Iranian Polymer Journal

, Volume 23, Issue 9, pp 699–706 | Cite as

Corrosion behavior of aluminum/silica/polystyrene nanostructured hybrid flakes

  • Naghmeh Amirshaqaqi
  • Mehdi Salami-KalajahiEmail author
  • Mohammad Mahdavian
Original Paper


The corrosion protection of aluminum flake pigments has been extended by means of an encapsulating inorganic/organic silica/polystyrene hybrid nanolayer. A silica nanolayer encapsulated the surface of aluminum flakes (Al) by hydrolysis and polycondensation of tetraethylorthosilicate via sol–gel process to yield Al/Si flakes. Then, 3-methacryloxypropyltrimethoxysilane (MPS) was used as surface modifier which has polymerizable groups to participate in polymerization reaction (Al/Si/MPS). A polystyrene (PS) coating layer was applied on Al/Si/MPS flakes by free radical polymerization of styrene initiating with Azobisisobutyronitrile at 60 °C and subsequent washing of free chains with solvent yielded Al/Si/PS flakes. Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy and scanning electron microscopy showed that silica and PS nanolayers were formed on the aluminum flakes. The attached PS chains on the surface were detached by hydrofluoric acid aqueous solution and analyzed by gel permeation chromatography (GPC). Also, a transmission electron microscopy image showed clearly that the encapsulating layers are in the scale of nano. Good results were obtained in terms of corrosion protection in acidic and alkaline solutions, indicating that the silica/polymer hybrid nanolayer coating acts as an efficient protective film. After encapsulating the flakes, the evolved hydrogen volume was dropped and hybrid nanolayer resulted in no evolved hydrogen volume.


Aluminum flakes Corrosion protection Polystyrene Silica In situ polymerization Encapsulation 



We are grateful for the financial support of the Iran National Science Foundation (INSF) (grant no. 91002479).


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Copyright information

© Iran Polymer and Petrochemical Institute 2014

Authors and Affiliations

  • Naghmeh Amirshaqaqi
    • 1
    • 2
  • Mehdi Salami-Kalajahi
    • 1
    • 2
    Email author
  • Mohammad Mahdavian
    • 3
  1. 1.Department of Polymer EngineeringSahand University of TechnologyTabrizIran
  2. 2.Institute of Polymeric MaterialsSahand University of TechnologyTabrizIran
  3. 3.Surface Coating and Corrosion DepartmentInstitute for Color Science and TechnologyTehranIran

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