Electrochemical behaviour of TiO2 reinforced Al 7075 composite

被引：40

作者：

Karunanithi, R. ^{[1
]}

Bera, Supriya ^{[1
]}

Ghosh, K. S. ^{[1
]}

机构：

[1] Natl Inst Technol, Dept Met & Mat Engn, Durgapur 713209, India

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2014年 / 190卷

关键词：

Al; 7075; alloy; TiO2; reinforcement; Metal matrix composites; TEM; Electrochemical behaviour; CORROSION BEHAVIOR; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; VOLUME FRACTION; MICROSTRUCTURES; PARTICLES; AA6061; FILM;

D O I：

10.1016/j.mseb.2014.06.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructures of sintered Al 7075 alloy and Al 7075 alloy reinforced with varying TiO2 composites exhibited uniform distribution of TiO2 particles, but clustering and porosity have increased with TiO2 content. TEM micrographs of the Al 7075 alloy and Al 7075 +TiO2 composite of peak aged T6 (PA) temper showed some coarse and numerous very fine eta' (MgZn2) precipitates, and equilibrium eta (MgZn2) precipitates along the grain boundaries. Potentiodynamic electrochemical polarisation studies on the Al 7075 alloy of different tempers and Al 7075 +TiO2 composites in 3.5 wt.% NaCl solution showed that the corrosion potentials (E-corr) have shifted towards noble direction with the addition of TiO2, and there is an increase of corrosion current density (i(corr)) beyond 10 vol.% TiO2 in the composites. This is attributed to the increase in particle-matrix interface areas enhancing pitting corrosion. Optical micrographs of the corroded surface of 30% TiO2 composites exhibited maximum pitting damage. (c) 2014 Elsevier B.V. All rights reserved.

引用

页码：133 / 143

页数：11

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