Preparation and Properties of Chrome-Free Colored Na3AlF6 Conversion Coating on Aluminum Alloy
2012 ◽
Vol 490-495
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pp. 3527-3530
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Keyword(s):
By adding tannic acid and film-forming accelerator in the treatment solution containing titanium and zirconium ions, a golden conversion coating on the surface of aluminum alloy was prepared. The main component and corrosion resistance of the conversion coating were characterized by means of EDS, SEM, XRD and electrochemical workstation. The conversion coating was golden and showed as uniform cubical crystal. results also showed that the main component of the conversion coating was Na3AlF6. In potentiodynamic polarization test, the corrosion current density of the aluminum alloy decreases to 0.083 A•cm-2 from 5.894 A•cm-2, which indicated an obvious improvement of corrosion resistance.
2011 ◽
Vol 117-119
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pp. 1365-1369