Effect of low copper content and heat treatment on intergranular corrosion of model AlMgSi alloys

Svenningsen, Gaute; Lein, John Erik; Bjørgum, Astrid; Nordlien, Jan Halvor; Yu, Yingda; Nisancioḡl̄ū, Kemal

doi:10.1016/j.corsci.2004.11.025

Cited by 139 publications

(126 citation statements)

References 15 publications

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“…In addition, a thin Cu film forms along the grain boundaries and plays the key role in IGC growth and propagation. [3][4][5][6] The entire precipitation process is thermally activated and depends on the diffusion of alloying elements. Its rate is described by an Arrhenius equation.…”

Section: Discussionmentioning

confidence: 99%

“…Their improved machinability is imparted by alloying with Pb (6012 alloy) or with Bi+Pb (6262 and 6064 alloys). These alloys have higher alloy levels and contain more phases than the alloys studied in [3][4][5][6][7][8][9][10][11] . These phases include Bi and Pb cathodic particles.…”

Section: Introductionmentioning

confidence: 99%

“…The occurrence of IGC was monitored in 2.5 mm × 78 mm extruded flat bars. The effects of the cooling rate from the extrusion temperature were studied 3 , as were the effects of artificial ageing. 4,5 Corrosion tests were carried out according to EN ISO 11846, method B.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6] The alloys contained 0.5-0.6 % Mg, 0.6-0.8 % Si, 0.2 % Fe, 0.2 % Mn and Cu at 0.02 through 0.7 % of mass fractions. The occurrence of IGC was monitored in 2.5 mm × 78 mm extruded flat bars.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of Cu as well as the opportunities for enhancing the resistance to intergranular corrosion have received considerable attention in a number of studies. [3][4][5][6][7][8][9][10][11] Intergranular corrosion (IGC) is typically related to the formation of microgalvanic cells between the cathodic more-noble phases and the depleted (precipitate-free) zones along the grain boundaries. It is encountered mainly in AlMgSi alloys that contain Cu, where it is thought to be linked to the formation of cathodic Q-phase (Al 4 Mg 8 Si 7 Cu 2 ) along the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thermomechanical treatment on the intergranular corrosion of Al-Mg-Si-Type alloy bars

Sláma¹,

Nacházel²

2016

Mater. Tehnol.

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Al-Mg-Si-type alloys (6xxx-series alloys) exhibit good mechanical properties, formability, weldability and good corrosion resistance in a variety of environments. They often find use in the automotive industry and other applications. Some alloys, however, particularly those with higher copper levels, show increased susceptibility to intergranular corrosion. Intergranular corrosion (IGC) is typically related to the formation of microgalvanic cells between cathodic, more-noble phases and depleted (precipitate-free) zones along the grain boundaries. It is encountered mainly in Al-Mg-Si alloys containing Cu, where it is thought to be related to the formation Q-phase precipitates (Al4Mg8Si7Cu2) along the grain boundaries. The present paper describes the effects of mechanical working (pressing, drawing and straightening) and artificial ageing on intergranular corrosion in a bar of the 6064 alloy. The resistance to intergranular corrosion was mapped using corrosion tests according to EN ISO 11846, method B. The corrosion tests showed that with continuing ageing and over-ageing, deep IGC changes into pitting corrosion with a smaller depth of attack. However, the corrosion resistance of the bars is impaired by post-quench mechanical working (drawing and straightening). Keywords: Al-Mg-Si-Cu alloy, 6064 alloy, extruded bars, thermomechanical treatment, intergranular corrosion, pitting corrosion Zlitine vrste Al-Mg-Si (6xxx-vrsta zlitin) ka`ejo dobre mehanske lastnosti: preoblikovalnost, varivost in dobro korozijsko odpornost v razli~nih okoljih. Pogosto se uporabljajo v avtomobilski industriji in tudi v druge namene. Vendar pa nekatere zlitine, posebno tiste z vi{jo vsebnostjo bakra, ka`ejo pove~ano ob~utljivost na interkristalno korozijo. Interkristalna korozija (IGC) je zna~ilno povezana z nastankom mikrogalvanskih celic med katodno, bolj plemenito fazo in osiroma{enim (brez izlo~kov) podro~jem, vzdol`meja kristalnih zrn. To se pojavlja predvsem v AlMgSi zlitinah, ki vsebujejo Cu in kjer se predpostavlja, da je to povezano z nastankom izlo~kov Q-faze (Al4Mg8Si7Cu2), vzdol`meja med zrni.^lanek opisuje vpliv mehanskega preoblikovanja (stiskanje, vle~enje, ravnanje) in vpliv umetnega staranja na interkristalno korozijo palic iz zlitine 6064. Odpornost na interkristalno korozijo je bila preslikana s pomo~jo korozijskih preizkusov, skladno s standardom EN ISO 11846, metoda B. Korozijski preizkusi so pokazali da se z nadaljevanjem staranja in prestaranjem globoke interkristalne korozije, spremenijo v jami~asto korozijo, z manj{o globino napada. Vseeno pa je korozijska odpornost palic poslab{ana z mehansko predelavo (vle~enje in ravnanje) po ga{enju.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of thermomechanical treatment on the intergranular corrosion of Al-Mg-Si-Type alloy bars

Sláma¹,

Nacházel²

2016

Mater. Tehnol.

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Localized Corrosion

Shifler

2022

LaQue's Handbook of Marine Corrosion

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The influence of copper content on intergranular corrosion of model AlMgSi(Cu) alloys

Zhan

Mol

Hannour

et al. 2008

Materials & Corrosion

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Application prospects in automotive and aerospace industry have led to extensive studies on AA6xxx alloys in recent years. Varying amounts of Mg, Si and Cu and heat treatments are used to achieve the desired mechanical properties in these alloys. In this investigation, a series of tests have been designed and carried out on model AlMgSi(Cu) alloys to investigate the effects of Cu, Mg and Si composition and heat treatments on the corrosion properties for a range of Cu content levels (0.03, 0.15 and 0.80 wt%, respectively).The results indicate that the localized corrosion susceptibility of the model alloys primarily increased with Cu content. The Si and Mg content and ratio do not appear to have a significant effect on the local corrosion behaviour. Heat treatment can improve the corrosion resistance. However, this effect is small compared to that of the Cu content for the range of model alloys investigated. Intergranular corrosion will occur by micro-galvanic coupling between the cathodic AlMgSi(Cu) (Q) phase precipitates and the aluminum matrix adjacent to the particles. The increasing susceptibility to intergranular corrosion with Cu content can be attributed to an increased formation of Q phase particles.

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Effect of low copper content and heat treatment on intergranular corrosion of model AlMgSi alloys

Cited by 139 publications

References 15 publications

Effect of thermomechanical treatment on the intergranular corrosion of Al-Mg-Si-Type alloy bars

Effect of thermomechanical treatment on the intergranular corrosion of Al-Mg-Si-Type alloy bars

Localized Corrosion

The influence of copper content on intergranular corrosion of model AlMgSi(Cu) alloys

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