Abstract
The corrosion behaviours of Fe-24Cr-6V alloys containing 0.12, 0.24, and 0.35wt% Ru additions in non-oxidizing acid solutions were studied by means of the electrochemical and Auger electron spectroscopic techniques. The weight-loss measurements show that the addition of Ru to the Fe-24Cr-6V alloy in the composition range 0.12 to 0.35% is very effective in increasing the corrosion resistance of this alloy in a 5% H2SO4 acid solution at 70 and 98°C, respectively. Also, the addition of Ru to the Fe-24Cr-6V alloy is found to be beneficial in the concentration range 0.24 to 0.35% range when the alloy is exposed to 5% HCl solution at 70 and 98°C, respectively. AES results reveal that the spontaneously passivated films formed on the Fe-24Cr-6V-Ru alloy system in 5% HCl solution at 25°C are enriched in chromium and vanadium but depleted in ruthenium.
