Effect of sodium sulfide on hydrogen absorption of Ti-6% Al-4% V alloy
- Tatung Inst. of Tech., Taipei (Taiwan, Province of China). Dept. of Materials Engineering
- National Taiwan Ocean Univ., Keelung (Taiwan, Province of China). Dept. of Marine Materials Engineering
The hydrogenation inhibitive effect of sodium sulfide on Ti-6% Al-4% V alloy (UNS R56400) in aqueous sulfuric acid solution (H{sub 2}SO{sub 4[aq]}) was investigated qualitatively and quantitatively using optical microscopy, x-ray diffraction (XRD), and glow-discharge spectrometry (GDS). Introduction of Na{sub 2}S into the electrolyte resulted in an obvious inhibitive effect of hydrogen absorption on as-received (covered with a thin thermal oxide film < 0.5 {micro}m) and abraded specimens (free of thermal oxide film) irrespective of applied current density and operating period. The contrary effect of Na{sub 2}S on Ti-6% Al-4% V alloy vs ferrous alloys could have resulted from the fact that molecular hydrogen sulfide, which adsorbed on the titanium surface as on the iron surface, facilitated formation of a thin layer of {var_epsilon} titanium hydride (TiH{sub 2}). TiH{sub 2} effectively retarded ingress of hydrogen.
- Sponsoring Organization:
- National Science Council, Taipei (Taiwan, Province of China)
- OSTI ID:
- 495436
- Journal Information:
- Corrosion, Vol. 53, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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