Abstract
The corrosion behavior of iron-chromium-nickel alloys in 48%NaOH solutions containing NaClO3 and NaCl was investigated mainly by means of potentiodynamic polarization and measurement of the average penetration at temperatures between 140 and 200°C, and the following results were obtained. In 48%NaOH solutions containing NaClO3, anodic dissolution of iron-chromium-nickel alloys in the active state decreased with increasing the nickel and chromium content, and the NaClO3 content. However, the anodic dissolution as NiO22− ion at a low potential of Eh=−0.65 V was unchanged with and without NaClO3 in NaOH solutions. Then, the natural electrode potential of the alloys showed a noble potential with increase in the NaClO3 content. The immersion test showed that the alloys containing low chromium had a comparatively good corrosion resistance by addition of nickel in alkaline solutions containing NaClO3, but high chromium alloys having self-passivation ability decreased the corrosion resistance by addition of Ni in those solutions. The effect of NaClO3 on corrosion of the alloys is caused by its oxidation power. The corrosion behavior of iron-chromium-nickel alloys was invariable in 48%NaOH solutions when the NaCl content was less than 1%.
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