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Critical Pitting Temperature of 2205 Duplex Stainless Steels Using Immersion and Electrochemical Polarization Test Methods  

Shin Jae-Ho (School of Advanced Materials Engineering, Kookmin University)
Lee Jae-Bong (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Journal of the Korean institute of surface engineering / v.39, no.1, 2006 , pp. 18-24 More about this Journal
Abstract
Although stainless steels have the excellent corrosion resistance by passive film, they are susceptible to pitting corrosion in the environment containing halogen elements such as chloride ions. The resistance to pitting corrosion can be evaluated by measuring the critical pitting temperature (CPT). CPT values can be obtained using immersion, potentiodynamic and potentiostatic polarization test methods. Results on duplex 2205 stainless steels showed that CPT values were measured as $50^{\circ}C,\;55^{\circ}C\;and\;61^{\circ}C$, respectively for immersion, potentiodynamic and potentiostatic polarization test methods, depending upon the different test methods, even though the difference between CPT values are not much.
Keywords
Critical pitting temperature; Immersion test; Potentiostatic polarization; Potentiodynamic polarization; Pitting resistance equivalent index; Pitting potential;
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