The origin of passivity in aluminum-manganese solid solutions

被引：25

作者：

Chen, Jia ^{[1
]}

Xiao, Jianwei ^{[2
]}

Poplawsky, Jonathan ^{[3
]}

Michel, F. Marc ^{[4
]}

Deng, Chuang ^{[2
]}

Cai, Wenjun ^{[1
]}

机构：

[1] Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA

[2] Univ Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada

[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, POB 2009, Oak Ridge, TN 37831 USA

[4] Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA

来源：

CORROSION SCIENCE | 2020年 / 173卷 / 173期

基金：

美国国家科学基金会;

关键词：

Al alloys; Corrosion; Atom probe tomography; X-ray photoelectron spectroscopy; Atomistic simulation; CORROSION-RESISTANCE; ATOM-PROBE; AL-W; TRIBOCORROSION RESISTANCE; PITTING CORROSION; MN; BEHAVIOR; IMPEDANCE; DYNAMICS; ALLOYS;

D O I：

10.1016/j.corsci.2020.108749

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of manganese on the aqueous corrosion of aluminum-manganese alloys were investigated by experiments and atomistic simulations. Electrochemical measurements, x-ray photoelectron spectroscopy, and atom probe tomography analysis indicate that manganese addition enhanced the corrosion resistance of aluminum without participating in the surface oxidation. The selective dissolution of manganese was believed to increase the free volume at the metal/oxide interface to facilitate the formation of a denser, thinner oxide layer with closer to stoichiometry composition. Atomistic simulations showed that the oxide layer compactness increased, and defect density decreased with increasing free volume content in Al, resulting in enhanced barrier characteristics.

引用

页数：13

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