Synergistic corrosion protection for AZ31 Mg alloy by anodizing and stannate post-sealing treatments

被引：31

作者：

Choi, Yun-Il ^{[1
]}

Salman, Salah ^{[2
,3
]}

Kuroda, Kensuke ^{[2
]}

Okido, Masazumi ^{[2
]}

机构：

[1] Nagoya Univ, Grad Sch Engn, Dept Mat Sci & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[2] Nagoya Univ, EcoTopia Sci Inst, Nagoya, Aichi 4648603, Japan

[3] Al Azhar Univ, Grad Sch Engn, Nasr City 11371, Cairo, Egypt

来源：

ELECTROCHIMICA ACTA | 2013年 / 97卷

关键词：

AZ31; Anodizing; Post-sealing; Stannate; Corrosion protection; MAGNESIUM ALLOYS; PHOTOELECTRON-SPECTROSCOPY; ATMOSPHERIC CORROSION; PURE MAGNESIUM; IMPEDANCE; COATINGS; FILM; RESISTANCE; PHASE;

D O I：

10.1016/j.electacta.2013.03.001

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Stannate post-treatment of as-anodized AZ31 Mg alloy was carried out in 0.4 M sodium stannate 3-hydrate (Na2SnO3-3H(2)O) at 350 K. It effectively leveled the porous anodized coating by depositing a SnO2 superficial layer with a thickness of 0.4 mu m. After the surface sealing, the mass transport impedance at low frequency was controlled by the ideal capacitance dispersion during the initial immersion; thus, slow corrosion kinetics was achieved. This impedance behavior might account for the ideally polarizable cathodic behavior of the electrode with overpotential. As a consequence, the stannate post-treatment afforded higher R-p, E-corr, and E-pit values throughout the immersion in 0.1 M NaCl. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：313 / 319

页数：7

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