Effect of heat treatment on corrosion and electrochemical behaviour of Mg-3Nd-0.2Zn-0.4Zr (wt.%) alloy

被引：177

作者：

Chang, Jian-Wei ^{[1
]}

Guo, Xing-Wu ^{[1
]}

Fu, Peng-Huai ^{[1
]}

Peng, Li-Ming ^{[1
]}

Ding, Wen-Jiang ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Natl Engn Res Ctr Light Alloys Net Forming, Shanghai 200030, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2007年 / 52卷 / 09期

关键词：

corrosion behaviour; heat treatment; Mg-Nd-Zn-Zr alloy; polarization curve; electrochemical impedance spectroscopy;

D O I：

10.1016/j.electacta.2006.09.069

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 [应用化学];

摘要：

Corrosion behaviour of Mg-3Nd-0.2Zn-0.4Zr (NZ30K) alloy was investigated in as-cast (F), solution treated (T4) and peak-aged (T6) conditions in 5% NaCl solution by immersion test and electrochemical measurements. The results of immersion test show that the corrosion resistances of NZ30K alloy in three conditions are much higher than that of the commercial AZ91D ingot. NZ30K alloy exhibits better corrosion resistance in T4 temper than it does in the other two conditions due to the dissolution of cathodic compound and higher Nd content in alpha matrix. Although the corrosion products of NZ30K alloy have different morphologies in three conditions, all of them are compact and uniform. The corrosion product is identified as magnesium hydroxide by XRD. The potentiodynamic polarization curves show that the overpotentials of cathodic hydrogen evolution reaction on NZ30K-T4 and NZ30K-T6 are much higher than on NZ30K-F, and the anodic curves are characterized by clear current plateaus due to the protective corrosion film formed on the surface of the alloy. The results of EIS also confirm that the heat treatment is beneficial to the improvement of the corrosion resistance for NZ30K alloy. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：3160 / 3167

页数：8

共 34 条

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