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The Study of Phosphate Film on Steel Surface with the Assistance of Cu[SC(NH2)2]32+ and Carboxyl Copolymer

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Abstract:

In our studied phosphating system we used the urea complex of copper (Cu[SC(NH2)2]32+) as the film promoter to instead of the nitrite and nitrate in traditional steel phosphating solution. We determined the changes of each component phosphate solution during specimen handling, and preliminary explorated the formation mechanism. Results showed that: compared to conventional zinc phosphating process the solution was stability, all the ferrous iron was formed the film, and FePO4 had not precipitated in the phosphating system; the phase of the phosphate film was formed by the small grain which was Fe2Zn(PO4)2•4H2O and Zn3(PO4)2•4H2O mixed in the proportional spherical crystals to instead of the Zn3(PO4)2•4H2O-based that was needle-like or leaf-shaped loose crystals.

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Periodical:

Advanced Materials Research (Volumes 512-515)

Pages:

1819-1822

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.512-515.1819

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Online since:

May 2012

Authors:

Ze Min Chen, Pin Lu, Yan Jia

Keywords:

Carboxyl Copolymer, Phosphate Film, Urea Complex of Copper

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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