Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 69, Issue 1, Pages 44-52Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.201709641
Keywords
CPT; critical pitting temperature; potentiodynamic; potentiostatic; PREN
Funding
- National Natural Science Foundation of China [51371053, 51501041, 51671059]
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Temperature and potential effect on pitting occurrence of four austenitic stainless steels in 1Msodium chloride solution are plotted, then the influence of scan rate and chloride concentration on potentiodynamic critical pitting temperature (CPT) are investigated. Basing on the independence and reliability analysis, the potentiodynamic CPT and potentiostatic CPT are compared. To improve the reproducibility of potentiostatic CPT, an elevated potential should be applied. On the other hand, crevice corrosion induced by transpassive etching is clarified, indicating the upper limit of applied potential in potentiostatic test. Consequently, a potential of 800 or 850 mV(SCE) is recommended for austenitic stainless steels. Additionally, regression analysis is carried out to confirm the linear relationship between potentiodynamic CPT and pitting resistance equivalent.
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