期刊
SURFACE & COATINGS TECHNOLOGY
卷 203, 期 9, 页码 1107-1113出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2008.10.004
关键词
Phosphate; Conversion film; Mg-Li alloy; Corrosion resistance
资金
- National Key Basic Research Program [2007CB613705]
- National Key Technology RD Program [2006BAE04B05-2]
The super light Mg-Li alloys exhibit excellent formability due to the addition of lithium, but the corrosion resistance is deteriorated. A novel conversion film is developed to improve the corrosion resistance. The surface morphology of conversion film was observed using scanning electron microscopy (SEM). The chemical composition was analyzed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The corrosion behaviors of Mg-8.8Li alloy and conversion film were investigated with electrochemical and immersion tests. The experimental results indicated that the Mg-8.8Li alloys with and without the protection of conversion film can both be used in NaOH solution safely. But the Mg-8.8Li substrate was susceptible to corrode in NaCl and Na(2)SO(4) solutions, and the conversion film can prevent them from corroding. Compared with the NaCl solution, the Na(2)SO(4) solution was a strong corrosive medium to the conversion film. (C) 2008 Elsevier B.V. All rights reserved.
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