Microstructure characterization of early corrosion behavior of AM60B magnesium alloys

Yongfeng Liu; Jing Jiang; Xudong Xue; Yichu Wu; Tongguang Zhai

doi:10.1007/s11859-012-0857-9

Microstructure characterization of early corrosion behavior of AM60B magnesium alloys

Yongfeng Liu, Jing Jiang, Xudong Xue, Yichu Wu, Tongguang Zhai

Chemical and Materials Engineering

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

1 Scopus citations

Abstract

The microstructures and corrosion behavior of AM60B magnesium alloys, produced by both high-pressure die casting (HPDC) and super vacuum die casting (SVDC) processes, were investigated by a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM), and slow positron beam technique. XRD confirmed that calcium carbonate (CaCOs) deposited on the surface of alloys during the early stages of corrosion, and the deposition rate of CaCO ₃ for SVDC with corrosion time was slower than that of HPDC. SEM observation found that the β -phases in the skin surface of SVDC alloy had a greater volume fraction and more continuous distribution than that of HPDC alloy, leading to lower volume fraction of CaCO ₃ deposited on surface of SVDC alloy for the same corrosion time. The slow positron beam Doppler broadening measurement revealed that the thickness of surface corrosion layer increased with corrosion time. Compared with HPDC alloy, the increase rate of thickness for SVDC alloy is slower, which implied that SVDC alloy exhibited a better corrosion resistance than HPDC alloy.

Original language	English
Pages (from-to)	369-376
Number of pages	8
Journal	Wuhan University Journal of Natural Sciences
Volume	17
Issue number	5
DOIs	https://doi.org/10.1007/s11859-012-0857-9
State	Published - Oct 2012

Bibliographical note

Funding Information:
Received date: 2012-05-26 Foundation item: Supported by the National Natural Science Foundation of China (11175136, 51071111, 10975110) Biography: LIU Yongfeng, male, Master candidate, research direction: corrosion of metal materials. E-mail: [email protected] † To whom correspondence should be addressed. E-mail: [email protected]

Keywords

Calcium carbonate
Corrosion
Magnesium alloy
Microstructure
Positron annihilation

ASJC Scopus subject areas

General

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10.1007/s11859-012-0857-9

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title = "Microstructure characterization of early corrosion behavior of AM60B magnesium alloys",

abstract = "The microstructures and corrosion behavior of AM60B magnesium alloys, produced by both high-pressure die casting (HPDC) and super vacuum die casting (SVDC) processes, were investigated by a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM), and slow positron beam technique. XRD confirmed that calcium carbonate (CaCOs) deposited on the surface of alloys during the early stages of corrosion, and the deposition rate of CaCO 3 for SVDC with corrosion time was slower than that of HPDC. SEM observation found that the β -phases in the skin surface of SVDC alloy had a greater volume fraction and more continuous distribution than that of HPDC alloy, leading to lower volume fraction of CaCO 3 deposited on surface of SVDC alloy for the same corrosion time. The slow positron beam Doppler broadening measurement revealed that the thickness of surface corrosion layer increased with corrosion time. Compared with HPDC alloy, the increase rate of thickness for SVDC alloy is slower, which implied that SVDC alloy exhibited a better corrosion resistance than HPDC alloy.",

keywords = "Calcium carbonate, Corrosion, Magnesium alloy, Microstructure, Positron annihilation",

author = "Yongfeng Liu and Jing Jiang and Xudong Xue and Yichu Wu and Tongguang Zhai",

note = "Funding Information: Received date: 2012-05-26 Foundation item: Supported by the National Natural Science Foundation of China (11175136, 51071111, 10975110) Biography: LIU Yongfeng, male, Master candidate, research direction: corrosion of metal materials. E-mail: [email protected] † To whom correspondence should be addressed. E-mail: [email protected]",

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doi = "10.1007/s11859-012-0857-9",

language = "English",

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AU - Liu, Yongfeng

AU - Jiang, Jing

AU - Xue, Xudong

AU - Wu, Yichu

AU - Zhai, Tongguang

N1 - Funding Information: Received date: 2012-05-26 Foundation item: Supported by the National Natural Science Foundation of China (11175136, 51071111, 10975110) Biography: LIU Yongfeng, male, Master candidate, research direction: corrosion of metal materials. E-mail: [email protected] † To whom correspondence should be addressed. E-mail: [email protected]

PY - 2012/10

Y1 - 2012/10

N2 - The microstructures and corrosion behavior of AM60B magnesium alloys, produced by both high-pressure die casting (HPDC) and super vacuum die casting (SVDC) processes, were investigated by a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM), and slow positron beam technique. XRD confirmed that calcium carbonate (CaCOs) deposited on the surface of alloys during the early stages of corrosion, and the deposition rate of CaCO 3 for SVDC with corrosion time was slower than that of HPDC. SEM observation found that the β -phases in the skin surface of SVDC alloy had a greater volume fraction and more continuous distribution than that of HPDC alloy, leading to lower volume fraction of CaCO 3 deposited on surface of SVDC alloy for the same corrosion time. The slow positron beam Doppler broadening measurement revealed that the thickness of surface corrosion layer increased with corrosion time. Compared with HPDC alloy, the increase rate of thickness for SVDC alloy is slower, which implied that SVDC alloy exhibited a better corrosion resistance than HPDC alloy.

AB - The microstructures and corrosion behavior of AM60B magnesium alloys, produced by both high-pressure die casting (HPDC) and super vacuum die casting (SVDC) processes, were investigated by a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM), and slow positron beam technique. XRD confirmed that calcium carbonate (CaCOs) deposited on the surface of alloys during the early stages of corrosion, and the deposition rate of CaCO 3 for SVDC with corrosion time was slower than that of HPDC. SEM observation found that the β -phases in the skin surface of SVDC alloy had a greater volume fraction and more continuous distribution than that of HPDC alloy, leading to lower volume fraction of CaCO 3 deposited on surface of SVDC alloy for the same corrosion time. The slow positron beam Doppler broadening measurement revealed that the thickness of surface corrosion layer increased with corrosion time. Compared with HPDC alloy, the increase rate of thickness for SVDC alloy is slower, which implied that SVDC alloy exhibited a better corrosion resistance than HPDC alloy.

KW - Calcium carbonate

KW - Corrosion

KW - Magnesium alloy

KW - Microstructure

KW - Positron annihilation

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Microstructure characterization of early corrosion behavior of AM60B magnesium alloys

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