## 1 Introduction
Consequently, the protection of metals and alloys using organic coatings is of great importance to reducing corrosion [24; 25; 26; 27]. Microsize commercial pigments are used in the coating systems, and have an essential effect on the organic coating properties. However, these coatings are not guaranteed to be free of defects and problems [28]; for example, ineffective adhesion problems, reduced coating elasticity, shock resistance loss, lower wear resistance, and low resistance to corrosion. Therefore, to overcome these defects and improve the coating's performance, nanopolymers can be involved in the coating; this is considered to be a modern method. These materials show a tremendous improvement in properties compared to traditional coatings, because of the small size of their particles. Moreover, the nanomaterials utilized in the coatings and the production of the coatings provide multiple functions [29]. [PERSON] et al. have reported the development of nanostructured polyaniline (PANI) and poly(1-naphthylamine) (PNA) incorporated into soya oil alkyld, and their corrosion protection performance [30]. Authors have monitored the anti-corrosion properties of developed composites using weight loss, electrochemical tests, and scanning electron microscopy. Electrochemical tests showed that the developed PNA/Alkyd composite exhibited the highest corrosion protection performance. [PERSON] et al. have studied the synthesis of nanopolyaniline (PANI) and poly-o-anisidine (POA), using the emulsion polymerization method in a micellar solution of SDS, and then their impregnation into alkyld paint, to improve its corrosion protection ability [31]. The anti-corrosion studies using the weight loss method showed that the nano PANI/Alkyd composite demonstrated excellent corrosion protection compared to POA/Alkyd coatings. The authors also reported a significant improvement in the scratch hardness of both coatings, compared with the pristine alkyld coating. On the other hand, [PERSON] et al. [15] studied the preparation and characterization of nano-iron oxide, and its impregnation into alkyld coatings for corrosion protection improvement. The authors reported excellent anti-corrosion properties in the developed coating formulation for steel in a 3.5% NaCl solution. Other successful applications of metallic nanoparticles incorporated into alkyld coatings have been reported in a recent publication by [PERSON] et al. [14]. In this research, an acrylic polyurethane (APU) coating, which consists of two components, an isocyanate in combination with nanomagnetite particles, was used. Magnetite, which has a high magnetic susceptibility, is highly adherent to the metal surface [32]. Magnetite is a magnetic oxide that can be prepared in various ways, including the co-precipitation method. It can also be produced from the interaction of iron and trioxide, as shown in the following equation: \begin{tabular}{c c c c} FeO & + & Fe\({}_{2}\)O\({}_{3}\) & \(\rightarrow\) & Fe\({}_{2}\)O\({}_{4}\) \\ Ferrous Oxide & & Ferric Oxide & Magnetic \\ \end{tabular}   
Drawing inspiration from similar studies on nanocomposites, the mechanical characteristics of these developed composites could potentially include an enhanced fracture toughness, superior strength-to-weight ratio, high tensile properties, increased fatigue resistance, and improved corrosion resistance to severe environments [33; 34; 35]. Additionally, based on analogous studies, as the weight percentage of nanomagnetic systems increases, there could be a significant enhancement in the material's mechanical behavior, similar to the linearly increasing Young's modulus and flexural modulus observed in certain studies when filler materials were added [36; 37; 38; 39]. The combination of the APU coating with nanomagnetic poly(aniline-co-o-toluidine) can be performed via copolymer, which is considered as a novel morphology, with better thermal stability and higher solubility compared to its homopolymers [40]. [PERSON] et al.