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Influence of Minor Zn Addition on Precipitation Behavior and Intergranular Corrosion Properties of Al-Mg-Si Alloy

机译：微量锌对Al-Mg-Si合金析出行为和晶间腐蚀性能的影响

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摘要

The effect of 0.2 wt.% Zn addition on microstructure, age hardening and intergranular corrosion (IGC) properties of Al-Mg-Si alloy were investigated by scanning electron microscope, transmission electron microscope, hardness testing, and electrochemistry testing. The results showed that the addition of Zn can accelerate the transformation of GP zones into β″, and make the intragranular precipitates become smaller and with higher density. This is beneficial to the precipitation strengthening of the alloy, leading to obtaining higher hardness and enhancing the age hardening response. The peak hardness of the alloy with the addition of Zn is 125.8 HV which means increasing the hardness by 12.7 HV, compared with the alloy without Zn. However, the addition of Zn makes the precipitate-free zone (PFZ) of the alloy wider, and coarsens the grain boundary precipitates slightly, which result in the reduction of IGC resistance of Al-Mg-Si alloy. The maximum corrosion depth of the Zn-containing alloy is 121.3 μm in the peak age condition, which is 35.7 μm deeper than the alloy without Zn. The result of the potentiodynamic polarization curves also demonstrated the increase of IGC sensitivity. The corrosion current density of the alloy with added Zn is 0.595 μA/cm in the peak age condition, while that for the alloy without Zn is 0.199 μA/cm .
机译：通过扫描电子显微镜，透射电子显微镜，硬度测试和电化学测试研究了添加0.2 wt。％Zn对Al-Mg-Si合金的组织，时效硬化和晶间腐蚀（IGC）性能的影响。结果表明，Zn的添加可以促进GP区向β”的转变，并使晶内析出物变小，密度增大。这有利于合金的沉淀强化，导致获得更高的硬度并增强时效硬化响应。添加锌的合金的峰值硬度为125.8 HV，这意味着与不添加锌的合金相比，硬度增加了12.7 HV。然而，Zn的添加使合金的无沉淀区（PFZ）变宽，并使晶界沉淀稍微粗化，这导致Al-Mg-Si合金的IGC电阻降低。在峰值时效条件下，含锌合金的最大腐蚀深度为121.3μm，比不含锌的合金深35.7μm。电位动力学极化曲线的结果也证明了IGC灵敏度的增加。在峰值时效条件下，添加锌的合金的腐蚀电流密度为0.595μA/ cm，而没有锌的合金的腐蚀电流密度为0.199μA/ cm。

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