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Cook, Anthony
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article
Strain-induced Reactivation of Corrosion Pits in Austenitic Stainless Steel
Abstract
The reactivation of a corrosion pit under the synergetic effect of strain and electro-chemical polarisation has been observed in a type 304L stainless steel using X-ray computed tomography. The pit reactivation process was associated with the formation of a new pit, directly adjacent to a pre-existing pit. Pit growth kinetics were estimated, revealing an increase of the diffusivity parameter (D<sub>eff</sub> ΔC) from 3.0x10<sup>-8</sup> mol.cm<sup>-1</sup>.s<sup>-1 </sup>to 4.5x10<sup>-8</sup> mol.cm<sup>-1</sup>.s<sup>-1</sup> with the application of strain, indicating higher metal dissolution rates. Applied strain resulted in fractured lacy metal covers, and its effect on pit growth kinetics is discussed.