### Nanomaterials/Nano-Modified Coatings as Corrosion Inhibitors
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**S. No.**} & \multicolumn{2}{c}{**Nano-Modified**} & \multirow{2}{*}{**Metal/Alloy**} & \multirow{2}{*}{**Corrosive**} & \multirow{2}{*}{**CI**} & \multirow{2}{*}{**Techniques**} & \multirow{2}{*}{**Best IE\%**} & \multirow{2}{*}{**Refs.**} \\  & \multicolumn{2}{c}{**Based CIs**} & & & & & & \\ \hline
**1.** & \begin{tabular}{c} Nanocomposite \\ polyurethane coatings \\ \end{tabular} & Mild steel (MS) & \
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & 3\% loading & SEM, FT-IR &
\begin{tabular}{c} Hydrophobic nature \\ attained up to 105\({}^{\circ}\) \\ \end{tabular} & [44] \\ \hline
**2.** & \begin{tabular}{c} ZrO2 NPs \\ \end{tabular} & \
\begin{tabular}{c} AA2024 \\ aluminium (Al) \\ alloy \\ \end{tabular} &
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & 20 ppm & PDP, EIS & 93.6\% & [46] \\ \hline
**3.** & \begin{tabular}{c} Ce (OH) in the PEO coating \\ \end{tabular} & \begin{tabular}{c} AZ31 Mg alloy \\ \end{tabular} & \
\begin{tabular}{c} 0.5 wt.\% NaCl \\ medium \\ \end{tabular} & 50/50 vol.\% &
\begin{tabular}{c} EIS, gravimetric \\ method \\ \end{tabular} & 91.36\% & [47] \\ \hline
**4.** & \begin{tabular}{c} NiAl-layered double \\ hydroxide (NiAl-LDH) \\ nanocoating \\ \end{tabular} & \begin{tabular}{c} AZ31 Mg alloy \\ \end{tabular} & \
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & - & FT-IR, XED, SEM &
\begin{tabular}{c} Achieved minimal \\ corrosion current \\ density of 1.06 nA cm\({}^{-2}\) \\ \end{tabular} & [48] \\ \hline
**5.** &
\begin{tabular}{c} Polyvinyl \\ pyrolodine-stabilized NPs \\ \end{tabular} & Carbon steel & 1M HCl medium & 0.1\% & PDP, EIS, SEM & 98.39\% & [49] \\ \hline
**6.** & \
\begin{tabular}{c} Polyaniline-silver \\ nanoparticle coatings \\ \end{tabular} & 6061 Al alloy & 1M HCl medium & 20 wt.\% &
\begin{tabular}{c} SEM, TEM, TGA, \\ XRD \\ \end{tabular} & 96\% & [50] \\ \hline
**7.** & \begin{tabular}{c} CeO2 NPs \\ \end{tabular} & Al & \
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & - & EIS, DFT &
\begin{tabular}{c} Root 690 k\(\Omega\) cm\({}^{2}\) \\ \end{tabular} & [51] \\ \hline
**8.** & \begin{tabular}{c} ZnG@2 IF-8/EP coatings \\ \end{tabular} & AZ31B Mg alloy & \
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & - &
\begin{tabular}{c} EIS, PDP, \\ gravimetric \\ analysis \\ \end{tabular} & 99.8\% & [52] \\ \hline
**9.** &
\begin{tabular}{c} Lotus petal-integrated \\ manganese oxide NPs \\ \end{tabular} & MS & 1M HCl medium & 200 ppm & XRD, TGA, SEM & 72.63\% & [53] \\ \hline
**10.** & \begin{tabular}{c} Wood fly ash NPs \\ \end{tabular} & \
\begin{tabular}{c} 705-T651 Al \\ alloy \\ \end{tabular} &
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & - & EIS, PDP & 97.61\% & [54] \\ \hline
**11.** & \begin{tabular}{c} Silver NPs encapsulated \\ with SiO2 \\ \end{tabular} & 2024-T3 Al alloy & \
\begin{tabular}{c} 0.1 M NaCl \\ medium \\ \end{tabular} & 50\(\mu\)L & SEM, EIS &
\begin{tabular}{c} Lesser pits were found \\ on the surface after \\ inhibitor addition \\ \end{tabular} & [55] \\ \hline
**12.** & \begin{tabular}{c} Zinc Molybdate (ZM) \\ encapsulated NPs \\ \end{tabular} & MS & \
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & 1\% content & EIS, PDP &
\begin{tabular}{c} Attained a C\({}_{\text{R}}\) \\ 0.0005941 mm/y \\ \end{tabular} & [56] \\ \hline
**13.** & \begin{tabular}{c} Stearic Acid/CoO2 bilayer \\ nanocoating \\ \end{tabular} & AZ31B Mg alloy & \
\begin{tabular}{c} 3.5 wt.\% NaCl \\ medium \\ \end{tabular} & - &
\begin{tabular}{c} SEM, XRD, EIS, \\ Contact angle \\ analysis \\ \end{tabular} & 89.63\% & [57] \\ \hline
**14.** & \begin{tabular}{c} Mechanized hollow \\ mesoporous silica NPs \\ \end{tabular} & AA2024 Al alloy & \
\begin{tabular}{c} 0.1M NaCl \\ medium \\ \end{tabular} & - & EIS, PDP, XRD &
\begin{tabular}{c} A coating thickness of \\ about 4.5 \(\mu\)m was \\ attained \\ \end{tabular} & [58] \\ \hline
**15.** & \
\begin{tabular}{c} Ceria-doped Polyvinyl \\ chloride nanofiber \\ \end{tabular} & Al &
\begin{tabular}{c} 0.1M HCl \\ medium \\ \end{tabular} & 5 wt.\% & SEM, EIS, TEM & 85.7\% & [59] \\ \hline \hline \end{tabular}
\end{table}