<p>The primary aim of this study is to synthesize and characterize Ni-Mn alloy coatings prepared by the electrodeposition technique and to evaluate their structural, morphological, and corrosion resistance properties. This study evaluates the electrochemical response of Ni-Mn alloy deposition on mild steel (MS) substrates intended for automotive corrosion protection applications. The Ni-Mn coating is carried out using an optimized plating bath, with sodium vinyl sulfonate acting as a brightener to improve the uniformity of the deposition. The composition of the plating bath and operating parameters is optimized using the Hull cell technique. The electrodeposition is performed at multiple current densities (CDs), and the uniform deposition was observed at the CD 3 A dm⁻². The surface morphology of the coating is examined using scanning electron microscopy (SEM) and atomic force microscopy (AFM), while energy-dispersive x-ray spectroscopy (EDX) confirms the presence of Ni, O, Fe, and Mn elements in both the coated and uncoated samples. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) analysis are used to evaluate the corrosion behaviors of the coatings. A new optimized bath is found to promote the uniform and bright Ni-Mn coating, resulting in enhanced corrosion properties. The Ni-Mn alloy coating offers a unique combination of enhanced corrosion resistance and improved surface brightness compared to conventional Ni coating, achieved through controlled Mn incorporation. This alloy reveals a sustainable and eco-friendly alternative for automotive corrosion protection, with custom-made structural and morphological properties optimized via electrodeposition. </p>