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Corrosion Resistance Enhancement of AZ91D Magnesium Alloy by Electroless Ni-Co-P Coating and Ni-Co-P-SiO2 Nanocomposite

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Abstract

Electroless Ni-Co-P coating and Ni-Co-P-SiO2 nanocomposites were successfully applied on AZ91D magnesium alloy via environmentally friendly cerium-lanthanum-permanganate treatment and their properties were compared with traditionally binary Ni-P coating. The prepared coatings were analyzed using scanning electron microscopy, x-ray diffraction, and energy dispersive x-ray spectroscopy. Moreover, the corrosion behavior of the coatings in 3.5 wt.% NaCl was evaluated by two electrochemical methods. It is found that the Ni-Co-P coating possesses more uniform and compact structure and better corrosion protection characteristics in comparison with the Ni-P coating. The plating rate of Ni-Co-P bath is relatively lower than the Ni-P bath, but it significantly increases after addition of SiO2 nanoparticles more probably due to adsorption of silica nanoparticles on alloy surface. The corrosion resistance of Ni-Co-P-SiO2 composite coatings was superior with respect to Ni-P and Ni-Co-P coatings due to formation of thick and compact coating with tortuous grain boundaries.

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Authors and Affiliations

  1. Applied Chemistry Department, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran

    Davod Seifzadeh & Amin Rahimzadeh Hollagh

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  1. Davod Seifzadeh
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  2. Amin Rahimzadeh Hollagh
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Correspondence to Davod Seifzadeh.

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Seifzadeh, D., Rahimzadeh Hollagh, A. Corrosion Resistance Enhancement of AZ91D Magnesium Alloy by Electroless Ni-Co-P Coating and Ni-Co-P-SiO2 Nanocomposite. J. of Materi Eng and Perform 23, 4109–4121 (2014). https://doi.org/10.1007/s11665-014-1210-6

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  • DOI: https://doi.org/10.1007/s11665-014-1210-6

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