Volta potential of second phase particles in extruded AZ80 magnesium alloy

F. Andreatta; I. Apachitei; A. Kodentsov; J. Dzwonczyk; J. Duszcyk

doi:10.1016/j.electacta.2005.10.010

Volta potential of second phase particles in extruded AZ80 magnesium alloy

F. Andreatta, I. Apachitei, A. Kodentsov, J. Dzwonczyk, J. Duszcyk

Materials and Interface Chemistry

Research output: Contribution to journal › Article › Academic › peer-review

122 Citations (Scopus)

Abstract

Magnesium alloys show strong susceptibility to localized corrosion when immersed in aggressive solutions (e.g. chlorides). The existence of second phase particles in the microstructure might represent initiation sites for localized corrosion. This is due to the formation of galvanic couples between the particles and the matrix. Extruded AZ80 magnesium alloy has been investigated by means of scanning Kelvin probe force microscopy (SKPFM) in order to measure the Volta potential of different phases relative to the matrix. The phases present in the alloy have been identified by optical microscopy and scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDXS). Three different phases were observed: Al8Mn5, Mg2Si and Mg17Al12 (ß phase). All phases exhibited positive Volta potentials relative to the matrix indicating a cathodic behaviour. The Volta potential depends on the composition of second phase particles. The Al8Mn5 intermetallics showed the strongest cathodic behaviour. Based on the SKPFM results, it is expected that the cathodic phases are effective sites for the initiation of localized corrosion in extruded AZ80 magnesium alloy.

Original language	English
Pages (from-to)	3551-3557
Number of pages	7
Journal	Electrochimica Acta
Volume	51
DOIs	https://doi.org/10.1016/j.electacta.2005.10.010
Publication status	Published - 2006

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title = "Volta potential of second phase particles in extruded AZ80 magnesium alloy",

abstract = "Magnesium alloys show strong susceptibility to localized corrosion when immersed in aggressive solutions (e.g. chlorides). The existence of second phase particles in the microstructure might represent initiation sites for localized corrosion. This is due to the formation of galvanic couples between the particles and the matrix. Extruded AZ80 magnesium alloy has been investigated by means of scanning Kelvin probe force microscopy (SKPFM) in order to measure the Volta potential of different phases relative to the matrix. The phases present in the alloy have been identified by optical microscopy and scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDXS). Three different phases were observed: Al8Mn5, Mg2Si and Mg17Al12 ({\ss} phase). All phases exhibited positive Volta potentials relative to the matrix indicating a cathodic behaviour. The Volta potential depends on the composition of second phase particles. The Al8Mn5 intermetallics showed the strongest cathodic behaviour. Based on the SKPFM results, it is expected that the cathodic phases are effective sites for the initiation of localized corrosion in extruded AZ80 magnesium alloy.",

author = "F. Andreatta and I. Apachitei and A. Kodentsov and J. Dzwonczyk and J. Duszcyk",

year = "2006",

doi = "10.1016/j.electacta.2005.10.010",

language = "English",

volume = "51",

pages = "3551--3557",

journal = "Electrochimica Acta",

issn = "0013-4686",

publisher = "Elsevier",

}

TY - JOUR

T1 - Volta potential of second phase particles in extruded AZ80 magnesium alloy

AU - Andreatta, F.

AU - Apachitei, I.

AU - Kodentsov, A.

AU - Dzwonczyk, J.

AU - Duszcyk, J.

PY - 2006

Y1 - 2006

N2 - Magnesium alloys show strong susceptibility to localized corrosion when immersed in aggressive solutions (e.g. chlorides). The existence of second phase particles in the microstructure might represent initiation sites for localized corrosion. This is due to the formation of galvanic couples between the particles and the matrix. Extruded AZ80 magnesium alloy has been investigated by means of scanning Kelvin probe force microscopy (SKPFM) in order to measure the Volta potential of different phases relative to the matrix. The phases present in the alloy have been identified by optical microscopy and scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDXS). Three different phases were observed: Al8Mn5, Mg2Si and Mg17Al12 (ß phase). All phases exhibited positive Volta potentials relative to the matrix indicating a cathodic behaviour. The Volta potential depends on the composition of second phase particles. The Al8Mn5 intermetallics showed the strongest cathodic behaviour. Based on the SKPFM results, it is expected that the cathodic phases are effective sites for the initiation of localized corrosion in extruded AZ80 magnesium alloy.

AB - Magnesium alloys show strong susceptibility to localized corrosion when immersed in aggressive solutions (e.g. chlorides). The existence of second phase particles in the microstructure might represent initiation sites for localized corrosion. This is due to the formation of galvanic couples between the particles and the matrix. Extruded AZ80 magnesium alloy has been investigated by means of scanning Kelvin probe force microscopy (SKPFM) in order to measure the Volta potential of different phases relative to the matrix. The phases present in the alloy have been identified by optical microscopy and scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDXS). Three different phases were observed: Al8Mn5, Mg2Si and Mg17Al12 (ß phase). All phases exhibited positive Volta potentials relative to the matrix indicating a cathodic behaviour. The Volta potential depends on the composition of second phase particles. The Al8Mn5 intermetallics showed the strongest cathodic behaviour. Based on the SKPFM results, it is expected that the cathodic phases are effective sites for the initiation of localized corrosion in extruded AZ80 magnesium alloy.

U2 - 10.1016/j.electacta.2005.10.010

DO - 10.1016/j.electacta.2005.10.010

M3 - Article

SN - 0013-4686

VL - 51

SP - 3551

EP - 3557

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Volta potential of second phase particles in extruded AZ80 magnesium alloy

Abstract

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