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Effect of halide ions on the nucleation of corrosion pits in iron
Author(s) -
JanikCzachor Maria
Publication year - 1979
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19790300405
Subject(s) - halide , nucleation , chloride , ion , inorganic chemistry , corrosion , chemistry , kinetics , logarithm , materials science , metallurgy , physics , organic chemistry , mathematical analysis , mathematics , quantum mechanics
The kinetics of the pit nucleation in iron in borate buffer solution containing bromides and iodides (0.01 n–0.5 n) has been investigated, and the results have been compared with those obtained for chloride solutions. It has been found that the critical pitting potential, E cp , decreases linearly with the logarithm of the halide concentration. At constant potential, E, the logarithm of the induction period of pit nucleation decreases linearly with the reciprocal of the potential difference ΔE = E‐E cp . The mechanism of the aggressive action of the halide ions on the passive film is discussed.