A Positron annihilation study of corrosion of aluminum and aluminum alloy by NaOH

Y. C. Wu; T. Zhai; P. G. Coleman

doi:10.1007/s11661-011-0806-9

A Positron annihilation study of corrosion of aluminum and aluminum alloy by NaOH

Y. C. Wu
, T. Zhai
, P. G. Coleman

Chemical and Materials Engineering

Producción científica: Article › revisión exhaustiva

12 Citas (Scopus)

Resumen

Corrosion of fully-annealed pure aluminum and a continuous-cast AA2037 aluminum alloy (solutionized and water quenched) in a 1M NaOH solution for various periods of time were analyzed with positron beam-based Doppler broadening spectroscopy. By varying the energy of the incident positron beam, corrosion-induced defects at different depths from the surface were detected. It was found that the Doppler-broadened annihilation line-width parameter was significantly increased near the surface of pure aluminum after corrosion, probably due to the interaction between positrons and nanometer-sized voids formed near the aluminum surface during corrosion. Examination by atomic force microscopy indicated that many pits were formed on the aluminum surface after corrosion. In contrast, a significant decrease in the linewidth parameter was observed in AA2037 alloy after corrosion and interpreted as being caused by copper enrichment at the metal-oxide interface during corrosion; such enrichment at large cavity sites was confirmed by energy dispersion spectrometry.

Idioma original	English
Páginas (desde-hasta)	2823-2831
Número de páginas	9
Publicación	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volumen	43
N.º	8
DOI	https://doi.org/10.1007/s11661-011-0806-9
Estado	Published - ago 2012

Nota bibliográfica

Funding Information:
This research is supported by the National Natural Science Foundation of China under grants 10975110, 51071111 and 11175136, and by the State Key Laboratory of Solidification Processing in NWPU under Grant No. SKLSP201004. One of the authors (TZ) was sponsored by the US NSF through a Career Award (Grant No. DMR-0645246).

Financiación

This research is supported by the National Natural Science Foundation of China under grants 10975110, 51071111 and 11175136, and by the State Key Laboratory of Solidification Processing in NWPU under Grant No. SKLSP201004. One of the authors (TZ) was sponsored by the US NSF through a Career Award (Grant No. DMR-0645246).

Financiadores	Número del financiador
National Science Foundation (NSF)	DMR-0645246
National Natural Science Foundation of China (NSFC)	10975110, 51071111, 11175136
State Key Laboratory of Solidification Processing	SKLSP201004

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

Acceder al documento

10.1007/s11661-011-0806-9

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title = "A Positron annihilation study of corrosion of aluminum and aluminum alloy by NaOH",

abstract = "Corrosion of fully-annealed pure aluminum and a continuous-cast AA2037 aluminum alloy (solutionized and water quenched) in a 1M NaOH solution for various periods of time were analyzed with positron beam-based Doppler broadening spectroscopy. By varying the energy of the incident positron beam, corrosion-induced defects at different depths from the surface were detected. It was found that the Doppler-broadened annihilation line-width parameter was significantly increased near the surface of pure aluminum after corrosion, probably due to the interaction between positrons and nanometer-sized voids formed near the aluminum surface during corrosion. Examination by atomic force microscopy indicated that many pits were formed on the aluminum surface after corrosion. In contrast, a significant decrease in the linewidth parameter was observed in AA2037 alloy after corrosion and interpreted as being caused by copper enrichment at the metal-oxide interface during corrosion; such enrichment at large cavity sites was confirmed by energy dispersion spectrometry.",

author = "Wu, \{Y. C.\} and T. Zhai and Coleman, \{P. G.\}",

note = "Funding Information: This research is supported by the National Natural Science Foundation of China under grants 10975110, 51071111 and 11175136, and by the State Key Laboratory of Solidification Processing in NWPU under Grant No. SKLSP201004. One of the authors (TZ) was sponsored by the US NSF through a Career Award (Grant No. DMR-0645246).",

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AU - Wu, Y. C.

AU - Zhai, T.

AU - Coleman, P. G.

N1 - Funding Information: This research is supported by the National Natural Science Foundation of China under grants 10975110, 51071111 and 11175136, and by the State Key Laboratory of Solidification Processing in NWPU under Grant No. SKLSP201004. One of the authors (TZ) was sponsored by the US NSF through a Career Award (Grant No. DMR-0645246).

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Y1 - 2012/8

N2 - Corrosion of fully-annealed pure aluminum and a continuous-cast AA2037 aluminum alloy (solutionized and water quenched) in a 1M NaOH solution for various periods of time were analyzed with positron beam-based Doppler broadening spectroscopy. By varying the energy of the incident positron beam, corrosion-induced defects at different depths from the surface were detected. It was found that the Doppler-broadened annihilation line-width parameter was significantly increased near the surface of pure aluminum after corrosion, probably due to the interaction between positrons and nanometer-sized voids formed near the aluminum surface during corrosion. Examination by atomic force microscopy indicated that many pits were formed on the aluminum surface after corrosion. In contrast, a significant decrease in the linewidth parameter was observed in AA2037 alloy after corrosion and interpreted as being caused by copper enrichment at the metal-oxide interface during corrosion; such enrichment at large cavity sites was confirmed by energy dispersion spectrometry.

AB - Corrosion of fully-annealed pure aluminum and a continuous-cast AA2037 aluminum alloy (solutionized and water quenched) in a 1M NaOH solution for various periods of time were analyzed with positron beam-based Doppler broadening spectroscopy. By varying the energy of the incident positron beam, corrosion-induced defects at different depths from the surface were detected. It was found that the Doppler-broadened annihilation line-width parameter was significantly increased near the surface of pure aluminum after corrosion, probably due to the interaction between positrons and nanometer-sized voids formed near the aluminum surface during corrosion. Examination by atomic force microscopy indicated that many pits were formed on the aluminum surface after corrosion. In contrast, a significant decrease in the linewidth parameter was observed in AA2037 alloy after corrosion and interpreted as being caused by copper enrichment at the metal-oxide interface during corrosion; such enrichment at large cavity sites was confirmed by energy dispersion spectrometry.

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JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

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A Positron annihilation study of corrosion of aluminum and aluminum alloy by NaOH

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ASJC Scopus subject areas

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