Akademik Veri Yönetim Sistemi
Surface and Coatings Technology, cilt.515, 2025 (SCI-Expanded)
Plasma electrolytic oxidation (PEO) is a versatile technique employed to generate adherent and protective oxide layers on magnesium-based substrates through electrochemical plasma discharge. This study investigates the influence of 0.5 gˑL−1 strontium nitrate and 0.5 gˑL−1 chromium nitrate additives using an electrolyte system containing phosphate species during the PEO processing of AZ31B alloy under two distinct current regimes: 6 and 12 Aˑdm−2. Scanning electron microscopy (SEM) was employed to evaluate surface topology and to estimate the layer thickness of the coatings. Grazing incidence X-ray diffraction (GXRD) was utilized to identify the crystalline phases present in the coating structure. Surface wettability and roughness were evaluated through contact angle measurements and surface profilometry, respectively. Electrochemical techniques, including impedance spectroscopy and polarization analysis, were used to investigate the corrosion response of the coated samples. The incorporation of strontium improved coating compactness and hydrophobicity, leading to enhanced corrosion resistance. Notably, the Sr-modified coating formed at 12 Aˑdm−2 exhibited the highest performance, achieving a polarization resistance of 1480 kΩˑcm2 after 48 h of immersion. These results highlight the effectiveness of strontium-enhanced PEO processing in developing corrosion-resistant coatings for magnesium alloys.