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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 welding with Zn Al-Mg alloy and the effect of post-weld heat treatment on the corrosion behavior of friction stir welding alloy were studied. The results show that the maximum corrosion depth and dominant corrosion pattern of the different welding zones after the post-weld heat treatment obviously change with the increase of Zn content. The addition of Zn changed the dominant corrosion mode from intergranular corrosion to pitting corrosion. Compared with the work-hardened alloy, the age-hardening alloy has a serious galvanic corrosion tendency. For precipitation-strengthened Al-Mg-Zn alloys, this is closely related to the formation of discontinuous grain boundary precipitates and abundant intragranular precipitates, whereas for Zn-free Al-Mg alloys, With the continuous distribution of the grain boundary β-AlMg phase correlation.