Microstructure and corrosion resistance of Sm-containing Al-Mn-Si-Fe-Cu alloy

• Main Authors: Han Yuyin, Ding Dongyan, Du Jiandi, Gao Yongjin
• Format: Article
• Language: English
• Published: Academic Journals Center of Shanghai Normal University 2017-12-01
• Series: Journal of Shanghai Normal University (Natural Sciences)
• Subjects: aluminum alloy; rare earth element; Sm; corrosion resistance
• Online Access: http://qktg.shnu.edu.cn/zrb/shsfqkszrb/ch/reader/view_abstract.aspx?file_no=20170606&flag=1

Optimizing alloy composition is an effective way to improve physical and chemical properties of automobile heat exchanger materials.A Sm-containing Al-Mn-Si-Fe-Cu alloy was investigated through transmission electron microscopy,scanning electron microscopy,and electrochemical measurement.Experimental results indicated that main phases distributed in the alloy wereα-Al(Mn,Fe)Si,Al₂Sm and Al₁₀Cu₇Sm₂.Alloying with Sm element could refine the precipitated α-Al(Mn,Fe)Si phase.Polarization testing results indicated that the corrosion surfacewas mainly composed of pitting pits and corrosion products.Sea water acetic acid test(SWAAT) showed that corrosion loss increased first and then slowed downwith increase of the corrosion time.