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Corrosion Investigations of Black Chromite Films on Zn and Zn-Co Coatings with Low Cobalt Content

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Abstract

The corrosion resistance and protective ability of black-colored chromite (Cr3+ based) and chromium-free conversion films (CFs) on electrodeposited zinc and Zn-Co alloy coatings having low cobalt content in a neutral model medium of 3% NaCl solution have been investigated and characterized. Test methods such as polarization resistance measurements, scanning electron microscopy, EDS, x-ray diffraction analysis, and x-ray photoelectron spectroscopy analyses have been applied in order to scrutinize the actual protective characteristics of these films as well as to determine the composition of the corrosion products appearing as a result of the treatment in the corrosion medium. The experimental results revealed better protective characteristics, consequently superior performance of the electrodeposits with chromite films compared to these with chromium free or without any additional CF. The processes occurring on the sample’s surface during the immersion in the chemical conversion solutions as well as the influence of the H3PO4 in the course of the treatment are also commented on and discussed.

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Authors and Affiliations

  1. Institute of Physical Chemistry, Bulgarian Academy of Sciences, “Academician G. Bonchev” bl. No. 11, 1113, Sofia, Bulgaria

    Nikolai Boshkov, Neli Boshkova, Vasil Bachvarov & Miglena Peshova

  2. Faculty of Chemistry and Pharmacy, University of Sofia, “James Bourchier” No. 1, Sofia, Bulgaria

    Ludmil Lutov

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  1. Nikolai Boshkov
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  2. Neli Boshkova
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Correspondence to Nikolai Boshkov.

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Boshkov, N., Boshkova, N., Bachvarov, V. et al. Corrosion Investigations of Black Chromite Films on Zn and Zn-Co Coatings with Low Cobalt Content. J. of Materi Eng and Perform 24, 4736–4745 (2015). https://doi.org/10.1007/s11665-015-1794-5

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  • DOI: https://doi.org/10.1007/s11665-015-1794-5

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