Modification Effect of Ce Addition to Metaphosphate Electrolyte on Anodic Oxide Film of Magnesium Alloy
CHAI Rong1, GUO Feng1,2,*, KANG Yu1, CAI Huisheng1,2, SU Juan1,2
1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2 Inner Mongolia Key Laboratory of New Materials and Surface Engineering, Hohhot 010051, China
Abstract: The corrosion protection performance of anodic oxide film on magnesium alloy substrate depends on the microstructure of the oxide film, and the electrolyte composition is a crucial process factor influencing the microstructure of anodic oxide film on magnesium alloy. In this study, EDTA-Ce was added to a (NaPO3)6-NaOH-C10H16N2O8 (EDTA) metaphosphate electrolyte, and anodic oxide films were prepared on the surface of AZ31 magnesium alloy using a direct current (DC) constant voltage mode. The effects of Ce in the electrolyte on the microstructure and electrochemical corrosion performance of the anodic oxide film and its causes were investigated. The results show that an appropriate amount of EDTA-Ce can reduce the pores of the oxide film and improve the compactness of the film, but has no obvious inhibitory effect on cracking of the film. EDTA-Ce participates in the formation of the oxide film, with Ce being uniformly distributed in MgO in the form of nanoscale CeO2, an MgO/CeO2 composite oxide film based on MgO is formed on the surface of the magnesium alloy substrate. When the EDTA-Ce additive amount is 0.4 mmol/L in the electrolyte, the oxide film exhibits the most positive corrosion potential (-1.034 V) and the lowest corrosion current density (9.45×10-7 A·cm-2) in NaCl solution, the capacitance value of the inner layer of the oxide film is the smallest, the oxide film has the best corrosion protection effect on the magnesium alloy substrate.
柴榕, 郭锋, 康裕, 蔡会生, 苏娟. 偏磷酸盐电解液中添加Ce对镁合金阳极氧化膜的改性作用[J]. 材料导报, 2026, 40(10): 25020133-5.
CHAI Rong, GUO Feng, KANG Yu, CAI Huisheng, SU Juan. Modification Effect of Ce Addition to Metaphosphate Electrolyte on Anodic Oxide Film of Magnesium Alloy. Materials Reports, 2026, 40(10): 25020133-5.
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2026, Vol. 40 
