Microstructure and corrosion behavior of Al–10%Mg2Si cast alloy after heat treatment

Microstructure and corrosion behavior of Al–10%Mg2Si cast alloy after heat treatment
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显微组织%20and%20腐蚀%20行为%20of%20Al~10%Mg2Si%20cast%20合金%20after%20heat%20treatment

DOI:
10.1016/j.matchar.2016.10.027
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发表时间:
2016-12
影响因子:
4.7
通讯作者:
Li Huijun
Li Huijun
中科院分区:
材料科学1区
文献类型:
--
作者:
Li Chong;Sun Jiayue;Li Zedi;Gao Zhiming;Liu Yongchang;Yu Liming;Li Huijun

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研究了Al-10%Mg2Si合金热处理后的显微组织和腐蚀行为。对于 3.5 wt.% NaCl 溶液中的 Al–10%Mg2Si,α-Al 相的腐蚀在(Al + Mg2Si)二元共晶区开始,伴随着 Mg2Si 相的电化学极性变化,并沿着共晶 Mg2Si 析出物扩展。热处理后,共晶Mg2Si从长片状和棒状转变为短纤维、盘状和球化颗粒。共晶Mg2Si相的转变抑制了腐蚀坑的快速扩展,从而提高了Al-10%Mg2Si合金的耐腐蚀性能。
The microstructure and corrosion behavior of Al–10%Mg2Si alloy after heat treatment are investigated. For Al–10%Mg2Si in 3.5 wt.% NaCl solution, corrosion ofα-Al phase initiates in (Al + Mg2Si) binary eutectic zones with electrochemical polarity change of Mg2Si phase, and expands along the eutectic Mg2Si precipitates. After heat treatment, eutectic Mg2Si transforms from long flakes and rods to short fibers, disks and spheroidized particles. The transformation of eutectic Mg2Si phase suppresses the rapid expansion of corrosion pits, which leads to enhancing the corrosion resistance of Al–10%Mg2Si alloy.
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