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Studies on the Pitting Corrosion of the Delta-52 Steel in aqueous solutions. 2. Variation of the pitting potential in relation to the concentration of the aggressive anion

✍ Scribed by S. M. Abd El Haleem; S. S. Abd El Reheem; M. Sh. Shalaby; A. M. Azzam

Publisher
John Wiley and Sons
Year
1976
Tongue
German
Weight
764 KB
Volume
27
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

Potentiodynamic anodic polarization curves have been traced for an electrode of the steel Delta‐52 (0.40, 0.78Mn, 0.045 S, 0.06P, 0.23 Si): the aggresive media used were potassium hydroxide without and with additions of potassium chloride, bromide and iodide. The oxide film present on the steel surface does not inhibit active dissolution; only at potentials exceeding+2 (S. C. E.) passivity sets in. The polarization behaviour of the steel is not influenced by the addition of the halide salts; above a certain salt concentration, however, there is a sharp increase in dissolution current. This phenomenon is an indication of the start of pitting. Between the pitting potential and the anion concentration there exists a well defined relation.

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