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Electroplating of Al-Zr alloys in AlCl3-NaCl-KCl molten salts to improve corrosion resistance of Al

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Abstract

To improve the corrosion resistance of Al in chloride solutions, electrodeposition of Al-Zr alloys of various compositions was carried out at 448 K by constant potential control in AlCl3-NaCl-KCl molten salt containing ZrCl4. Cathodic reduction of the Zr ions starts at a potential of 0.4 V vs. Al/Al(III) in the molten salt. The electrodeposition of Al and Zr occurred at potentials more negative than −0.02 V. The concentration of Zr in the electrodeposit increased to 23 at.% at −0.02 V. In the XRD analysis, the electrodeposits formed at −0.05 to −0.15 V had good crystallinity, the electrodeposits containing higher concentrations of Zr formed at −0.02 or −0.04 V show an amorphous or fine crystal structure. The pitting potentials of Al-Zr alloys containing 5–23 at.% Zr in 0.1 M NaCl solution shifted from +0.1 to +0.3 V compared with those of pure Al.

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Authors and Affiliations

  1. Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan

    Mikito Ueda, Tsubasa Teshima, Hisayoshi Matsushima & Toshiaki Ohtsuka

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  1. Mikito Ueda
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  2. Tsubasa Teshima
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  3. Hisayoshi Matsushima
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  4. Toshiaki Ohtsuka
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Correspondence to Mikito Ueda.

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Ueda, M., Teshima, T., Matsushima, H. et al. Electroplating of Al-Zr alloys in AlCl3-NaCl-KCl molten salts to improve corrosion resistance of Al. J Solid State Electrochem 19, 3485–3489 (2015). https://doi.org/10.1007/s10008-015-2861-4

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  • DOI: https://doi.org/10.1007/s10008-015-2861-4

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