High contrast corrosion mapping of dissimilar metal weld joints using alternating current scanning electrochemical microscopy: A case study with Zr-4–Ti–304L SS weld

Pal, Ankita; Krishna, Nanda Gopala; Shankar, A. Ravi; Philip, John

doi:10.1016/j.corsci.2023.111345

Cited by 7 publications

(3 citation statements)

References 31 publications

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“…The UME can be used amperometrically or potentiometrically while scanned close to the substrate’s surface to collect local current or potential maps of the metal studied. There are different operating modes of SECM that have been used to study corroding metals, including feedback mode, , generation-collection mode, , redox competition mode, , AC mode, , and potentiometric mode. , The use of SECM in corrosion science has been reviewed by many authors over the past decade. − …”

Section: Introductionmentioning

confidence: 99%

Effect of Redox Mediators on Corrosion Behavior and Scanning Electrochemical Microscopy Response

Mena-Morcillo,

Ebrahimzadeh Pilehrood,

Moshrefi

et al. 2024

Anal. Chem.

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Scanning electrochemical microscopy (SECM) is widely used to measure local electrochemical reactivity of corroding surfaces. A major criticism of using SECM in feedback mode for corrosion studies is the requirement of an external redox mediator (RM) as it could react with the metal and affect the Nernst potential at the metal–solution interface. Consequently, it becomes challenging to differentiate the interference caused by the RM from the local reactivity of the metal. Herein, a multiscale electrochemical approach is presented to investigate the effect of RM choice on the corroding substrate. Two common RMs, ferrocenemethanol and hexaammineruthenium(III) chloride, were used to perform SECM over copper and aluminum. It was found during macroscale electrochemical measurements that Ru(NH)6 3+ acted as an oxidant and promoted corrosion. The SECM feedback behavior varied for copper depending on the RM used, suggesting that the corrosion reactions controlled the negative feedback mechanism, not the formation of an insulating passive film. The passivated aluminum surface consistently exhibited negative feedback, regardless of the RM used. SECM approach curves also displayed a distortion in the steady state current, which was caused by the deposition of substrate-generated species on the microelectrode. These deviations in feedback response were accounted for during analysis through incorporation into a finite element model to accurately extract the RM kinetic rate constants. The importance of understanding these processes is highlighted to avoid misinterpretation of passive behavior and advances toward a more quantitative use of SECM for corrosion studies.

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Section: Introductionmentioning

confidence: 99%

Effect of Redox Mediators on Corrosion Behavior and Scanning Electrochemical Microscopy Response

Mena-Morcillo,

Ebrahimzadeh Pilehrood,

Moshrefi

et al. 2024

Anal. Chem.

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“…While microscale techniques such as SECM 35 give more insights to localized corrosion behavior, the entire sample needs to be immersed in the electrolyte solution in which is it is hard to profile corrosion behavior as a function of time. Since the intrinsic microstructural character of each process zone determines its electrochemical response, SECCM-based local probing is appropriate for characterizing different corrosion/electrochemical responses from each process zone to identify the accurate corrosion mechanism and allow us to design new corrosion resistance materials for various structural applications 36 – 38 .…”

Section: Introductionmentioning

confidence: 99%

Investigating electrochemical corrosion at Mg alloy-steel joint interface using scanning electrochemical cell impedance microscopy (SECCIM)

Prabhakaran,

Strange,

Kalsar

et al. 2023

Sci Rep

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Developing strategies to prevent corrosion at the interface of dissimilar metal alloys is challenging because of the presence of heterogenous distribution of galvanic couples and microstructural features that significantly change the corrosion rate. Devising strategies to mitigate this interfacial corrosion requires quantitative and correlative understanding of its surface electrochemical reaction. In this work, scanning electrochemical cell impedance microscopy (SECCIM) was employed to study location-specific corrosion in the interfacial region of dissimilar alloys, such as AZ31 (magnesium alloy) and DP590 (steel) welded using the Friction-stir Assisted Scribe Technique (FAST) processes. Herein, SECCM and SECCIM were used to perform correlative mapping of the local electrochemical impedance spectroscopic and potentiodynamic polarization to measure the effect of electronic and microstructural changes in the welded interfacial region on corrosion kinetics. Microstructural characterization including scanning electron microscopy and electron backscatter diffraction was performed to correlate changes in microstructural features and chemistry with the corresponding electronic properties that affect corrosion behavior. The variations in corrosion potential, corrosion current density, and electrochemical impedance spectroscopy behavior across the interface provide deeper insights on the interfacial region—which is chemically and microstructurally distinct from both bare AZ31 and DP590 that can help prevent corrosion in dissimilar metal structures.

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“…On the other hand, ion-selective microelectrodes have also been employed as SECM tips in a potentiometric operation [35]. As result, SECM has gained increasing interest and application, especially ove past fifteen years, with significant achievements in the study of pitting initiation and p agation [17,18], galvanic pair formation [19][20][21], the resolution of surface microstruc [22][23][24], stress corrosion [25,26], and the investigation of electron transfer kinetics in sive oxide layers [27,28]. In addition, it is also used to establish the effectiveness of d ent corrosion protection schemes or technologies, including coatings [29][30][31] or su treatments [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Applicability of Voltammetric Modes in Scanning Electrochemical Microscopy for In Situ Corrosion Characterisation of Copper-Based Materials

Hernández-Concepción,

Méndez-Guerra,

Souto

et al. 2023

Metals

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Chemical imaging of corrosion processes involving copper species using scanning electrochemical microscopy has been hampered by the lack of soluble oxidation states for copper that can be achieved by amperometric conversion at the tip. Indeed, the only possibility is to reduce the corrosion products at the tip, thus modifying the chemical response of the electrode material and requiring subsequent redissolution of the copper deposits. Consequently, the limitations arising from the system prevented a full-scale quantification, requiring the development of new methodologies or the optimisation of those currently available, as we pursued with the present work. Therefore, the voltammetric behaviours of gold macro- and microelectrodes were evaluated with respect to the collection and redissolution of Cu2+ ions, with the aim of using them as sensing probes in scanning electrochemical microscopy (SECM) to investigate the activity of copper surfaces in acidic chloride-containing environments. Cyclic and square-wave voltammetric techniques were explored for copper collection and subsequent stripping on Au microelectrode tips in SECM with the objective to capture in situ image electrochemical reactivity distributions across copper surfaces undergoing corrosion.

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High contrast corrosion mapping of dissimilar metal weld joints using alternating current scanning electrochemical microscopy: A case study with Zr-4–Ti–304L SS weld

Cited by 7 publications

References 31 publications

Effect of Redox Mediators on Corrosion Behavior and Scanning Electrochemical Microscopy Response

Effect of Redox Mediators on Corrosion Behavior and Scanning Electrochemical Microscopy Response

Investigating electrochemical corrosion at Mg alloy-steel joint interface using scanning electrochemical cell impedance microscopy (SECCIM)

Evaluation of the Applicability of Voltammetric Modes in Scanning Electrochemical Microscopy for In Situ Corrosion Characterisation of Copper-Based Materials

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