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Effect of Ferric Ion on Corrosion Resistance of Zirconium in Hcl- alcl3 Environment.
Riley-WD; Covino-BS Jr.
MISSING :15 pages
In order to evaluate the corrosion resistance of zirconium in mineral extraction processes, such as clay-hydrochloric acid leaching process for extracting alumina, the Bureau of Mines conducted corrosion studies in hcl-alcl3-fecl3 environments. A series of weight loss and electrochemical tests were conducted at 25 deg and 65 deg c in aluminum chloride (alcl3) plus hydrochloric acid (hcl) solutions containing 0 to 1,000 ppm ferric ion. It was determined that zirconium, which normally exists in a passive state in chloride-containing solutions, undergoes pitting attack in solutions containing more than 100 ppm of ferric ion. It is also shown that an oxide film prepared in air at high temperature offers protection in acid solutions containing levels of ferric ion from 300 to 1,000 ppm.
IH; Report of Investigations