Influence of second phase particles on initial electrochemical properties of AA7010-T76

被引：74

作者：

Wloka, Joachim ^{[1
]}

Buerklin, Gotthold ^{[1
]}

Virtanen, Sannakaisa ^{[1
]}

机构：

[1] Univ Erlangen Nurnberg, Dept Mat Sci, D-91058 Erlangen, Germany

来源：

ELECTROCHIMICA ACTA | 2007年 / 53卷 / 04期

关键词：

initiation of corrosion; Mg2Si phase; Al-Zn-Mg-Cu alloys; microcapillary technique;

D O I：

10.1016/j.electacta.2007.09.004

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：

The initial behavior of the open-circuit potential of differently prepared AA7010 samples was investigated using conventional immersion experiments and microcapillary experiments. For macroscopic samples a strong increase of the open-circuit potential can be observed, which is due to selective magnesium dissolution from the Mg2Si phase leaving a remnant silicon oxide particle. This silicon oxide particle is smaller than the initial Mg2Si phase and thus a micro-crevice is formed, being the initiation site of localized corrosion of the surrounding matrix. Optical micrographs, SEM and EDX confirm this interpretation of the open-circuit potential behavior. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：2055 / 2059

页数：5

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