Strain-induced reactivation of corrosion pits in austenitic stainless steel. (15th August 2017)

• Record Type: Journal Article
• Authors: Almuaili, F.A.; McDonald, S.A.; Withers, P.J.; Cook, A.B.; Engelberg, D.L.
• Is Part Of: Corrosion science. Volume 125(2017)
• Page Start: 12
• Page End: 19
• Publication Date: 2017-08-15
• Subjects: A. Stainless steel -- B. Electrochemical polarisation -- B. Time-lapse X-ray computed tomography -- C. Pitting corrosion -- C. Reactivation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2017.05.023
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Strain-induced reactivation of a corrosion pit was observed, in-situ. Pit stability products and 3D pit growth kinetics were estimated. Applied strain resulted in diffusivity parameter ( Deff Δ C ) of 4.5 × 10 −8 mol cm −1 s −1 . Lacy metal cover fractures were observed. 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 eff Δ C ) from 3.0 × 10 −8 mol cm −1 s −1 to 4.5 × 10 −8 mol cm −1 s −1 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.