Journal
SURFACE & COATINGS TECHNOLOGY
Volume 328, Issue -, Pages 335-343Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2017.09.014
Keywords
Phosphate coating; Magnesium alloy; Chemical conversion; Nano-CeO2; Corrosion resistance
Funding
- National Natural Science Foundation of China [51601133]
- Key Laboratory for Green Chemical Process of Ministry of Education [GCP201504]
- Hubei Key Laboratory of Novel Chemical Reactor & Green Chemical Technology [NRGCT201504]
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A nano-CeO2 modified phosphate composite coating was prepared on magnesium alloy AZ91D by chemical conversion. The nano-CeO2/phosphate composite coating was composed of Zn-3(PO4)(2)center dot 4H(2)O, Zn2Mg(PO4)(2) and CeO2, with less mud-cracks and pores. With nano-CeO2 modification, the corrosion resistance and the mechanical performance of the nano-CeO2/phosphate composite coating were improved significantly compared with those of the single phosphate coating. The coating resistance and the corrosion current density for the composite coated alloy were respectively larger and lower than those for the single phosphated alloy, particularly for the alloy with the composite coating containing 1.02 wf% CeO2, which was formed in the treatment bath containing 2.0 g/L nano-CeO2. The adhesive force and the micro-hardness of the nano-CeO2/phosphate composite coating were higher than those of the single phosphate coating. The mechanism of nano-CeO2 modification on the electro-chemical and physical properties was very closely associated with the effects of nano-CeO2 particles on the grain refinement and the dispersion strengthening. (C) 2017 Elsevier B.V. All rights reserved.
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