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Effects of crystalline growth on corrosion behaviour of nanocrystalline NiAl coating

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Abstract

In the current work, the effect of crystalline growth on the corrosion behaviour of nanocrystalline NiAl coating was investigated. In this regard, NiAl coatings with different crystalline sizes in the range of 20–110 nm were produced by mechanical alloying, high-velocity oxy-fuel processing (HVOF) and isothermal annealing at 600°C for 0–30 h. The produced and annealed samples were characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The corrosion behaviours of coatings were examined in NaCl 3/5% electrolyte by potentiostat analysis. The nanocrystalline NiAl coating with the average crystalline size of about 20 nm and the porosity content of about 2% was successfully produced by mechanical alloying and HVOF processing. By annealing the coating, the NiAl crystalline sizes increased sharply, approaching a constant value of about 110 nm. It was found that the corrosion resistance of nanocrystalline coating increased with the increase in the crystalline size.

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Authors and Affiliations

  1. Department of Material Engineering, Malek-Ashtar University of Technology, Shahin-Shahr, Isfahan, 84156-83111, Iran

    M TAVOOSI, H HEYDARI, A HOSSEINKHANI & B ADELIMOGHADDAM

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  1. M TAVOOSI
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  2. H HEYDARI
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  3. A HOSSEINKHANI
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  4. B ADELIMOGHADDAM
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Correspondence to M TAVOOSI.

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TAVOOSI, M., HEYDARI, H., HOSSEINKHANI, A. et al. Effects of crystalline growth on corrosion behaviour of nanocrystalline NiAl coating. Bull Mater Sci 38, 895–899 (2015). https://doi.org/10.1007/s12034-015-0944-6

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  • DOI: https://doi.org/10.1007/s12034-015-0944-6

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