Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 39, Issue 10, Pages 1703-1708Publisher
SPRINGER
DOI: 10.1007/s10800-009-9863-9
Keywords
Duplex stainless steel; Pitting corrosion; Critical pitting temperature; Temperature change rate; The point defect model
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Funding
- National Natural Science Foundation of China [10621063, 50871031]
- Chinese National Science and Technology Infrastructure Platforms Construction Project [2005DKA10400-Z13]
- Shanghai Science and Technology Development Funds [0725nm004]
- China Postdoctoral Science Foundation [20080430670]
- Shanghai Leading Academic Discipline Project [B113]
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The effect of temperature change rate on the critical pitting temperature (CPT) for two kinds of duplex stainless steels (DSS, namely UNS S31803 and UNS S32750) in 1 mol L-1 NaCl solution was investigated using the potentiostatic current transient technique. The values of CPT for two DSSs all increased as the temperature change rate (upsilon) increased. A linear relationship between the CPT and the square root of temperature change rate (upsilon(1/2)) was found. Furthermore, deriving from the point defect model (PDM), this particular relationship received theoretical support at low temperature change rates.
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