**5. Conclusions**

The finding demonstrated that the reaction temperature and crystallization times have an influential effect on the growth mechanism of layered double hydroxide which ultimately has a strong impact on its corrosion resistance behavior. Well-grown uniformed structures were obtained at 80 and 100 ◦C with crystallization times of 18 and 24 h while the thickness of the obtained films lay in the range of 24–74 μm, which also imparted a significant influence on the corrosion resistance properties. The results from polarization curves confirmed that MgAl LDH stands as an improved

corrosion protection thin film, which demonstrates significantly high impedance and low corrosion current density as compared to the substrate. The thicker coatings (>30 μm, obtained on treating the substrate at 100 ◦C for 18 and 24 h) showed a remarkable decrease of the corrosion current (3–4 orders of magnitude) and a remarkable increase in low-frequency impedance (|*Z*|0.01) compared to the bare substrate. However, the long-term durability of the investigated coating is still an issue as after about one week of immersion in the 0.1 M NaCl solution, the impedance in the low-frequency range showed a decrease of a few orders of magnitude. Compared to the bare substrate the investigated coatings were revealed to be in any case quite protective compared to the bare AA6082 substrate.

**Author Contributions:** Conceptualization, M.F.; Data curation, M.A.I.; Formal analysis, M.A.I.; Funding acquisition, M.F.; Investigation, M.A.I.; Methodology, M.F. and M.A.I.; Supervision, M.F.; Project administration, M.F.; visualization, M.A.I., Writing—original draft, M.A.I.; Writing—review & editing, M.F.

**Funding:** This research received no external funding.

**Conflicts of Interest:** The authors declare no conflict of interest.
