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Abstract
Abstract The hydrogenation inhibitive effect of sodium sulfide (Na2S) on Ti-6% Al-4% V alloy (UNS R56400) in aqueous sulfuric acid solution (H2SO4[aq]) was investigated qualitatively and quantitatively using optical microscopy, x-ray diffraction (XRD), and glow-discharge spectrometry (GDS). Introduction of Na2S into the electrolyte resulted in an obvious inhibitive effect of hydrogen absorption on as-received (covered with a thin thermal oxide film < 0.5 μm) and abraded specimens (free of thermal oxide film) irrespective of applied current density and operating period. The contrary effect of Na2S on Ti-6% Al-4% V alloy vs ferrous alloys could have resulted from the fact that molecular hydrogen sulfide (H2S), which adsorbed on the titanium surface as on the iron surface, facilitated formation of a thin layer of E titanium hydride (TiH2). TiH2 effectively retarded ingress of hydrogen.
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