Influence of second phase particles on initial electrochemical properties of AA7010-T76

Wloka, J.; Bürklin, Gotthold; Virtanen, Sannakaisa

doi:10.1016/j.electacta.2007.09.004

Cited by 51 publications

(25 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the preferential dissolution of the matrix was mainly detected at the edge of Al-Cu-Fe-Mnbased intermetallic particles due to the galvanic coupling. The micro-cell technique was also employed for the study of the microelectrochemical behavior of AA7075 aluminum alloy [23][24][25]. The interaction of cathodic intermetallic particles (Al 7 Cu 2 Fe) with the matrix was fully investigated [26].…”

Section: Introductionmentioning

confidence: 99%

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

Paussa

Andreatta

Rosero-Navarro

et al. 2012

Electrochimica Acta

View full text Add to dashboard Cite

t r a c tThis work evaluates the effect of cerium nitrate as corrosion inhibitor for AA2024-T3 in the view of its introduction in sol-gel coatings able to provide self-healing ability. Since it is well established that deposition of Ce species is activated by the local pH increase, the objective of this paper is to investigate the behavior of AA2024-T3 (open circuit potential and polarization curves) in the presence of Ce species in aggressive solutions by means of a local technique, the electrochemical micro-cell. This technique enables the investigation of small areas with resolution in the micrometer range by the use of glass capillaries to define the working electrode area. The micro-cell results clearly displayed that the entire AA2024-T3 area exposed to the ceriumcontaining electrolyte was involved in the cerium precipitation mechanism. The heterogeneous electrochemical behavior of the microstructure is minimized by the formation of a cerium-containing layer able to protect the metal substrate.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

Paussa

Andreatta

Rosero-Navarro

et al. 2012

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…Previous works [3][4][5][6][7] show that Mg 2 Si tends to be anodic with respect to the matrix and can act as initiation sites for corrosion, too. It has been reported that this phase dissolves leaving behind a cavity, which can act as a nucleation site for pitting [7,8]. Moreover, the role played by Mg 2 Si becomes as important when it is present in aluminum-based metal matrix composites as when it is formed in the alloy matrices only, because although it may be dissolved during composite processing (by the liquid state route), it is formed again during the solidification of the alloy as the composite matrix.…”

Section: Introductionmentioning

confidence: 99%

The Role of Mg2Si in the Corrosion Behavior of Al-Si-Mg Alloys for Pressureless Infiltration~!2009-11-21~!2010-06-15~!2010-08-17~!

Escalera-Lozano¹,

Pech‐Canul²,

Montoya-Dávila³

et al. 2010

TOCORRJ

View full text Add to dashboard Cite

Abstract:The role of Mg 2 Si in the electrochemical behavior of Al-Si-Mg aluminum alloys has been studied using four experimental aluminum alloys with variations in the Si/Mg molar ratio (A1-0.12, A2-0.49, A3-0.89, A4-1.05), in neutral aerated 0.1M NaCl solutions. Accordingly, the corrosion potential in open circuit (E oc ) and polarization resistance (Rp) were measured. Results show that the augment in Si/Mg molar ratio increases the presence of Mg 2 Si intermetallic phase. During immersion tests in neutral aerated chloride solutions the anodic activity of the Mg 2 Si intermetallic decreased rapidly, as indicated by a fast ennoblement of open circuit potential. After the immersion period (7 days), higher Rp values for alloys A3 and A4 (21 and 26 K cm 2 , respectively) as compared to those for alloys A1 and A2 (5 and 10 K cm 2 , respectively), suggest a greater corrosion resistance in Cl -containing environments for alloys A3 and A4.

