**7. Concluding remarks**

In conclusion, an impressive progress has been reported during the last few years regarding the preparation and the use of polymer-clay nanocomposites for corrosion protection. These materials offer a number of advantages, such as excellent mechanical and thermal stability, improved anticorrosion protection, and wide accessibility of clay. The corrosion protection properties of these materials were found influenced by the type of the clay and curing agents used to process the nanocomposites. Despite the significant progress of research efforts, a number of challenges remain untapped to understand the complex structure in clay-based nanocomposites. For example, exfoliation of clay layers into polymers matrix is still ambiguous to understand. This is very critical to prepare new nanocomposite with enhanced corrosion properties. A highly exfoliation of the clay inside the polymer matrix is usually difficult to attain. In addition, the most of works reported in the literature revealed the absence of direct relationship between the nanocomposite structures and their final anticorrosive properties most probably, thanks to negligence of the interface properties in determination of final anticorrosion performance. An in-depth understanding of the effect of morphology of clays on the corrosion performance of nanocomposites is necessary to design an ideal coating. With these present challenges combined with emergent interest in the use of polymer-clay nanocomposites for corrosion protection, it is certain that this field will continue to be a fast-moving research topic for the next several years.

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