Effect of Electrical Parameters on the Microstructure and Corrosion Resistance of Anodized Film of Mg-1Zn-1Gd Alloy Based on Orthogonal Experiment Method

Lin, Erli; Li, Xiaopei; Kure‐Chu, Song‐Zhu; Li, Xiaohui; Xiao, Xiufeng

doi:10.1007/s11665-023-08288-4

Cited by 2 publications

(2 citation statements)

References 41 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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“…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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Effect of Electrical Parameters on the Microstructure and Corrosion Resistance of Anodized Film of Mg-1Zn-1Gd Alloy Based on Orthogonal Experiment Method

Cited by 2 publications

References 41 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

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

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