show abstract

“…4,9,[11][12][13] For example, Jain et al 11 found that Mg 2 Si particle can selectively dissolve in neutral solution. Wolka et al…”

mentioning

confidence: 99%

“…4,9,[11][12][13] For example, Jain et al 11 found that Mg 2 Si particle can selectively dissolve in neutral solution. Wolka et al 12 measured the open circuit potential (OCP) of Mg 2 Si using a microcapillary electrochemical cell and stated that the increase of OCP after 1 h immersion in 0.01 M NaCl solution is due to the preferential dissolution of Mg. Mg 2 Si particles in AlMg-Si alloys have also been investigated by SKPFM in combination with atomic force microscopy (AFM) observation, 13 electrochemical micro-cell measurements combined with electron probe micro analysis (EPMA) and auger electron spectroscopy (AES). 4 These techniques reveal that high reactivity of Mg leads to the dealloying of Mg 2 Si particles accompanied with the enrichment of Si, which finally makes the Mg 2 Si remnant exhibit cathodic activity.…”

mentioning

confidence: 99%

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH

Zhang

Tian

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

The galvanic corrosion behavior between pure Al and synthesized bulk Mg 2 Si in 0.01 M NaCl solution at different pH values has been investigated by the scanning vibrating electrode technique (SVET). At pH 2, bulk Mg 2 Si actively dissolves and it acts as an anode. With the increase of exposure time, the anodic activity of Mg 2 Si decreases drastically and eventually anodic activity appears on Al surface. In alkaline solution, Mg 2 Si phase always acts as the cathode. The preferential dissolution of Mg and enrichment of Si found by energy dispersive X-ray spectroscopy are responsible for the observed anodic activity decay of Mg 2 Si in acidic solution. At pH 6, the galvanic corrosion current of Al/Mg 2 Si couple is much less than those at pH 2 and pH 13, and Mg 2 Si mainly undergoes self-dissolution. These results indicate that the dealloying of binary Mg 2 Si phase depends on the solution pH value and corrosion time, which subsequently have a great influence on the galvanic corrosion current of Al/Mg 2 Si couple. Al-Mg-Si alloys are widely used in automotive, aerospace and rail transportation industries because of their high stiffness, good formability, good weldability and high corrosion resistance.1-5 Due to the low solubility of the alloying additions, second phases (such as Mg 2 Si precipitates) are commonly formed in Al-Mg-Si alloys.6 These particles have different electrochemical activities from the alloy matrix, thus galvanic corrosion can occur between the particles and surrounding matrix, 7-10 which gives rise to the degradation of Al alloys in industrial applications.Potentiodynamic polarization tests carried out by Buchheit et al. 7,8 have shown that the corrosion potential of Mg 2 Si is much lower than the alloy matrix. The Volta potential of Mg 2 Si particle measured by scanning kelvin probe force microscopy (SKPFM) is about 100∼180 mV lower than the aluminum matrix. 10 These reports indicate that Mg 2 Si particle is initially anodic relative to the aluminum matrix.Selective dissolution of Mg has been found by many research groups during the corrosion of Mg 2 Si phases. 4,9,[11][12][13] For example, Jain et al. 11 found that Mg 2 Si particle can selectively dissolve in neutral solution. Wolka et al.12 measured the open circuit potential (OCP) of Mg 2 Si using a microcapillary electrochemical cell and stated that the increase of OCP after 1 h immersion in 0.01 M NaCl solution is due to the preferential dissolution of Mg. Mg 2 Si particles in AlMg-Si alloys have also been investigated by SKPFM in combination with atomic force microscopy (AFM) observation, 13 electrochemical micro-cell measurements combined with electron probe micro analysis (EPMA) and auger electron spectroscopy (AES).4 These techniques reveal that high reactivity of Mg leads to the dealloying of Mg 2 Si particles accompanied with the enrichment of Si, which finally makes the Mg 2 Si remnant exhibit cathodic activity. Although SKPFM can measure Volta potential, it cannot provide kinetics parameters relating to the galvanic corrosion ...

show abstract

Influence of second phase particles on initial electrochemical properties of AA7010-T76

Cited by 51 publications

References 7 publications

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

The Role of Mg2Si in the Corrosion Behavior of Al-Si-Mg Alloys for Pressureless Infiltration~!2009-11-21~!2010-06-15~!2010-08-17~!

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH

Contact Info

Product

Resources

About

Influence of second phase particles on initial electrochemical properties of AA7010-T76

Cited by 51 publications

References 7 publications

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

The Role of Mg2Si in the Corrosion Behavior of Al-Si-Mg Alloys for Pressureless Infiltration~!2009-11-21~!2010-06-15~!2010-08-17~!

SVET Study of Galvanic Corrosion of Al/Mg2Si Couple in Aqueous Solutions at Different pH

Contact Info

Product

Resources

About

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH