Scanning Reference Electrode Technique for the Investigation of Preferential Corrosion of Weldments in Offshore Applications

Voruganti, V. S.; Luft, H.B.; DeGeer, Duane; Bradford, S. A.

doi:10.5006/1.3585264

Cited by 41 publications

(12 citation statements)

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“…Voruganti devised parameters, RI and ChE index, to approach quantitative assessment between minute compositional differences and microstructures of the base and weld metal on weldment corrosion by the scanning reference electrode techniques [13]. RI is an index which represents corrosion susceptibility caused by the relative differences of each microstructure, represented as microhardness at each zone.…”

Section: Relationships Between the Composition And Microstructurementioning

confidence: 99%

Flow‐accelerated corrosion behavior of SA106 Gr. C weldment

Kim

Kim²,

Zheng

2003

Materials & Corrosion

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Chemical and geometrical effects of weld on flow-accelerated corrosion (FAC) of SA106 Gr.C low alloy steel pipe was investigated using rotating cylinder electrode in 3.5-wt% sodium chloride solution and simulated feedwater of nuclear power plants. Polarization tests and weight loss tests were conducted at rotating speed of 2000 rpm (3.14 m/s) with variation of chemical and geometric parameters. The results showed that the chemical effects were relatively larger than the geometrical effects, and the welded parts became local anode and preferentially corroded, which was explained by the differences between microstructural and compositional parameters. On the other hand, under active corrosion conditions, the heat affected zone was severely corroded and microstructural effects were dominant.

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Section: Relationships Between the Composition And Microstructurementioning

confidence: 99%

Flow‐accelerated corrosion behavior of SA106 Gr. C weldment

Kim

Kim²,

Zheng

2003

Materials & Corrosion

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“…*ISO 15614-1:2017, a specification which qualifies welding procedures for metallic materials states that the Equation 1 is not suitable when power source with complex waveforms are used such as CMT. Therefore, HI value for CMT showed in Table 2 does not represent the real heat, but for simplicity equation 1 was used 17 .…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…The scanning vibrating electrode technique (SVET) provides a means of measuring the magnitude and sign of current density distributions over freely corroding metal surfaces immersed in corrosive solution. SVET has been used to pinpoint regions of the weld which are most susceptible to breakdown and how subsequent cathodic activation of previously corroded areas influences the propagation of localised corrosion features [12][13][14][15][16][17].…”

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confidence: 99%

Global and Local Corrosion of Welded Joints of High-Strength Low-Alloy Automotive Steel

et al. 2021

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Global and local corrosion techniques were used to study the corrosion behaviour of weld joints of a high strength low alloy steel (LNE500), typically employed in the automotive industry, in Brazil. The welded joints were prepared by gas metal arc welding (GMAW). Two welding transfer modes were used in order to obtain different heat inputs (HI): pulsed (PUL) and cold metal transfer (CMT). Local and global corrosion analysis techniques presented complementary information. While the local in-situ analysis (scanning vibrating electrode technique) revealed the weld metal (WM) as the region where corrosion started, conventional electrochemical techniques (Potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS)) revealed a higher corrosion rate in the coarse-grained heat affected zone (CGHAZ), which was preferentially corroded. A superior corrosion resistance of the weld metal obtained using CMT over the PUL transfer mode was revealed by EIS and PP. In addition, the results from CMT and PUL samples show that austenite grain size affects the propagation of the corrosion process. The results are discussed based on microstructural and compositional aspects of the different regions that characterize the welded joints.

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“…Since this passive probe has no selectivity for ionic species, this is evidently a measure of the electrical field. This principle is exploited in the scanning reference electrode technique (SRET), 28,29 and the scanning vibrating electrode technique (SVET). 30 This experiment confirmed the hypothesis that if the reference electrode is at approximately the same location as the ISME for each measurement point during the scan, the potential sensed by the reference electrode follows the change in the electrical field experienced by the ISME, and its effect can be neglected.…”

Section: C275mentioning

confidence: 99%

Double Barrel Microelectrode Assembly to Prevent Electrical Field Effects in Potentiometric SECM Imaging of Galvanic Corrosion Processes

Filotás

Fernández-Pérez

Nagy

et al. 2018

J. Electrochem. Soc.

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There is great interest in elucidating the corrosion mechanism of magnesium, and different experimental methods and techniques are explored with this purpose. Among the scanning probe techniques, scanning electrochemical microscopy (SECM) is delivering some promising results in recent years. In particular, the use of ion selective microelectrodes (ISME) as SECM sensing probes allow monitoring of the temporal and spatial distribution of different ionic species related to the corrosion reactions. However, a serious disturbance in the measured potential can be observed when it comes to galvanic coupling or polarization of the samples. This work explores the factors that affect the magnitude of the electrical field effects associated with the galvanic coupling, and describes an experimental arrangement for potentiometric SECM able to avoid the unwanted contribution of the potential field. The performance of a double barrel electrode assembly comprising an ion selective microelectrode and an internal reference electrode was compared to that of a conventional single barrel ISME in order to establish its applicability for the investigation of corrosion systems presenting electrical field distributions.

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Scanning Reference Electrode Technique for the Investigation of Preferential Corrosion of Weldments in Offshore Applications

Cited by 41 publications

References 0 publications

Flow‐accelerated corrosion behavior of SA106 Gr. C weldment

Flow‐accelerated corrosion behavior of SA106 Gr. C weldment

Global and Local Corrosion of Welded Joints of High-Strength Low-Alloy Automotive Steel

Double Barrel Microelectrode Assembly to Prevent Electrical Field Effects in Potentiometric SECM Imaging of Galvanic Corrosion Processes

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