Visualisation of the Galvanic Effects at Welds on Carbon Steel

Pagotto, Josias Falararo; Montemor, M.F.; Recio, Francisco J.; Motheo, Artur J.; Simões, A.M.; Herrasti, P.

doi:10.5935/0103-5053.20150024

Cited by 4 publications

(3 citation statements)

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“…The obtained results agree with behavior presented by others authors (Bastos, 2006) (Falcón, 2014) (Pagotto, 2015). The AISI 1020 steel corrosion process is commonly reported by authors that study anti-corrosion coatings or weld heat treatment.…”

Section: Resultssupporting

confidence: 91%

SVET characterization of corrosion process in carbon steel 1020

Vichessi¹,

Calegari²,

Marino³

et al. 2016

Blucher Chemistry Proceedings

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The study of corrosion process on metal surfaces has been widely conducted for several years, from classical nondestructive electrochemical techniques, such as Open Circuit Potential (OCP) and Electrochemical Impedance Spectroscopy (EIS). However, these techniques allow only the analysis of the global response of the electrochemical system, whereas the regions where localized corrosion occurs (pitting, crevice, passive film rupture, etc.) are left without identification.One of the localized electrochemical techniques, the latter of these systems, named SVET (Electrochemical Technique Vibrating Electrode), allows an improved resolution and lower minimum detectable signal in the evaluation of the corrosion phenomena. This technique stands out because it allows mapping the exact location at separated sites in the metal/electrolyte interface where the anodic and cathodic processes take place enabling the distinction of the contribution of each event.In this study, SVET technique was used to investigate the corrosion process of carbon steel in media containing chloride. Carbon steels are ferrous alloys made of iron and carbon, widely used in engineering and industry. The SVET results showed the evolution of corrosion process in function of time on steel sample. This recent electrochemical technique allowed the analysis and differentiation of intensity of oxidation reaction in different regions of the sample.

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Section: Resultssupporting

confidence: 91%

SVET characterization of corrosion process in carbon steel 1020

Vichessi¹,

Calegari²,

Marino³

et al. 2016

Blucher Chemistry Proceedings

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“…The corrosion problem of welded joints has been widely studied worldwide. Pagotto (2015) studied the corrosion behaviour of welded joints of 20 steel whose carbon content is 0.2% in NaCl solution through the traditional electrochemical test method and found that both the base metal (BM) and the weld metal (WM) had the characteristics of single capacitance arc. As the corrosion products generated were loose and porous, their protection to the substrate was limited, and the charge transfer resistance of the BM increased first and then decreased with time.…”

Section: Introductionmentioning

confidence: 99%

Investigation on corrosion tendency behaviour of TA2 titanium alloy welded joints under flow scouring conditions using the array electrode method

Liu,

Zhang

et al. 2023

ACMM

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Purpose The corrosion behaviour of titanium alloy surface when fluid with different flow rates flows through welded joints with different residual heights was explored. Design/methodology/approach The experiment uses a combination of array electrodes and simulation. Findings It is found that when the weld reinforcement exists, the corrosion tendency of both ends of the weld metal is greater than that of other parts of the welded joint due to the influence of high turbulence kinetic energy and shear stress. The presence of weld reinforcement heights makes the fluid behind it fluctuate greatly. The passivation films of both the base metal (BM) at the rear and the heat-affected zone (HAZ) are more prone to corrosion than those of the front BM and HAZ, and the passivation film is rougher. Originality/value The combination of test and simulation was used to explore the influence of electrochemical and hydrodynamic factors on the corrosion behaviour of titanium alloy-welded joints when welding residual height existed.

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“…This welding consumable does not guarantee the WM will have high resistance to corrosion or corrosion-induced HAC. In this regard, Pagotto et al [ 17 ] reported a much higher anodic dissolution current at welds relative to the BM of carbon steel in a neutral aqueous environment, employing a scanning vibrating electrode technique (SVET).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-Induced Cracking Caused by Galvanic Corrosion of Steel Weld in a Sour Environment

2021

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This study examined the hydrogen-induced cracking (HIC) caused by galvanic corrosion of an ASTM A516-65 steel weld in a wet sour environment using a combination of standard immersion corrosion test, electrochemical analyses, and morphological observation of corrosion damage. This study showed that the weld metal has lower open circuit potential, and higher anodic and cathodic reaction rates than the base metal. The preferential dissolution and much higher density of localized corrosion damage were observed in the weld metal of the welded steel. On the other hand, the presence of weldment can make steel more susceptible to HIC, specifically, in areas of the base metal but not in the weld metal or heat affected zone, which is in contrast to typical expectations based on metallurgical knowledge. This can be explained by galvanic corrosion interactions between the weldment and the base metal, acting as a small anode and a large cathode, respectively. This type of galvanic couple can provide large surface areas for infusing cathodically-reduced hydrogen on the base metal in wet sour environments, increasing the susceptibility of welded steel to HIC.

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Visualisation of the Galvanic Effects at Welds on Carbon Steel

Cited by 4 publications

References 0 publications

SVET characterization of corrosion process in carbon steel 1020

SVET characterization of corrosion process in carbon steel 1020

Investigation on corrosion tendency behaviour of TA2 titanium alloy welded joints under flow scouring conditions using the array electrode method

Hydrogen-Induced Cracking Caused by Galvanic Corrosion of Steel Weld in a Sour Environment

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