Stress Corrosion Cracking. Between the Corrosion Defect and the Long Crack: the Phase of the Initiation of the Cracks

Blanc, Christine; Creus, Juan; Touzet-Cortina, Marie

doi:10.1016/b978-1-78548-309-7.50013-2

Cited by 4 publications

(2 citation statements)

References 57 publications

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“…It is accepted that, in most cases, a macroscopic scratch will possess increased corrosion susceptibility compared to the rest of the metallic surface, predominantly due to induced micro-fractures in the material that act as initiation sites for corrosion-related processes. 81,82 Although the corrosion-action of several different kinds of physical deformation have been the subject of macroscopic electrochemical investigation and surface analysis techniques, 83–85 the role of microscopic defects, such as scratches introduced by fine polishing, is still largely unknown. SECCM enables electrochemical activity to be probed at a commensurate scale to microscopic surface defects.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale electrochemistry in a copper/aqueous/oil three-phase system: surface structure–activity-corrosion potential relationships

Daviddi

Shkirskiy

Kirkman³

et al. 2021

Chem. Sci.

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Section: Resultsmentioning

confidence: 99%

Nanoscale electrochemistry in a copper/aqueous/oil three-phase system: surface structure–activity-corrosion potential relationships

Daviddi

Shkirskiy

Kirkman³

et al. 2021

Chem. Sci.

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“…This can lead to the formation of tiny corrosion-induced cracks, often detectable only under a microscope. During regime II, when small cracks expand, the corrosive agents attack the crack tips, promoting rapid material degradation and creating a favourable environment for crack growth [50]. Cracks can spread more quickly and deeply compared to non-corrosive conditions, posing a significant threat to material integrity [51].…”

Section: Environmental Fracturementioning

confidence: 99%

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Alqahtani,

Starr,

Khan

2024

Metals

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Aluminium alloys have been integral to numerous engineering applications due to their favourable strength, weight, and corrosion resistance combination. However, the performance of these alloys in coastal environments is a critical concern, as the interplay between fracture toughness and fatigue crack growth rate under such conditions remains relatively unexplored. This comprehensive review addresses this research gap by analysing the intricate relationship between fatigue crack propagation, fracture toughness, and challenging coastal environmental conditions. In view of the increasing utilisation of aluminium alloys in coastal infrastructure and maritime industries, understanding their behaviour under the joint influences of cyclic loading and corrosive coastal atmospheres is imperative. The primary objective of this review is to synthesise the existing knowledge on the subject, identify research gaps, and propose directions for future investigations. The methodology involves an in-depth examination of peer-reviewed literature and experimental studies. The mechanisms driving fatigue crack initiation and propagation in aluminium alloys exposed to saltwater, humidity, and temperature variations are elucidated. Additionally, this review critically evaluates the impact of coastal conditions on fracture toughness, shedding light on the vulnerability of aluminium alloys to sudden fractures in such environments. The variability of fatigue crack growth rates and fracture toughness values across different aluminium alloy compositions and environmental exposures was discussed. Corrosion–fatigue interactions emerge as a key contributor to accelerated crack propagation, underscoring the need for comprehensive mitigation strategies. This review paper highlights the pressing need to understand the behaviour of aluminium alloys under coastal conditions comprehensively. By revealing the existing research gaps and presenting an integrated overview of the intricate mechanisms at play, this study aims to guide further research and engineering efforts towards enhancing the durability and safety of aluminium alloy components in coastal environments.

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Crack initiation during environment-induced cracking of metals: current status

Holroyd,

Burnett,

Lewandowski

et al. 2024

Corrosion Reviews

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Environment-induced cracking (EIC) research spanning the last 80 years for ferrous and non-ferrous metals in aqueous environments at ambient and elevated temperatures has concentrated on crack propagation. Studies clearly reveal EIC involves two differentiable processes, one controlling initiation and the other propagation. Utilization of advanced high-resolution electron microscopy over the last 20 years has enabled more focused studies of crack initiation for stainless steel and nickel-based alloys at elevated temperatures exposed to environments associated with the nuclear industry. More recently, when coupled with advanced in-situ experimental techniques such as time-lapse X-ray computed 3D-tomography, progress has also been made for aluminum alloys suffering EIC at ambient temperatures. Conventional wisdom states that chemical processes are typically rate-controlling during EIC initiation. Additionally, experimental evidence based on primary creep exhaustion ahead of the introduction of an aggressive environment indicates that time-dependent mechanically-driven local microstructural strain accommodation processes (resembling creep-like behavior) often play an important role for many metals, even for temperatures as low as 40 % of their melting points (0.4 Tm). EIC studies reveal initial surface conditions and their associated immediate sub-surface alloy microstructures generated during creation (i.e. disturbed layers) can dictate whether or not EIC initiation occurs under mechanical loading conditions otherwise sufficient to enable initiation and growth. The plethora of quantitative experimental techniques now available to researchers should enable significant advances towards understanding EIC initiation.

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Stress Corrosion Cracking. Between the Corrosion Defect and the Long Crack: the Phase of the Initiation of the Cracks

Cited by 4 publications

References 57 publications

Nanoscale electrochemistry in a copper/aqueous/oil three-phase system: surface structure–activity-corrosion potential relationships

Nanoscale electrochemistry in a copper/aqueous/oil three-phase system: surface structure–activity-corrosion potential relationships

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Crack initiation during environment-induced cracking of metals: current status

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