Impact of microgalvanic corrosion on the degradation morphology of WE43 and pure magnesium under exposure to simulated body fluid

被引：101

作者：

Kalb, H. ^{[1
]}

Rzany, A. ^{[1
]}

Hensel, B. ^{[1
]}

机构：

[1] Univ Erlangen Nurnberg, Ctr Med Phys & Technol, D-91052 Erlangen, Germany

来源：

CORROSION SCIENCE | 2012年 / 57卷

关键词：

Magnesium; Zirconium; SEM; Cathodic protection; Anodic dissolution; Hydrogen overpotential; LOCALIZED CORROSION; OXIDE-FILMS; BEHAVIOR; ALLOY;

D O I：

10.1016/j.corsci.2011.12.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Corrosion of magnesium alloys was studied during exposure to simulated body fluid (SBF). Microgalvanic processes dominate degradation morphology and formation of the corrosion/conversion layer. Localized corrosion with vigorous hydrogen evolution was observed at zirconium- and iron-rich precipitates that act as micro-cathodes. These are surrounded by volcano-shaped deposits of Mg(OH)(2). Circular areas around cathodic centers were found to be protected from corrosion, while bulk degradation takes place in between. In SBF, conversion to a corrosion double layer was demonstrated. Differences observed for WE43 and pure magnesium (Mg) are discussed within the framework of a comprehensive model of the mechanisms of corrosion. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：122 / 130

页数：9

共 31 条

[1] Corrosion of high purity Mg, Mg2Zn0.2Mn, ZE41 and AZ91 in Hank's solution at 37 °C [J].

Abidin, Nor Ishida Zainal ;

Atrens, Aleks D. ;

Martin, Darren ;

Atrens, Andrej .

CORROSION SCIENCE, 2011, 53 (11) :3542-3556

[2] Corrosion resistance of WE43 and AZ91D magnesium alloys with phosphate PEO coatings [J].

Arrabal, R. ;

Matykina, E. ;

Viejo, F. ;

Skeldon, P. ;

Thompson, G. E. .

CORROSION SCIENCE, 2008, 50 (06) :1744-1752

[3] Corrosion mechanism applicable to biodegradable magnesium implants [J].

Atrens, Andrej ;

Liu, Ming ;

Abidin, Nor Ishida Zainal .

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, 2011, 176 (20) :1609-1636

[4] The relation between microstructure and corrosion behavior of Mg-Y-RE-Zr alloys [J].

Ben-Hamu, G. ;

Eliezer, D. ;

Shin, K. S. ;

Cohen, S. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2007, 431 (1-2) :269-276

[5] Relationship between heat treatment and corrosion behaviour of Mg-3.0%Nd-0.4%Zr magnesium alloy [J].

Chang Jian-Wei ;

Guo Xing-Wu ;

Fu Peng-Huai ;

Peng Li-Ming ;

Ding Wen-Jiang .

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, 2007, 17 (06) :1152-1157

[6] Susceptibility of rare-earth-magnesium alloys to micro-galvanic corrosion [J].

Coy, A. E. ;

Viejo, F. ;

Skeldon, P. ;

Thompson, G. E. .

CORROSION SCIENCE, 2010, 52 (12) :3896-3906

[7]

Geary B., 1990, P INT C ADV AL MAGN, P773

[8] General and localized corrosion of magnesium alloys: A critical review [J].

Ghali, E ;

Dietzel, W ;

Kainer, KU .

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2004, 13 (01) :7-23

[9]

Housh S., 1990, PROPERTIES SELECTION, V3, P480

[10]

Karimzadeh H., 1998, MAGNESIUM ALLOYS THE, P403

← 1 2 3 4 →