Strain-induced reactivation of corrosion pits in austenitic stainless steel

Al-Muaili, Fahd; McDonald, S.A.; Withers, Philip J.; Cook, Anthony; Engelberg, Dirk

doi:10.1016/j.corsci.2017.05.023

Cited by 50 publications

(17 citation statements)

References 44 publications

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“…In the often corrosion-prone occluded regions of complex-shaped components, the detection of the attack can be difficult [8], and the evaluation of its intensity becomes especially complex. Local changes in the initial microstructure of the stainless steels and strain concentrations induced during the forming process [1,9], or the treatment of the surface [10], caused by the thermo-mechanical assembly of the components [11] or generated during service exposure [12], can decrease the passive film's stability. Chromium carbide grain boundary precipitation (associated with sensitizing), as well as other undesired phase precipitation, can also be a problem for welded stainless-steel components [11,13].…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

Monrrabal

Ramírez-Barat²,

Bautista

et al. 2018

Metals

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Corrosion can be a problem for stainless steels in chloride-containing or other aggressive environments, especially when they are formed as components with complex shapes. Monitoring the corrosion performance of the stainless steels during their in-service life is not always an easy task. Traditional electrochemical cells can be difficult to adapt to complex surfaces, and undesired crevices or liquid electrolyte leaks can occur. In the presented work, the possible use of non-destructive techniques with innovative gel electrolytes was investigated using portable cells. The electrolytes were based on agar (used as a gelling agent with ionic conductivity), glycerol (a plasticizer that improves adaptability to complex surfaces), and NaCl or KClO 4 salts (which improve the conductivity and control the aggression of the tests). X-ray photoelectron spectroscopy (XPS) and Mott-Schottky analysis were carried out to obtain information about the influence of the electrolyte on the passive layer. The oxygen concentration and conductivity in the gels with various glycerol contents were compared to those in liquid electrolytes. Electrochemical impedance spectroscopy (EIS) measurements were carried out in liquids and gels. The performance of the gel cell on a stainless-steel component with a weld and complex shape was checked. The variation in the sensitivity of gels with and without chlorides to identify corrosion-susceptible regions was tested.

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Section: Introductionmentioning

confidence: 99%

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

Monrrabal

Ramírez-Barat²,

Bautista

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…Stainless steels find wide applications in industry because they have good corrosion resistance and mechanical strength and are of low costs [1][2][3]. The corrosion resistance of this type of materials is believed to be associated with the existence of a stable oxide film on the surface, which is rich in chromium [4,5]. This thin film makes the steel surface passive in many environments.…”

Section: Introductionmentioning

confidence: 99%

Effect of sliding conditions on micropitting behaviour of AISI 304 stainless steel in chloride containing solution

Sun

Bailey

2018

Corrosion Science

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“…threshold segmentation. 19,69 The corroded surface area of the wire was normalised by dividing the determined corrosion area by the total scanned area of the wire surface to compensate for different volumes/areas of wires to compare with different scans. The normalised corrosion volume was obtained by dividing the lost volume by the total measured volume of the wire.…”

Section: Corrosion Testingmentioning

confidence: 99%

Time-dependent in situ measurement of atmospheric corrosion rates of duplex stainless steel wires

et al. 2018

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Corrosion rates of strained grade UNS S32202 (2202) and UNS S32205 (2205) duplex stainless steel wires have been measured, in situ, using time-lapse X-ray computed tomography. Exposures to chloride-containing (MgCl 2 ) atmospheric environments at 50°C (12-15 M Cl − and pH~5) with different mechanical elastic and elastic/plastic loads were carried out over a period of 21 months. The corrosion rates for grade 2202 increased over time, showing selective dissolution with shallow corrosion sites, coalescing along the surface of the wire. Corrosion rates of grade 2205 decreased over time, showing both selective and pitting corrosion with more localised attack, growing preferentially in depth. The nucleation of stress corrosion cracking was observed in both wires.

show abstract

Strain-induced reactivation of corrosion pits in austenitic stainless steel

Cited by 50 publications

References 44 publications

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

Non-Destructive Electrochemical Testing for Stainless-Steel Components with Complex Geometry Using Innovative Gel Electrolytes

Effect of sliding conditions on micropitting behaviour of AISI 304 stainless steel in chloride containing solution

Time-dependent in situ measurement of atmospheric corrosion rates of duplex stainless steel wires

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