期刊
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
卷 29, 期 7, 页码 1453-1463出版社
SPRINGER
DOI: 10.1007/s12613-021-2377-0
关键词
Mg-Li alloy; plasma electrolytic oxidation; corrosion resistance; carbonate
类别
资金
- Natural Science Foundation of China [51771060, 51871068, 51971071, 52011530025]
- Domain Foundation of Equipment Advance Research of 13th Five-year Plan, China [61409220118]
- Zhejiang Province Key Research and Development Program, China [2021C01086]
- Open Foundation of Key Laboratory of Superlight Materials & Surface Technology of Ministry of Education, China [HEU10202104]
By adding carbonate to the silicate system electrolyte, the corrosion resistance of the plasma electrolytic oxidation coating on Mg-9Li-3Al alloy was improved. The addition of carbonate resulted in a denser coating with increased hardness, and the formation of the corrosion-resistant Li2CO3 phase.
Carbonate was added to the silicate system electrolyte to improve the corrosion resistance of the plasma electrolytic oxidation coating on Mg-9Li-3Al (wt%, LA93) alloy. The influences of carbonate on the morphology, structure, and phase composition of the coating were investigated by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy. The corrosion resistance of the coating was evaluated by electrochemical experiment, hydrogen evolution, and immersion test. The results showed that the addition of carbonate resulted in a denser coating with increased hardness, and the corrosion-resistant Li2CO3 phase was formed. Electrochemical experiments showed that compared with the coating without carbonate, the corrosion potential of the carbonate coating positively shifted (24 mV), and the corrosion current density was reduced by approximately an order of magnitude. The coating with carbonate addition possessed a high corrosion resistance and long-term protection capability.
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