Improvement of resistance of TiAl alloy against high temperature oxidation by electroplating in AlCl3–NaCl–KCl–CrCl2 molten salt

Ueda, Mikito; Susukida, Daigo; Konda, Shoichi; Ohtsuka, Toshiaki

doi:10.1016/s0257-8972(03)00512-7

Cited by 23 publications

(14 citation statements)

References 21 publications

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“…The authors have proposed a resistive coating of Al alloy layers produced by electroplating of substrates with molten salt [7][8][9]. There have been a number of papers on the formation of alloy electrodeposits of Al-Cr, Al-Ni, AlMn, and Al-Ti with low-temperature molten salts [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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

Ueda

Teshima

Matsushima

et al. 2015

J Solid State Electrochem

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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 AlCl 3 -NaCl-KCl molten salt containing ZrCl 4 . 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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Section: Introductionmentioning

confidence: 99%

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

Ueda

Teshima

Matsushima

et al. 2015

J Solid State Electrochem

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“…Different diffusion barrier coatings have been developed. The processes for developing Al-rich coatings on c-TiAl based alloys include pre-oxidation [11], pack cementation [12][13][14][15][16], magnetron sputtering [16][17][18][19][20][21], low-pressure plasma spray [22], and electroplating [23]. In the most of these Al-rich coatings, the TiAl 3 intermetallic is the most important constituent because it is capable of Al 2 O 3 formation at high temperatures due to its high Al content.…”

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confidence: 99%

Improvement of Oxidation Resistance of γ-TiAl at 900 and 1000 °C Through Hot-dip Aluminizing

et al. 2009

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Hot-dip aluminizing method and subsequent interdiffusion treatment were used to develop a TiAl 3 coating on Ti-45Al-2Cr-2Nb-0.15B (at.%) alloy. A two-phase coating consisting of an outer pure Al layer and an inner TiAl 3 layer formed on the alloy after the hot-dip and then a single phase TiAl 3 coating was obtained by using interdiffusion treatment. Oxidation of the TiAl 3 coating was conducted at 900 and 1000°C. Both the interrupt oxidation and the isothermal oxidation tests indicated that the coating provided high protectiveness for the alloy. The coating was stable for at least 300 h during the interrupt oxidation at 900 and 1000°C, and it was stable for at least 500 h at 1000°C and 1000 h at 900°C during the isothermal oxidation. The oxidation behavior of the coating was discussed in detail.

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“…[5][6][7] To prepare a uniform and thin coating on the substrate with low production costs, electrolysis was applied in a low-temperature molten salt for the formation of the coating. There have been a number of papers on the formation of alloy electrodeposits of Al-Cr, Al-Ni, Al-Mn, and Al-Ti from low-temperature molten salts [8][9][10][11][12][13]; however, no papers of electrodeposition of Al-Sn alloys have been located.…”

Section: Introductionmentioning

confidence: 99%

Composition and structure of Al–Sn alloys formed by constant potential electrolysis in an AlCl3–NaCl–KCl–SnCl2 molten salt

Ueda

Inaba

Ohtsuka

2013

Electrochimica Acta

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To form Al-Sn alloys for bearing materials, molten salt electrolysis was performed in an AlCl 3 -NaCl-KCl molten salt containing SnCl 2 at 423 K. The voltammogram showed that the cathodic reduction of the Sn ions started at a potential of 0.5 V vs.Al/Al(III) in the molten salt showing that deposition of pure Sn was possible at 0.5 V.Co-deposition of Al and Sn occurred at potentials more negative than 0.1 V. The co-deposit was composed a solid solution of Al and Sn. The ratio of the Sn in the electrodeposits decreased with the potential from 100 at% at 0.2 V to 19 at% at -0.3 V.In the structural observations, electrodeposits with an alternate stacked structure of Al and Sn is obtained at -0.075V.

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Improvement of resistance of TiAl alloy against high temperature oxidation by electroplating in AlCl3–NaCl–KCl–CrCl2 molten salt

Cited by 23 publications

References 21 publications

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

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

Improvement of Oxidation Resistance of γ-TiAl at 900 and 1000 °C Through Hot-dip Aluminizing

Composition and structure of Al–Sn alloys formed by constant potential electrolysis in an AlCl3–NaCl–KCl–SnCl2 molten salt

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