Effects of Retrogression Reaging on Microstructure and Electrochemical Corrosion Resistance of 6082 Aluminum Alloy

Wang Xin; Liu Chunpeng; LüHaibo; Suo Zhongyuan; Wang Yijian

doi:10.15980/j.tzzz.2019.01.023

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Effects of Retrogression Reaging on Microstructure and Electrochemical Corrosion Resistance of 6082 Aluminum Alloy
Vol. 39, Issue 1, Pages: 84-87(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.01.023

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[1]王鑫,刘春鹏,吕海波,索忠源,王毅坚.回归再时效对6082合金组织及电化学腐蚀性的影响[J].特种铸造及有色合金,2019,39(01):84-87.

Wang Xin, Liu Chunpeng, LüHaibo, et al. Effects of Retrogression Reaging on Microstructure and Electrochemical Corrosion Resistance of 6082 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 39(1):84-87(2019)
[1]王鑫,刘春鹏,吕海波,索忠源,王毅坚.回归再时效对6082合金组织及电化学腐蚀性的影响[J].特种铸造及有色合金,2019,39(01):84-87. DOI： 10.15980/j.tzzz.2019.01.023.

Wang Xin, Liu Chunpeng, LüHaibo, et al. Effects of Retrogression Reaging on Microstructure and Electrochemical Corrosion Resistance of 6082 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 39(1):84-87(2019) DOI： 10.15980/j.tzzz.2019.01.023.

摘要

采用电化学方法研究了经不同回归再时效工艺处理的6082铝合金在3.5%的NaCl溶液中的腐蚀行为

通过显微组织、XRD和极化曲线分析发现

6082铝合金组织为α-Al基体上均匀分布且取向明显的β-Mg2Si颗粒及单质Si;回归处理后铝合金基体中几乎没有强化相

再时效晶内析出细小弥散的强化相

晶界上形成粗大断续状的平衡态组织。回归工艺为220℃×40min与220℃×60min时可以提高6082铝合金耐电化学腐蚀性能。

Abstract

The corrosion behavior of 6082 aluminum alloy after different retrogression reaging treatment in 3.5%NaCl solution was analyzed by electrochemical method

microstructural observation

XRD and polarization curves.The results show that the microstructure of 6082 aluminum alloy is composed of a uniform distribution of beta-Mg2 Si particles and elementary Si with obvious orientation on the matrix ofα-Al solid solution.After regression treatment

there are almost no strenghening phases in the aluminum alloy matrix

and then the fine diffuse strengthening phase is precipitated in the grain after reaging treatment

and a large discontinuous equilibrium structure is formed on the grain boundary.The electrochemical corrosion resistance of 6082 aluminium alloy can be improved by the re-aging process of 220℃×40min and 220℃×60min.