Electrodeposition of Titanium from Aqueous Solution of Hexafluotitanate

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  • 六弗化チタン酸アンモニウム水溶液からのチタンの電解析出機構について
  • ロク フッカ チタンサン アンモニウム スイヨウエキ カラ ノ チタン ノ デンカイ セキシュツ キコウ ニ ツイテ

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Cathodic potential measurements on Pt, Cu, Ti, Zn, and Al electrodes were carried out at various current densities in aqueous solution of (NH4)2TiF6. The solution contains the cations Ti4+, NH4+ and H+, and the anions TiF6−−, F− and OH− according to the following equations:<BR>(This article is not displayable. Please see full text pdf.) <BR>Though Ti4+ ions begin to be reduced at about −0.8 V (vs. S.C.E.), the potential where the titanium deposition becomes visible is less noble than −1.1∼−1.2 V. The mechanism of the electrodeposition of titanium is either the direct discharge of Ti4+ ions or the reduction of titanium ions of lower valency such as Ti3+ or Ti2+ to metallic titanium by active hydrogen, but since a simultaneous evolution of hydrogen with the deposition of titanium was observed, the mechanism could not be identified in the present experiments.

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