Single crystals of iron produced by strain-anneal method and whiskers obtained by reduction of ferrous chloride with hydrogen were investigated as regards the stationary corrosion potential, cathodic and anodic polarization, general corrosion, and stress corrosion cracking in 5 N ammonium nitrate solution.

The results reveal intergranular corrosion of iron in ammonium nitrate solution as primarily due to differences in electrochemical properties between various crystal faces as well as grain boundaries, and, particularly, to differences in ability to become passive. Apparently, under certain conditions, intense currents flow between grains and grain boundaries in contact with the electrolyte, and this results in a heavy local attack.

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© 1964 National Association of Corrosion Engineers
1964
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