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Effect of mechanical treatment on intergranular corrosion of 6064 alloy bars

机译：机械处理对6064合金棒晶间腐蚀的影响

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摘要

Aluminium Al-Mg-Si-type alloys (6xxx-series) exhibit good mechanical properties, formability, weldability and good corrosion resistance in various environments. They often find use in automotive industry and other applications. Some alloys, however, particularly those with higher copper levels, show increased susceptibility to intergranular corrosion. Intergranular corrosion (IGC) is typically related to the formation of microgalvanic cells between cathodic, more noble phases and depleted (precipitate-free) zones along grain boundaries. It is encountered mainly in AlMgSi alloys containing Cu, where it is thought to be related to the formation Q-phase precipitates (Al4Mg8Si7Cu2) along grain boundaries. The present paper describes the effects of mechanical working (extrusion, drawing and straightening) and artificial aging on intergranular corrosion in rods of the 6064 alloy. The resistance to intergranular corrosion was mapped using corrosion tests according to EN ISO 11846, method B. Corrosion tests showed dependence of corrosion type on mechanical processing of the material. Intergranular, pitting and transgranular corrosion was observed. Artificial ageing influenced mainly the depth of the corrosion.
机译：铝的Al-Mg-Si系合金类型（6XXX系列）表现出良好的机械性能，可成形性，可焊性和良好的耐腐蚀性在各种环境中。他们经常发现在汽车行业和其他应用程序。一些合金，然而，特别是那些具有较高的铜水平，显示出增加的晶间腐蚀敏感性。晶间腐蚀（IGC）通常与阴极，更稀有的相位和沿晶界耗尽（无沉淀）区之间microgalvanic细胞的形成。它主要遇到含有Cu，在那里它被认为是与沿晶界形成Q相析出物（Al4Mg8Si7Cu2）的AlMgSi合金。本文件描述了机械加工（挤压，拉伸和拉直），人造在6064合金的棒上的晶间腐蚀老化的影响。晶间腐蚀的阻力根据EN ISO 11846使用腐蚀试验映射，方法B.腐蚀测试表明该材料的机械加工的腐蚀类型的依赖。晶间，观察点蚀和穿腐蚀。人工老化影响了腐蚀的主要是深度。

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