Effect of Mn content on the microstructure and corrosion resistance of Al-Cu-Mg-Mn alloys

被引：35

作者：

Fu, Junwei ^{[1
,2
]}

Cui, Kai ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China

[2] Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Marine Corros & Protect, Qingdao 266237, Peoples R China

[3] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 896卷

关键词：

Al-Cu-Mg-Mn alloy; Aging treatment; Corrosion resistance; Potentiodynamic polarization; Electrochemical impedance spectroscopy; BEHAVIOR; ALUMINUM; STRENGTH; PLASMA; ZN;

D O I：

10.1016/j.jallcom.2021.162903

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Effect of Mn content on the microstructure and corrosion resistance of Al-Cu-Mg-Mn alloys was examined by optical microscope (OM), scanning electron microscope (SEM), tensile tests, pitting corrosion and electrochemical tests. It is shown that increase of Mn content can accelerate the aging process of the Al-CuMg-Mn alloys, which is beneficial to shorten heat treatment time. Polarization curves indicate that the corrosion current density and corrosion rate of Al-4Cu-2Mg-1.2Mn alloy are the lowest compared with Al4Cu-2Mg-0.6Mn and Al-4Cu-2Mg-0.9Mn alloys for both the as-cast and heat-treated conditions. Electrochemical impedance spectroscopy (EIS) tests also demonstrate that Al-4Cu-2Mg-1.2Mn alloy displays the highest resistance. The maximum pitting corrosion depth of the as-aged Al-4Cu-2Mg-1.2Mn and Al-4Cu-2Mg-0.6Mn alloys is about 65 mu m and 110 mu m, respectively. Therefore, Mn addition can improve the mechanical properties and corrosion resistance of the Al-Cu-Mg alloys. (c) 2021 Elsevier B.V. All rights reserved.

引用

页数：10

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