Comparison of corrosion behavior of Al‐Mn and Al‐Mg alloys in chloride aqueous solution

Wang, B.; Liu, J.; Yin, Ming; Xiao, Yanping; Wang, X. H.; He, Jian

doi:10.1002/maco.201408211

Cited by 37 publications

(12 citation statements)

References 44 publications

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“…The E CORR for Al‐5.5Mn was unstable over the first 3 h of exposure to 0.138 M MgCl 2 and throughout the 12 h exposure to 0.275 M NaCl. The potential transients suggest local metastable breakdown events, possibly associated with Mn‐depleted Al‐enriched regions of the alloy , which was observed recently on Al‐Mn alloys . Similar metastable events were not observed in E CORR measurements on Al‐13.5Mn.…”

Section: Discussionsupporting

confidence: 85%

The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

Asmussen

Binns

Partovi‐Nia

et al. 2015

Materials & Corrosion

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The electrochemical behaviour of two Al‐Mn materials (Al‐ 5.5 at % Mn and Al‐ 13.5 at % Mn) has been studied in 0.275 M NaCl and 0.138 M MgCl2 solutions to simulate the cathodic environment of Al‐Mn particles during the corrosion of a Mg alloy. Upon polarization in NaCl solution to a potential in the range expected on a corroding Mg alloy, the Al‐5.5 at % Mn alloy proved unstable undergoing de‐alloying (loss of Al) and delamination of layers of the Al(OH)3 formed. This leads to a steady increase H2O reduction current. When polarized in MgCl2 solution the surface was partially protected from de‐alloying and the current for H2O reduction suppressed by the deposition of Mg(OH)2. The Al‐13.5 at % Mn alloy was considerably more stable when cathodically polarized. This increased stability was attributed to the higher density of Mn‐enriched areas in the alloy surface. This simulation of the microgalvanic cathodic behaviour of Al‐Mn intermetallic particles confirms that the appearance of corrosion product domes on the Al‐Mn intermetallic particles during the corrosion of Mg alloys as an indication of their cathodic behaviour and that Al‐Mn intermetallic particles are efficient, yet unstable cathodes.

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Section: Discussionsupporting

confidence: 85%

The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

Asmussen

Binns

Partovi‐Nia

et al. 2015

Materials & Corrosion

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“…As discussed above, E ptp is independent with ex‐situ applied load, E rev , and scan circle. Previous literature also reported that E ptp is independent with surface orientation, i rev , pH, and immersion time . These factors can hugely affect the corrosion degree and surface morphology of alloys.…”

Section: Discussionmentioning

confidence: 88%

“…These factors can hugely affect the corrosion degree and surface morphology of alloys. Also, factors like pH, ex‐situ applied load, and immersion time could significantly influence pitting potential E pit . The value of E pit showed negative trend with pH and applied load.…”

Section: Discussionmentioning

confidence: 99%

Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp

Sun

Chen

2018

Materials & Corrosion

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The influences of ex‐situ applied load, scan circle, reverse potential, chloride concentration, and temperature on inflection (Eptp) of backward sweep of cyclic polarization of 7150 Al alloy were investigated. The 2nd derivative of polarization curves was used to accurately determine the value of Eptp. Eptp is determined as the potential where massive metastable pits finished their repassivation process during reverse scan, providing an insight into highly constricted forms of localized corrosion repassivation. Chloride ion and diffusion condition have predominant effects on this inflection. Eptp showed non‐monotonic trend with temperature and relevant discussion was given as well.

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“…Aluminium-magnesium (Al-Mg) alloys are attractive for their high strength, high ductility, high formability, high corrosion resistnace and weldablity [1,2]. Various methods are applied to increase the strength and other properties by modifying the structures of Al-Mg alloys [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of rolling on the fractional recrystallization behaviour of Al-Mg and Al-Mg-Zr alloys

Kaiser¹,

Shorowordi²,

Rashed³

2019

J. mech. eng.

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One set of Al–Mg and Al-Mg-Zr alloys are directly cold rolled and other set of those alloys are hot rolled and then cold rolled using a laboratory rolling mill. The effect of rolling on the fractional recrystallization of the alloys has been investigated using the micro-hardness variation. Isothermally annealed samples are also studied using JMAK type analysis to see if there exists any correlation between experimental and JMAK type analysis. From the microstructure, it is observed that the Al-Mg alloy becomes almost fully recrystallized state after annealing at 600°K for 60 minutes. The results also show that recrystallization fraction obtained by the two methods, shows the higher variation in zirconium added Al-Mg alloy as compared to the Al-Mg alloy. The fractional recrystallization of the cold rolled Al-Mg-Zr alloy is significantly lower than that of cold rolled Al-Mg alloy and hot and colled rolled Al-Mg-Zr, owing to the presence of fine Al3Zr precipitates. These metastable L12 Al3Zr precipitates are thermally stable at high annealing temperatures.

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Comparison of corrosion behavior of Al‐Mn and Al‐Mg alloys in chloride aqueous solution

Cited by 37 publications

References 44 publications

The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp

Effect of rolling on the fractional recrystallization behaviour of Al-Mg and Al-Mg-Zr alloys

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Comparison of corrosion behavior of Al‐Mn and Al‐Mg alloys in chloride aqueous solution

Cited by 37 publications

References 44 publications

The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

The stability of aluminum‐manganese intermetallic phases under the microgalvanic coupling conditions anticipated in magnesium alloys

Inflection of backward sweep of cyclic polarization curve: Pit transition potential Eptp

Effect of rolling on the fractional recrystallization behaviour of Al-Mg and Al-Mg-Zr alloys

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Product

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Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp