<p>Herein, three samples of Pd-Ni alloy coatings were fabricated via electrodeposition. The microstructure, chemical composition, elemental states, and corrosion behavior of as-fabricated Pd-rich Pd-Ni coatings with nearly the same thickness were investigated. Based on the Pd/Ni proportions coated, the samples were denoted as Pd₄₀Ni₆₀, Pd_63.4Ni_36.6, and Pd₇₈Ni₂₂ coatings. Pd₄₀Ni₆₀ exhibits a smooth, dense surface free of defects, whereas Pd_63.4Ni_36.6 and Pd₇₈Ni₂₂ show a coarse-grained structure, increased surface roughness, and pore formation. Notwithstanding, the three samples scanned show excellent uniformity and continuity. The measured thicknesses of Pd₄₀Ni₆₀, Pd_63.4Ni_36.6 and Pd₇₈Ni₂₂ are 2.01, 2.72, and 2.45 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\upmu\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">μ</mi> </math></EquationSource> </InlineEquation>m, respectively, indicating nearly identical thicknesses. The coatings revealed a face-centered cubic structure, with diffraction peaks shifting to lower angles. This shift indicates that Ni is substituted by Pd in the lattice, leading to increase in lattice constant. Moreover, the presence of Pd⁰, Pd²⁺, Ni⁰, and Ni²⁺ species demonstrates significant differences in surface and subsurface composition. Among the coatings, the Pd_63.4Ni_36.6 coating exhibited a uniform and dense grain structure and the best overall corrosion resistance, characterized by having the most positive open-circuit potential, the largest capacitive response, and the highest charge-transfer resistance. Accordingly, we established a clear correlation among the structure, composition, and corrosion resistance of Pd-rich Pd-Ni coating, providing new insight into the design of corrosion-resistant Pd-based coatings.</p>