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搅拌摩擦焊接Al-Mg-(Zn)合金的腐蚀行为(英文) 被引量:3

Corrosion Behavior of Friction Stir Welded Al-Mg-(Zn) Alloys
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摘要 研究了搅拌摩擦焊接含Zn Al-Mg合金的腐蚀行为及焊后热处理对搅拌摩擦焊接合金腐蚀行为的影响。结果表明,经焊后热处理后不同焊接区的最大腐蚀深度和主导腐蚀模式随Zn含量增加而发生明显变化。Zn的加入使主导腐蚀模式由晶间腐蚀变为点蚀。与加工硬化态合金相比,时效硬化态合金具有严重的电偶腐蚀倾向。对于析出强化Al-Mg-Zn合金而言,这在很大程度上与不连续分布的晶界析出相及丰富的晶内析出相的形成密切相关,而对无Zn的Al-Mg合金,则与连续分布的晶界β-AlMg相相关。 The corrosion behavior of friction stir welded Zn-modified Al-Mg alloys was investigated as well as the effects of pre-weld temper conditions on the corrosion behavior of the friction stir welded alloys. Results indicate that both maximum corrosion depth and dominating corrosion mode in different weld regions after post welding heat treatment show obvious variations with an increase in the Zn content. With Zn additions the dominating corrosion mode changes from intergranular corrosion to pitting corrosion,and the severe galvanic corrosion tendency obviously occurs in the precipitation hardened alloys compared to that of the strain hardened alloy. This would be greatly related to the formation of discontinuously distributed grain boundary precipitates as well as abundant intragranular precipitates(mainly T-AlZ nM gC u phase) in the precipitation hardened Al-Mg-Zn alloys while it is associated with the continuously distributed β-AlM g phase along grain boundary in the Zn-free Al-Mg alloys.
作者 侯陇刚 于佳佳 张迪 庄林忠 周利 张济山 Hou Longgang Yu Jiajia Zhang Di Zhuang Linzhong Zhou Li Zhang Jishan(State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China TaTa Steel, 1970 CA Umuiden, The Netherlands Shandong Provincial Key Laboratory of Special Welding, Harbin Institute of Technology at Weihai, Weihai 264209, China)
出处 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2017年第9期2437-2444,共8页 Rare Metal Materials and Engineering
基金 National Natural Science Foundation of China(51301017,51571013) Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,China State Key Lab of Advanced Metals and Materials,China(2014Z-09)
关键词 铝合金 搅拌摩擦焊接 晶间腐蚀 析出 组织 Al alloy friction stir welding intergranular corrosion precipitate microstructure
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