<p>The application of anticorrosion composite coating is a successful strategy for preventing metal corrosiveness. Application of Nanoparticles as Corrosion inhibitors effectively prevents the corrosion of metals compared to existing corrosion inhibitors. Conventional corrosion inhibitors are toxic to the environment. Following exploitation, the epoxy coatings on the steel erode as well. Nanoparticles are therefore introduced to prevent it. In this paper, NiZn₂O₄ Nanoparticles are synthesized by polymeric precursor method using alginic acid. Epoxy resin is infused with the synthesised nano NiZn₂O₄ to prevent mild steel from corroding. Nano NiO and ZnO has a high corrosion resistance. Hence NiZn₂O₄ was prepared which will have a synergistic effect thereby preventing oxidation and environment friendly. To examine its efficiency different concentrations of (1%,3%,5%) of NiZn₂O₄ nanoparticles were added to epoxy coating and applied on mild steel in 1.0&#xa0;M HCl solutions. Using potentiodynamic polarisation and gravimetric (weight loss) techniques, the corrosion inhibiton efficiency was examined. A gravimetric investigation was carried out within 15&#xa0;days of exposure, and the findings indicated that weight loss increase with exposure duration but diminished with higher NiZn₂O₄NP concentration. Additionally, the presence of NiZn₂O₄NPs altered the process of anodic dissolution and cathodic hydrogen gas evolution, according to potentiodynamic polarisation data from electrochemical impedance spectroscopy. From the results we observed that 3% loading of NiZn₂O₄ Nanoparticle coating was efficient with high corrosion resistance (Low corrosion rate 0.0107). These findings showed that NiZn₂O₄NPs might be added to the current inhibitors to reduce the rate of corrosion.</p>