Corrosion of Mg-9Al alloy with minor alloying elements (Mn, Nd, Ca, Y and Sn)
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Corrosion of Mg-9Al alloy with minor alloying elements (Mn, Nd, Ca, Y and Sn). / Mingo, B.; Arrabal, R.; Mohedano, M. et al.
In: Materials and Design, Vol. 130, 15.09.2017, p. 48-58.Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Corrosion of Mg-9Al alloy with minor alloying elements (Mn, Nd, Ca, Y and Sn)
AU - Mingo, B.
AU - Arrabal, R.
AU - Mohedano, M.
AU - Mendis, C. L.
AU - del Olmo, R.
AU - Matykina, E.
AU - Hort, N.
AU - Merino, M. C.
AU - Pardo, A.
PY - 2017/9/15
Y1 - 2017/9/15
N2 - Microstructure and corrosion behaviour of a Mg-9Al alloy with minor alloying additions (Mn, Y, Nd, Ca and Sn) are evaluated. All of the additions form Al-rich intermetallics with varying amounts of Fe, while Ca and Sn are also incorporated into the eutectic β-phase (β-Mg17Al12). Special attention is given to the surface potential values of the microconstituents, which are related to the formation of microgalvanic couples. Scanning Kelvin Probe Force Microscopy (SKPFM) measurements revealed that all the alloying elements, except Sn, reduced the potential difference between the secondary phases and the matrix, which is the main reason for the improvement of the corrosion resistance of Mn-, Y- and Nd-modified alloys. The beneficial effect of Ca is additionally related to the microstructure refinement and an increased area fraction of the β-phase.
AB - Microstructure and corrosion behaviour of a Mg-9Al alloy with minor alloying additions (Mn, Y, Nd, Ca and Sn) are evaluated. All of the additions form Al-rich intermetallics with varying amounts of Fe, while Ca and Sn are also incorporated into the eutectic β-phase (β-Mg17Al12). Special attention is given to the surface potential values of the microconstituents, which are related to the formation of microgalvanic couples. Scanning Kelvin Probe Force Microscopy (SKPFM) measurements revealed that all the alloying elements, except Sn, reduced the potential difference between the secondary phases and the matrix, which is the main reason for the improvement of the corrosion resistance of Mn-, Y- and Nd-modified alloys. The beneficial effect of Ca is additionally related to the microstructure refinement and an increased area fraction of the β-phase.
KW - Corrosion
KW - EPMA
KW - Magnesium
KW - Rare earth
KW - SKPFM
KW - Volta potential
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85019544566&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2017.05.048
DO - 10.1016/j.matdes.2017.05.048
M3 - Journal articles
AN - SCOPUS:85019544566
VL - 130
SP - 48
EP - 58
JO - Materials and Design
JF - Materials and Design
SN - 0264-1275
ER -