The corrosion behavior of niobium and Nb–25 wt% Ta alloy in H2 SO4 solutions has been studied. Using mass-loss techniques, the influences of H2SO4 concentration, temperature, and exposure time have been examined. The Nb–Ta alloy is more corrosion resistant than pure niobium. The obtained corrosion data allowed the construction of iso-corrosion curves of both materials in sulfuric acid below and above the boiling point.

Subject
Materials, Tantalum, Corrosion resistant alloys, Hydrogen concentration, Acid concentration, Corrosion rate, Glass, Sulfuric acid, Corrosion testing, Polytetrafluoroethylene, Niobium, Corrosion resistance, Alloys
Keywords:
corrosion, niobium, passivation, refractory metals, sulfuric acid, tantalum
National Association of Corrosion Engineers
1991
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