The corrosion resistance of FeCoNiCr high-entropy alloy deposits was investigated upon being prepared by current electrodeposition. The coatings were co-deposited in an electrolyte of an aqueous ferrous, cobalt, nickel, and chromium sulfates solution. Energy dispersive spectrometry analysis demonstrated that all four elements were co-deposited successfully. At the same time, the results from SEM indicate that the surface of the coating exhibits a granular morphology, with uniform density and no presence of cracks, with sizes ranging from 500 nm to 5 μm. Furthermore, X-ray diffraction patterns enunciated that the as-deposited coatings were amorphous. The polarization curves of the FeCoNiCr high-entropy alloy coating were measured by an electrochemical workstation in 3.5 wt.% NaCl, 1 mol·L⁻¹ H₂SO₄ and 1 mol·L⁻¹ NaOH solutions. The results revealed that the coating exhibited excellent corrosion resistance. The corrosion mechanism of the FeCoNiCr high-entropy alloy coating was analyzed in different environments. Moreover, the scratch testing method was employed to determine the alloy adhesion on the substrate, with higher values obtained for the FeCoNiCr alloy.

Background/Objectives: Amorphization can enhance dissolution of poorly water-soluble drugs, but crystallization during storage can compromise this benefit. Three nominally equimolar systems of amorphous (S)-naproxen (NAP), a poor glass former, were prepared with β-D-maltose octaacetate (acMAL; a neutral co-former), N-methyl-D-glucamine (meglumine, MEG; a base capable of ionic association), or zeolitic imidazolate framework-8 (ZIF-8; a porous host). We tested whether NAP crystallization resistance during humid storage followed the fresh-state ranking of glass-transition temperature (T_g) and structural α-relaxation times (τ_α). Methods: Powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and broadband dielectric spectroscopy (BDS) characterized physical states, molecular associations, and structural dynamics, while nitrogen sorption assessed ZIF-8 pore accessibility. PXRD and DSC monitored crystallization over 30 days at 298 K and 60% relative humidity. Results: NAP–acMAL exhibited nonionic, nonideal mixing, whereas NAP–MEG showed ionic association. After normalization to ZIF-8 mass, NAP–ZIF-8 showed approximately 81% lower nitrogen uptake than neat ZIF-8, consistent with porous-host restriction. In freshly prepared samples, T_g and BDS-derived structural α-relaxation times τ_α at a common temperature both followed the order NAP–ZIF-8 > NAP–MEG > NAP–acMAL. During humid storage, NAP crystallization was detected in NAP–MEG by day 1 and in NAP–acMAL by day 14, whereas not detected in NAP–ZIF-8 throughout the 30-day study. Conclusions: The humid-storage stability ranking differed from the fresh-state T_g and τ_α order, suggesting that sustained resistance to NAP crystallization also depends on whether molecular association or porous-host restriction remains effective during storage.