The Pitting Potential of Stainless Steels in Chloride Media

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Abstract
Anodic and cathodic potentiostatic polarization curves were obtained for various stainless steel alloys in sodium chloride and calcium chloride solutions. In the pH range 2 to 8 pitting occurs in the passive region. For a given chloride ion concentration pit initiation does not occur until a certain electrode potential, the pitting potential, is reached. The pitting potential is dependent on alloy composition and may be used as a relative measure of pitting tendency for various alloys. Calcium ion enobles the pitting potential when the chloride ion concentration is about 1N or less. The implications of a pitting potential on passivity theories is briefly discussed.

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