Correlating the Modes of Corrosion with Microstructure in the Friction Stir Welded AA2198-T8 Alloy in Aqueous Hydrogen Peroxide-Chloride Medium

Machado, Caruline de Souza Carvalho; Donatus, Uyime; Milagre, Mariana Xavier; Mogili, Vishnu; Klumpp, Rafael Emil; Araujo, João Victor de Sousa; Ferreira, Raphael Oliveira; Costa, Isolda

doi:10.5006/3054

Cited by 17 publications

(12 citation statements)

References 37 publications

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“…23 In the present F I G U R E 1 5 XPS high resolution spectra: (A) Si2p for polished AA 2198 T8 coated with BTSE and (B) for unpolished AA2198 T8 coated with BTSE, (C) Mg1s for unpolished AA2198 T8 coated with BTSE, and (D) Li1s for unpolished AA2198 T8 coated with BTSE study, it is suggested that the poor corrosion protection ability of the unpolished samples coated with BTSE is caused by the heterogeneous surface related to the highly active surface corresponding to Mg-enriched bands regions of the unpolished samples, Figure 3, leading to preferential sites for localized corrosion. 22,23,37,58 The XPS signal for the unpolished sample showed more intense peaks for Mg and Li as expected, and it resulted in a surface electrochemically more active than the polished one, as showed in the SECM maps, Figure 12C,D.…”

Section: Discussionsupporting

confidence: 64%

Corrosion protection of the AA2198‐T8 alloy by environmentally friendly organic‐inorganic sol‐gel coating based on bis‐1,2‐(triethoxysilyl) ethane

Klumpp

Donatus

Silva

et al. 2020

Surface & Interface Analysis

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In this work, a surface coating composed of organic‐inorganic hybrid sol‐gel based on bis‐1,2‐(triethoxysilyl) (BTSE) ethane was applied on AA2198‐T8 samples, and its effect on corrosion resistance was investigated and compared with that of a chromate layer formed in a solution with hexavalent chromium ions. The corrosion resistance of BTSE coated samples was evaluated by immersion tests in sodium chloride solution (0.005 mol/L NaCl) and monitored by global electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and local electrochemical techniques such as scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM). The formed coating layers were characterized by X‐ray photoelectron spectroscopy (XPS). The results pointed out that the BTSE is an effective alternative coating for corrosion protection of new generation Al‐Cu‐Li alloys and could replace chromates obtained in toxic and carcinogenic CrVI containing solutions leading to improved corrosion protection.

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Section: Discussionsupporting

confidence: 64%

Corrosion protection of the AA2198‐T8 alloy by environmentally friendly organic‐inorganic sol‐gel coating based on bis‐1,2‐(triethoxysilyl) ethane

Klumpp

Donatus

Silva

et al. 2020

Surface & Interface Analysis

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“…High corrosion activities for various Al-Cu-Li alloys welded by FSW have been reported [5][6][7][8][24][25][26][27]. Among them, recent investigations by our group on the related AA2198 Al-Cu-Li alloy have shown that the parent material (PM) region is the most susceptible to localized corrosion in Al-Cu-Li alloys welded by FSW, a feature due to the highest amount of the T1 phase occurring in this region [6,7,27].…”

Section: Introductionmentioning

confidence: 99%

On the local corrosion behavior of coupled welded zones of the 2098-T351 Al-Cu-Li alloy produced by Friction Stir Welding (FSW): An amperometric and potentiometric microelectrochemical investigation

Silva

Izquierdo

Milagre

et al. 2021

Electrochimica Acta

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The galvanic coupling effects and the local electrochemical activity developed along the welded zones in FSWelded 2098-T351 Al-Cu-Li alloy have been investigated using localized electrochemical methods supported by surface analytical characterizations. The investigation was carried out in the coupled welding joint/heat affected zones (WJ/HAZ) for both the retreating (RS) and the advancing (AS) sides. The correlation between surface chemistry, microstructural features and electrochemical activity of these welded zones has been studied. The results showed the development of galvanic interactions within and between the WJ and the HAZ regions that were visualized using the Scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM). SVET analyses showed that the HAZ was more susceptible to the development of anodic sites compared to WJ. SECM in amperometric operation mode showed that the WJ coupled to HAZ presented higher oxygen consumption and greater cathodic activity compared to HAZ. Furthermore, SECM in the potentiometric operation mode showed alkalization on the WJ and increased acidity on the HAZ, mainly at severe localized corrosion (SLC) sites. Based on SVET and SECM results in combination surface analysis, it is proposed that the micro-galvanic cells formed within these welded zones are due to the presence of secondary phases in the 2098-T351 alloy and their interactions with the adjacent matrix.

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“…[16][17][18][19] Consequently, many research studies have been developed to understand the influence of Al alloys' microstructural features in the propagation of these kinds of corrosion morphologies. [20][21][22][23][24][25][26] The effects of the fabrication process [27][28][29][30][31] and heat treatment [32][33][34][35][36][37][38][39][40][41] on the microstructural features, and thus on the corrosion behavior are commonly investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Machado et al [ 27 ] and Milagre et al [ 20 ] studied the IGC and exfoliation development in two different types of Al–Cu–Li alloys welded by friction stir welding (FSW). It was verified that susceptibility to these forms of corrosion changed according to the microstructural features of each FSW zone, such as grain size and dissolution of strengthening phases.…”

Section: Introductionmentioning

confidence: 99%

Exfoliation and intergranular corrosion resistance of the 2198 Al–Cu–Li alloy with different thermomechanical treatments

Araujo

Milagre

Ferreira

et al. 2020

Materials & Corrosion

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In this study, the resistance to exfoliation and intergranular corrosion (IGC) of the 2198 Al-Cu-Li alloy submitted to different thermomechanical treatments (T3, T8, and T851) was investigated. The tests were carried out following the standard practices, ASTM G34-18 and ASTM G110-15, respectively. All the tested alloys showed susceptibility to exfoliation and some alloys showed susceptibility to IGC, but the artificially aged alloys presented a higher tendency to exfoliation. The extensive hydrogen evolution reaction (HER) was observed on the surfaces of artificially aged alloys when immersed in the EXCO solution. The HER resulted in an increase in solution pH with the time of immersion. Also, the weight losses related to the artificially aged alloys were higher than that of the naturally aged ones. The T8 treatment was the only condition that resulted in susceptibility to both, intergranular and transgranular corrosion, whereas the T851 treatment did not show IGC susceptibility, only transgranular corrosion. Finally, the 2198-T3 condition showed the highest corrosion resistance among the thermomechanical treatments tested. The results of the 2198 alloy subjected to various treatments were compared with that of the 2024-T3 alloy. This last alloy showed higher resistance to exfoliation and IGC as compared with the 2198 alloy.

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Correlating the Modes of Corrosion with Microstructure in the Friction Stir Welded AA2198-T8 Alloy in Aqueous Hydrogen Peroxide-Chloride Medium

Cited by 17 publications

References 37 publications

Corrosion protection of the AA2198‐T8 alloy by environmentally friendly organic‐inorganic sol‐gel coating based on bis‐1,2‐(triethoxysilyl) ethane

Corrosion protection of the AA2198‐T8 alloy by environmentally friendly organic‐inorganic sol‐gel coating based on bis‐1,2‐(triethoxysilyl) ethane

On the local corrosion behavior of coupled welded zones of the 2098-T351 Al-Cu-Li alloy produced by Friction Stir Welding (FSW): An amperometric and potentiometric microelectrochemical investigation

Exfoliation and intergranular corrosion resistance of the 2198 Al–Cu–Li alloy with different thermomechanical treatments

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