Hydride Formation on Ti<SUB>3</SUB>Al by Cathodic Hydrogen Charging in Sulfuric Acid Containing Sb<SUB>2</SUB>O<SUB>3</SUB>

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  • Sb<SUB>2</SUB>O<SUB>3</SUB>を添加した硫酸中でのカソード水素チャージによってTi<SUB>3</SUB>Alに形成された水素化物
  • Sb2O3を添加した硫酸中でのカソード水素チャージによってTi3Alに形成された水素化物
  • Sb2O3 オ テンカ シタ リュウサン チュウ デ ノ カソード スイソ チャージ ニ ヨッテ Ti3Al ニ ケイセイ サレタ スイソカブツ

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Abstract

Formation of metal-hydride (MH) on the Ti3Al surface by charging hydrogen (H) electrochemically in sulfuric acid with 0.5 g/m3 Sb2O3 as a hydrogen recombination poison has been studied by X-ray diffractometry (XRD) and thermal desorption spectrometry (TDS) combined with quadrupole mass spectrometry (QMS).<BR>The two types of hexagonal phase were found in the XRD diagram after the cathodic charging (CP) for 1 h. The one is the α2 phase and the other is a MH phase which has lattice parameters of a=0.588 nm and c=0.794 nm.<BR>Two peaks at 600°C and 700°C in the curves of TDS and QMS corresponded to desorption of hydrogen. The measurement of XRD after heating at various temperatures showed that the MH phase with a hexagonal structure decompose at 600°C and that the hydrogen in α2 phase discharges at 700°C.<BR>The MH phase formed in Ti3Al is not considered to be the same substance with the hexagonal type of a MH phase formed on TiAl which was previously reported.

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