Improvement in corrosion characteristics of AZ31 Mg alloy by square pulse anodizing between transpassive and active regions

被引：36

作者：

Choi, Yun-Il ^{[1
]}

Salman, Salah ^{[2
,3
]}

Kuroda, K. ^{[2
]}

Okido, M. ^{[2
]}

机构：

[1] Nagoya Univ, Dept Mat Sci & Engn, Grad Sch 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 11370, Cairo, Egypt

来源：

CORROSION SCIENCE | 2012年 / 63卷

关键词：

Magnesium; Anodic films; Polarization; EIS; Pitting corrosion; MAGNESIUM ALLOY; RESISTANCE; IMPEDANCE; OXIDATION; FILMS; ELECTROLYTE; SILICATE;

D O I：

10.1016/j.corsci.2012.02.010

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

Anodizing was carried out in 2 M NaOH with square pulses of different duty ratios between the transpassive (10 V-Ag/AgCl) and active regions (-1.35 V-Ag/AgCl) of AZ31 Mg alloy. It was found that, a duty ratio of 91 for 600s afforded the highest E-pit of -1.366 V-A/AgaCl, lowest i(corr), of 17.06 mu A cm(-2), and highest R-p of 0.46 k Omega cm(2) in 0.1 M NaCl. Furthermore, the micro-pores were effectively filled with anodic films by the pulse potentials, thus the surface porosity was decreased approximately 11 times than that obtained with a constant potential. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：5 / 11

页数：7

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