Investigation of the corrosion for Mg-xGd-3Y-0.4Zr (x=6,8,10,12 wt%) alloys in a peak-aged condition
Investigation of the corrosion for Mg-xGd-3Y-0.4Zr (x=6,8,10,12 wt%) alloys in a peak-aged condition
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DOI：
10.1016/j.corsci.2007.06.003
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发表时间：
2008-01-01
影响因子：
8.3
通讯作者：
Ding, Wenjiang
中科院分区：
文献类型：
--
作者：
Chang, Jianwei;Guo, Xingwu;Ding, Wenjiang
采用浸泡、盐雾试验和电化学测试方法研究了Mg-6 Gd-3 Y-0.4Zr（GW 63 K）、Mg-8 Gd-3 Y-0.4Zr（GW 83 K）、Mg-10 Gd-3 Y-0.4Zr（GW 103 K）和Mg-12 Gd-3 Y-0.4Zr（GW 123 K）合金在峰值时效状态下在5%NaCl溶液中的腐蚀行为。随着Gd含量从6%增加到10%，Mg-xGd-3 Y-0.4Zr合金的耐蚀性降低，然后从10%增加到12%。通过FE-SEM观察发现，Mg-xGd-3 Y-0.4Zr合金的腐蚀产物由大量细小的直立片状物组成，腐蚀膜的致密性随Gd含量的增加而降低。俄歇电子能谱（AES）分析结果表明，腐蚀膜中富集了Gd和Y。动电位极化曲线表明，GW 63 K和GW 83 K的阴极析氢过电位远高于GW 103 K和GW 123 K。电化学阻抗谱的结果与腐蚀产物的形貌和腐蚀试验的腐蚀速率吻合较好。(c)2007爱思唯尔有限公司保留所有权利。
The corrosion behaviour of Mg-6Gd-3Y-0.4Zr (GW63K), Mg-8Gd-3Y-0.4Zr (GW83K), Mg-10Gd-3Y-0.4Zr (GW103K) and Mg-12Gd-3Y-0.4Zr (GW123K) were investigated in peak-aged condition using immersion and salt spraying tests and electrochemical measurements in 5% NaCl solution. The corrosion resistances of Mg-xGd-3Y-0.4Zr alloys were found to decrease with the increase of Gd content from 6% to 10% and then increase from 10% to 12%. The corrosion products of Mg-xGd-3Y-0.4Zr alloys were discovered to be composed of voluminous tiny erect flakes by FE-SEM, and the compactness of the corrosion films decreases with the increase of Gd content. The results of AES revealed that the corrosion film is enriched with Gd and Y. The potentiodynamic polarization curves showed that the overpotentials of cathodic hydrogen evolution on GW63K and GW83K are much higher than on GW103K and GW123K. The results of EIS are in good agreement with the morphologies of the corrosion products and the corrosion rates of the corrosion tests. (c) 2007 Elsevier Ltd. All rights reserved.