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Author(s): Z. Y. Chen & R. G. Kelly
Abstract:
An analytical method for evaluating the stability of pitting corrosion of
corrosion-resistant alloys under thin-layer (or atmospheric) conditions is
presented.
The method uses input data that are either thermodynamic in nature
or easily obtained experimentally.
The maximum cathode current available
(referred to as the cathode capacity) depends on the cathode geometry,
temperature, relative humidity, deposition density of salt (i.e., mass of salt per
unit area of cathode), and interfacial electrochemical kinetics.
The anode demand
depends on the pit geometry and the pit stability product.
By coupling these two
approaches, the stability of a pit can be determined for a given environmental
scenario.
The method has been applied to the atmospheric pitting corrosion of
Type 316L stainless steel, leading to a quantitative description of limiting stable
pit sizes.
Keywords:
galvanic corrosion, relative humidity, NaCl particles, localized
atmospheric corrosion, stainless steel, pitting.
1 Introduction:
Corrosion resistant materials exposed to marine atmospheric conditions can
suffer from localized corrosion (pitting, crevice corrosion, stress-corrosion
cracking).
The stability of such a localized corrosion site requires that the site
(anode) must dissolve at a sufficiently high rate to maintain its critical chemistry
[1] and a wetted surrounding area (cathode) must provide a matching cathodic
...
Pages: 9
Size: 467 kb
Paper DOI: 10.2495/ECOR070041
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