Immersion tests have confirmed that, in the pH range 4·5–7·0, lead azelate is a more efficient inhibitor for iron than sodium azelate.
It has been shown, by means of14C labelled lead azelate, that during inhibition azelate ions became firmly bound to the oxide covered iron surface, probably in the form of ferric azelate and, by means of 210pb, that this was accompanied by the cathodic deposition of lead at breaks in the oxide film.
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References
1.
MayneJ. E. O., & RamshawE. H., J. appl. Chem., Load., 1963, 13, 553
2.
MayneJ. E. O., & RamshawE. H., ibid., 1960, 10, 419
