The role of iron-carbon galvanic contact in the formation of dispersed iron hydr(oxides) in water and electrolyte solutions

The comparative analysis of phase formation on the iron surface in aqueous medium in the presence and absence of iron-carbon (coke) galvanic contact w as carried out. The role of galvanic contact in phase formation processes w as determined. It was shown that, in the presence of galvanic contact almos t complete oxidation of iron ions on the surface of an iron half-element an d a rather efficient stationary formation of dispersed phases serving as so rbents of heavy metals from solutions take place. The effect of anionic com position of solution on the parameters of phase formation was studied. It w as established that maximal amount of iron-oxygen-containing phases is form ed in zinc chloride solution. The presence of sulfate and nitrate ions in s olution decreased significantly the rate of phase formation in iron-carbon galvanic contact.