Pitting corrosion of welded joints of austenitic stainless steels studied by using an electrochemical minicell

Garcı́a, C.; Martín-Pedrosa, Fernando; Tiedra, Pilar De; Blanco, Y.; López, M.

doi:10.1016/j.corsci.2007.11.028

Cited by 123 publications

(53 citation statements)

References 27 publications

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“…However, in the case of the pre-SMATed sample, the HAZ region shows only some shallow grooves along grain boundaries, as depicted in Figure 7c,d. Based on the above results, it can be concluded that the HAZ of the SMATed sample does not show any clear sensitization, unlike what was previously reported for un-SMATed stainless steels [21,24]. This fact suggests that the high densities of twins formed in the pre-SMATed sample are not susceptible to intergranular corrosion because of their regular and coherent atomic structure and extreme low grain boundary energy as compared with those of other grain boundaries [7].…”

Section: Methodscontrasting

confidence: 50%

Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment

2012

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Surface mechanical attrition treatment (SMAT) was applied to the samples of a type AISI 304 stainless steel in order to induce grain refinement as well as formation of twins. Transmission electron microscopy and X-ray diffraction analysis results showed that the average grain size at the surface of the SMATed sample was about 10 nm. The untreated and SMATed samples were then welded using a one-pass gas tungsten arc procedure. The heat-affected zone (HAZ) of the samples was examined by optical microscopy and corrosion tests. Results of the double loop electrochemical potentiokinetic reactivation tests showed that the degree of sensitization in the HAZ for the SMATed sample was very low as compared to that of the untreated one. The pre-SMATed sample was resistant to intergranular corrosion. This is mainly due to the formation of high density of twins which are not prone to carbide precipitation because of their regular and coherent atomic structure and extreme low grain boundary energy as compared with those of other grain boundaries.

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Section: Methodscontrasting

confidence: 50%

Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment

2012

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“…This could be a sign of a good pitting corrosion resistance for these samples. The higher content of δ-ferrite in the HAZ could explain the less noble pitting potentials; δ-ferrite can be detrimental because of its susceptibility to attack in chloride medium [15]. Comparing, root and top samples, is possible to note that for SMAW and FCAW welding process, top samples show higher breakdown potential than root samples.…”

Section: Resultsmentioning

confidence: 82%

Use of the Electrochemical Microcell Technique for Studying Pitting Corrosion at Welded Joints of Lean Duplex Stainless Steel Uns S32304

Sicupira¹,

Júnior²,

Bracarense³

et al. 2019

ABM Proceedings

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A pitting corrosion study of welded joints of lean duplex stainless steel (LDSS) UNS S32304 has been performed. LDSS S32304 thick plates were welded by different processes commonly employed in equipment and piping construction: SMAW (Shielded metal arc welding), GMAW (Gas metal arc welding) and FCAW (Flux cored arc welding). The electrochemical behavior of different weldment zones (fusion zone (FZ), base metal (BM) and heat affected zone (HAZ)) was characterized both independently using an electrochemical microcell and together through whole sample analysis. The electrochemical method applied was performed in acidified glycerin, a process fluid of the biodiesel industry. The results were correlated to the microstructural features of the materials. Based on the results, is possible to conclude that the breakdown potential (E b ) of the fusion zone (FZ) was higher than the E b obtained for the heat affected zone (HAZ). In general, top samples show higher breakdown potential than root samples and also the samples welded using filler metal 2209 has a better anodic behavior than the filler metal 2307. According to the results, GMAW welding process with 2209 as filler metal was revealed as the optimum chosen for application of 2304 duplex stainless steels in this case.

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“…Higher magnifications in the observation of corrosion processes is a very important point because despite the fact that the effects of corrosion processes are visible at large scale, its mechanisms happen at a smaller scale. Some authors have used microscopic systems such as microcells, scanning electrochemical microscopy or atomic force microscopy in order to study in-situ corrosion processes (García et al, 2008a;García et al, 2008b;Martin et al, 2008). These experimental devices can be applied to different settings, such as heterogeneous materials (dual phase steels, welding, etc).…”

Section: Previous Corrosion Studies With Image Acquisition Systemsmentioning

confidence: 99%

Application of Confocal Laser Scanning Microscopy to the In-situ and Ex-situ Study of Corrosion Processes

Leiva-García¹,

Garcı́a-Antón²,

Muñoz-Portero³

2011

Laser Scanning, Theory and Applications

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Pitting corrosion of welded joints of austenitic stainless steels studied by using an electrochemical minicell

Cited by 123 publications

References 27 publications

Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment

Prevention of weld-decay in austenitic stainless steel by using surface mechanical attrition treatment

Use of the Electrochemical Microcell Technique for Studying Pitting Corrosion at Welded Joints of Lean Duplex Stainless Steel Uns S32304

Application of Confocal Laser Scanning Microscopy to the In-situ and Ex-situ Study of Corrosion Processes

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