Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid

Skilbred, Ellen Synnøve; Palencsár, Simona; Dugstad, Arne; Johnsen, Roy

doi:10.1016/j.corsci.2022.110172

Cited by 11 publications

(1 citation statement)

References 27 publications

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“…In particular, the effect of the side surface layer of corrosion products in the mechanism of PESCC in different Mg alloys is to be elucidated. Furthermore, some other materials, e.g., structural steels and Ti alloys, experience appreciable embrittlement after pre-exposure to aggressive environments [ 48 , 49 , 50 , 51 ]. This embrittlement is generally accepted to be due to diffusible hydrogen, which, however, plays a less important role in PESCC of Mg alloys, as was shown above.…”

Section: Resultsmentioning

confidence: 99%

Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution

et al. 2022

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The preliminary exposure of Mg alloys to corrosion solutions can cause their embrittlement. The phenomenon is referred to as pre-exposure stress corrosion cracking (PESCC). It has been reported that relatively long storage in air after pre-exposure to the corrosion solution is capable of eliminating PESCC. This effect was attributed to the egress of diffusible hydrogen that accumulated in the metal during pre-exposure. However, recent findings challenged this viewpoint and suggested that the corrosion solution retained within the side surface layer of corrosion products could be responsible for PESCC. The present study is aimed at the clarification of the role of hydrogen and the corrosion solution sealed within the corrosion products in the “healing” effect caused by post-exposure storage in air. Using the slow strain rate tensile (SSRT) testing in air and detailed fractographic analysis of the ZK60 specimens subjected to the liquid corrosion followed by storage in air, we found that PESCC was gradually reduced and finally suppressed with the increasing time and temperature of air storage. The complete elimination of PESCC accompanied by recovery of elongation to failure from 20% to 38% was achieved after 24 h of air storage at 150–200 °C. It is established that the characteristic PESCC zone on the fracture surface is composed of two regions, of which the first is always covered by the crust of corrosion products, whereas the second one is free of corrosion products and is characterised by quasi-brittle morphology. It is argued that the corrosion solution and hydrogen stored within the corrosion product layer are responsible for the formation of these two zones, respectively.

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