期刊
SURFACE & COATINGS TECHNOLOGY
卷 205, 期 11, 页码 3455-3460出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.12.011
关键词
Carbon steel; Zinc phosphate coating; Nano-SiO2; Microstructure; Corrosion resistance
资金
- National Nature Science Fund of China [50571059, 50615024]
- Program for New Century Excellent Talents in University [NCET-07-0536]
- Program for Innovative Industrial in Nantong City [AA2010001]
In this paper, nano-SiO2 was used as an accelerator for improving the microstructure and the corrosion resistance of phosphate coating on carbon steel. The chemical composition and microstructure of the coatings were analyzed by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The effects of nano-SiO2 on weight, roughness and corrosion resistance of the phosphate coatings were also investigated. Results show that the compositions of phosphate coating were Zn-3(PO4)(2)center dot 4H(2)O (hopeite), and Zn2Fe (PO4)(2)center dot 4H(2)O (phosphophylite). The phosphate coatings became denser due to the addition of nano-SiO2 which reduced the size of the crystal clusters. The average weight of phosphate coatings approximately linearly increased with the nano-SiO2 content in the bath from 0 to 4 g/L, and the phosphate coatings formed in bath containing 2 g/L nano-SiO2 showed the highest corrosion resistance in 5 wt.% sodium chloride solution at ambient temperature. Nano-SiO2 would be widely utilized as a phosphating additive to replace the traditional nitrite, due to its less pollutant and its better quality of the coating. (C) 2010 Elsevier B.V. All rights reserved.
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