scholarly journals A novel microelectrochemical strategy for the study of corrosion inhibitors employing the scanning vibrating electrode technique and dual potentiometric/amperometric operation in scanning electrochemical microscopy: Application to the study of the cathodic inhibition by benzotriazole of the galvanic corrosion of copper coupled to iron

2011 ◽  
Vol 58 ◽  
pp. 707-716 ◽  
Author(s):  
Javier Izquierdo ◽  
Lívia Nagy ◽  
Juan J. Santana ◽  
Géza Nagy ◽  
Ricardo M. Souto
Keyword(s):  
Corrosion Inhibitors ◽  
Galvanic Corrosion ◽  
Scanning Electrochemical Microscopy ◽  
Electrode Technique ◽  
Electrochemical Microscopy

Local electrochemical behaviour of friction stir welded Mg-Al-Mn alloy joints

CORROSION ◽  
10.5006/3604 ◽  
2020 ◽  
Author(s):  
SITI HAWA MOHAMED SALLEH ◽  
Geraint Williams ◽  
Sebastian Thomas ◽  
Zhuoran Zeng ◽  
Beth McNally ◽  
...  
Keyword(s):  
Welded Joint ◽  
Electrochemical Behaviour ◽  
Scanning Electrochemical Microscopy ◽  
Electrochemical Characteristics ◽  
Electrochemical Tests ◽  
Friction Stir ◽  
Base Materials ◽  
Galvanic Interaction ◽  
Electrode Technique ◽  
Electrochemical Microscopy

Local scanning electrochemical microscopy (SECM), along with a scanning vibrating electrode technique (SVET), were employed to spatially map anodic and cathodic regions in a complex assembly including a friction stir lap welded joint between two Mg-Al-Mn alloys, namely AM60 and AM30. The assembly investigated herein was comprised of the two base materials (AM60 and AM30) and a stir zone (SZ). The transitory electrochemical characteristics of the three regions were perceived from different electrochemical tests and have been correlated to their respective microstructures. Potentiometric and voltametric SECM performed on the assembly in 0.01 M NaCl revealed that during the first few minutes of exposure, AM60 and SZ regions act as dominant anodic regions in the assembly whilst after 2 hours of exposure these regions transition to become cathodic relative to the AM30 region. Galvanic interaction between the different weld regions immersed in a significantly more conductive NaCl electrolyte was investigated by SVET. Under such conditions, filiform-like corrosion initiated, and propagated exclusively within the AM30 region, resulting in cathodic activation of the corroded surface. However, after approximately 5 hours of exposure, the AM60 region preferentially dissolves following sufficient cathodic activation of the AM30 region.

scholarly journals Development of Mg2+Ion-Selective Microelectrodes for Potentiometric Scanning Electrochemical Microscopy Monitoring of Galvanic Corrosion Processes

2013 ◽  
Vol 160 (9) ◽  
pp. C451-C459 ◽  
Author(s):  
Javier Izquierdo ◽  
András Kiss ◽  
Juan José Santana ◽  
Lívia Nagy ◽  
István Bitter ◽  
...  
Keyword(s):  
Galvanic Corrosion ◽  
Scanning Electrochemical Microscopy ◽  
Electrochemical Microscopy

scholarly journals Use of Amperometric and Potentiometric Probes in Scanning Electrochemical Microscopy for the Spatially-Resolved Monitoring of Severe Localized Corrosion Sites on Aluminum Alloy 2098-T351

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1132 ◽  
Author(s):  
Rejane M. P. da Silva ◽  
Javier Izquierdo ◽  
Mariana X. Milagre ◽  
Abenchara M. Betancor-Abreu ◽  
Isolda Costa ◽  
...  
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Oxygen Depletion ◽  
Localized Corrosion ◽  
Alloy Surface ◽  
Al Alloy ◽  
Spatially Resolved ◽  
Lower Oxygen ◽  
Local Ph ◽  
Electrochemical Microscopy

Amperometric and potentiometric probes were employed for the detection and characterization of reactive sites on the 2098-T351 Al-alloy (AA2098-T351) using scanning electrochemical microscopy (SECM). Firstly, the probe of concept was performed on a model Mg-Al galvanic pair system using SECM in the amperometric and potentiometric operation modes, in order to address the responsiveness of the probes for the characterization of this galvanic pair system. Next, these sensing probes were employed to characterize the 2098-T351 alloy surface immersed in a saline aqueous solution at ambient temperature. The distribution of reactive sites and the local pH changes associated with severe localized corrosion (SLC) on the alloy surface were imaged and subsequently studied. Higher hydrogen evolution, lower oxygen depletion and acidification occurred at the SLC sites developed on the 2098-T351 Al-alloy.

Local electrochemical activity of transition metal dichalcogenides and their heterojunctions on 3D-printed nanocarbon surfaces

Nanoscale ◽  
2021 ◽  
Author(s):  
Katarina A. Novčić ◽  
Christian Iffelsberger ◽  
Siowwoon Ng ◽  
Martin Pumera
Keyword(s):  
Transition Metal ◽  
Electrochemical Performance ◽  
Transition Metal Dichalcogenides ◽  
Scanning Electrochemical Microscopy ◽  
Electrochemical Activity ◽  
Thermally Activated ◽  
Metal Dichalcogenides ◽  
3D Printed ◽  
Electrochemical Microscopy

MoS2 and WS2 and their heterojunctions are used to modify thermally activated 3D-printed nanocarbon structures. Herein, the local electrochemical performance for HER of the modified structures is demonstrated by scanning electrochemical microscopy.

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