 2, 4 and 6 hours, the corrosion current density of steel in salty water was reduced from 19.1 to 2.5, 1.2 and 0.59 µA/cm2, respectively. The addition of inhibitor with different concentrations including 1, 3, and 5% wt. by weight of zinc nitrate, decreased the corrosion current density to 3.3, 0.98, and 0.66 µA /cm2, respectively. ZIF-8 coating reduced the friction coefficient of steel from 0.25 to 0.05. By adding different concentrations of silicon carbide including 1, 3, and 5% wt. by weight of zinc nitrate, the friction coefficient reached 0.1, 0.12, and 0.25, respectively, and 3% wt. was found as the optimal value. Finally, ZIF-8 coating was subjected to nanohardness, nanoscratch and atomic force microscopy (AFM) tests. The hardness value and Young's modulus of ZIF-8 coating were equal to 0.17 and 23.6 GPa, respectively, the friction coefficient was equal to 0.3 and the surface roughness was equal to 570.91 nm
  9. Keywords:
  10. Metal-Organic Framework ; Nanoindentation ; Nano-Composite Coating ; Nanoscratch ; Zeolite Imidazolate Framework ; Mercaptobenzothiazole ; In-Situ Synthesis ; Carbon Steels

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