Pitting evolution of hyper duplex stainless steel 2707 at nose temperature by electrochemical tests and developed mixed potential model

Sun, Lifei; Chen, Si; Zhao, Tianyu; Qiu, Jie; Li, Weihua; Macdonald, Digby D.

doi:10.1016/j.corsci.2022.110759

Cited by 4 publications

(1 citation statement)

References 53 publications

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“…[2][3][4] Compared to standard DSS 2205, SDSS 2507 and HDSS 2707 have higher Cr and Ni contents, which increases the pitting corrosion resistance, for example, the critical pitting temperature (CPT) in DSS 2205 is 61°C, [5] compared to SDSS 2507 (96°C) and HDSS 2707 (>100°C). [6,7] To test the pitting corrosion performance of corrosionresistant HDSS, traditionally electrochemistry-based corrosion test methods with potentiostatic/dynamic polarisation are used as well as other techniques such as electrochemical impedance spectroscopy (EIS), or simple immersion tests, which need controlled hightemperature environments, typically probing up to the reported CPTs. [8][9][10] Bipolar electrochemistry is an innovative method used for evaluating corrosion.…”

Section: Introductionmentioning

confidence: 99%

A rapid corrosion screening technique for grade 2707 hyper‐duplex stainless steel at ambient temperature

Zhou,

Cao,

Mahmood

et al. 2023

Materials & Corrosion

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The pitting corrosion behaviour of 27%Cr–7%Ni (2707) hyper‐duplex stainless steel (HDSS) at ambient temperature has been assessed using a novel bipolar electrochemistry test set‐up. Application of this technique generates a linear potential gradient at the surface of the HDSS 2707 test piece, which allows assessment of the pitting corrosion behaviour at ambient temperature. Pit nucleation and associated growth kinetics can be obtained and characterised. To assess pitting corrosion in high‐alloyed HDSS, the normal bipolar test method had to be modified by superimposing an auxiliary potential. This new test set‐up was demonstrated by characterising the nucleation of pits and associated pit growth kinetics. The latter occurred either at austenite/ferrite interphase or inside ferrite phase, with pit growth within the ferrite phase in the HCl environment.

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