DISSOLUTION RATES OF ZONE REFINED IRON AND STEEL IN HCL, H2S04 AND NACL AQUEOUS SOLUTIONS
MISSOURI UNIV-ROLLA SCHOOL OF MINES AND METALLURGY
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Zone refinded iron is slowly attacked by acids. Rates obtained in 0.5 N H2S04 and HCl are 0.056 and 0.023 mgsq. cmhr respectively at 25 C in the presence of air. In hydrogen the dissolution rates are slower. In a 3 NaCl solution the rate is about one fifth of that in 0.5 N HCl. The order of reaction starting with I N H2SO4 is above 2, indicating that the rate is unduly slowed down at low concentrations of the acid and that the resistance to corrosion decreases with increasing concentration of the acid. The dissolution rates of two steels containing among other impurities 0.44 and 0.85 C respectively, were determined in various concentrations up to 7 N of H2SO4 and HCl as a function of temperature between 15 and 25 C.
- Inorganic Chemistry