Influence of microstructure and composition on the corrosion behaviour of Mg/Al alloys in chloride media

被引：347

作者：

Pardo, A. ^{[1
]}

Merino, M. C. ^{[1
]}

Coy, A. E. ^{[1
]}

Viejo, F. ^{[2
]}

Arrabal, R. ^{[2
]}

Feliu, S., Jr. ^{[3
]}

机构：

[1] Univ Complutense, Fac Quim, Dept Ciencia Mat, E-28040 Madrid, Spain

[2] Univ Manchester, Sch Mat, Ctr Corros & Protect, Manchester M60 1QD, Lancs, England

[3] CSIC, Ctr Nacl Invest Met, E-28040 Madrid, Spain

来源：

ELECTROCHIMICA ACTA | 2008年 / 53卷 / 27期

关键词：

magnesium alloys; marine corrosion; aluminium; chloride; electrochemical impedance spectroscopy;

D O I：

10.1016/j.electacta.2008.06.001

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The influence of the microstructure and aluminium content of commercial AZ31, AZ80 and AZ91D magnesium alloys was evaluated in terms of their corrosion behaviour in an aerated 3.5 wt.% NaCl solution at 25 degrees C. The corrosion process was monitored by electrochemical impedance spectroscopy (EIS). The surface was characterized by scanning electron microscopy (SEM), scanning Kelvin probe force microscopy (SKPFM) and low-angle X-ray diffraction (XRD). The extent of corrosion damage was strongly dependent on the aluminium content and alloy microstructure. Two key factors were observed for the lowest corrosion rates, which occurred for the AZ80 and AZ91D two-phase alloys: the aluminium enrichment on the corroded surface for the AZ80 alloy, and the beta-phase (Mg17Al12), which acted as a barrier for the corrosion progress for the AZ80 and AZ91D alloys. Surface potential maps suggested that. between the beta-phase and the alpha-matrix, the galvanic coupling was not significant. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：7890 / 7902

页数：13

共 48 条

[1] Environmental behavior of magnesium and magnesium alloys [J].

Alves, H ;

Koster, U ;

Aghion, E ;

Eliezer, D .

MATERIALS TECHNOLOGY, 2001, 16 (02) :110-126

[2] Evaluation of microstructural effects on corrosion behaviour of AZ91D magnesium alloy [J].

Ambat, R ;

Aung, NN ;

Zhou, W .

CORROSION SCIENCE, 2000, 42 (08) :1433-1455

[3] Studies on the influence of chloride ion and pH on the corrosion and electrochemical behaviour of AZ91D magnesium alloy [J].

Ambat, R ;

Aung, NN ;

Zhou, W .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 2000, 30 (07) :865-874

[4] Volta potential of second phase particles in extruded AZ80 magnesium alloy [J].

Andreatta, F ;

Apachitei, I ;

Kodentsov, AA ;

Dzwonczyk, J ;

Duszczyk, J .

ELECTROCHIMICA ACTA, 2006, 51 (17) :3551-3557

[5] DEVELOPMENT OF CORROSION-RESISTANT MAGNESIUM ALLOYS .2. STRUCTURE OF CORROSION PRODUCTS ON RAPIDLY SOLIDIFIED MG-16AL ALLOYS [J].

BALIGA, CB ;

TSAKIROPOULOS, P .

MATERIALS SCIENCE AND TECHNOLOGY, 1993, 9 (06) :513-519

[6] About some corrosion mechanisms of AZ91D magnesium alloy [J].

Ballerini, G ;

Bardi, U ;

Bignucolo, R ;

Ceraolo, G .

CORROSION SCIENCE, 2005, 47 (09) :2173-2184

[7] Corrosion resistance of plasma-anodized AZ91D magnesium alloy by electrochemical methods [J].

Barchiche, C. -E. ;

Rocca, E. ;

Juers, C. ;

Hazan, J. ;

Steinmetz, J. .

ELECTROCHIMICA ACTA, 2007, 53 (02) :417-425

[8] RETRACTED: Electrochemical behavior of magnesium alloys strained in buffer solutions (Retracted article. See vol. 52, pg. 6395, 2007) [J].

Ben-Hamu, G. ;

Eliezer, A. ;

Gutman, E. M. .

ELECTROCHIMICA ACTA, 2006, 52 (01) :304-313

[9] On the impedance plane displays for irreversible electrode reactions based on the stability conditions of the steady-state. I. One state variable besides electrode potential [J].

Cao, Chu-Nan .

Electrochimica Acta, 1990, 35 (05)

[10] ON THE IMPEDANCE PLANE DISPLAYS FOR IRREVERSIBLE ELECTRODE-REACTIONS BASED ON THE STABILITY CONDITIONS OF THE STEADY-STATE .2. 2 STATE VARIABLES BESIDES ELECTRODE POTENTIAL [J].

CAO, CN .

ELECTROCHIMICA ACTA, 1990, 35 (05) :837-844

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