Atmospheric corrosion behavior of 7A09 aluminum alloy exposed to an industrial environment,Materials and Corrosion

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Atmospheric corrosion behavior of 7A09 aluminum alloy exposed to an industrial environment
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-09-29 , DOI: 10.1002/maco.202012067
Ling Wang ₁ , Bin Wang ₂ , Laizheng Luo ₁ , Hua Jiang ₂ , Jie Liu ₃

Affiliation

The corrosion behavior of 7A09 alloys exposed to an industrial atmosphere for 36 months was studied by weight loss method, morphology observation, electrochemical method, and loss in mechanical properties. Under the condition of exposure to an industrial atmosphere, the 7A09 alloy suffers obvious pitting corrosion and intergranular corrosion (IGC), and a charge transfer process controls the corrosion reaction. The corrosion rate presents a decreasing tendency with exposure time, which is mainly due to the enhancement of the protective ability of the corrosion product layer. The occurrence of IGC of this alloy is mainly caused by the preferential dissolution of the grain boundary precipitates Mg(ZnAlCu)₂ and the precipitate‐free zone along grain boundaries, and which leads to the reduction of the mechanical properties. In addition, the morphology and composition of the corrosion product layer were identified, and the corrosion mechanism was also discussed.

中文翻译：

暴露于工业环境中的7A09铝合金的大气腐蚀行为

通过失重法，形态观察，电化学法和力学性能损失，研究了暴露于工业环境下36个月的7A09合金的腐蚀行为。在暴露于工业气氛的条件下，7A09合金会遭受明显的点蚀和晶间腐蚀（IGC），并且电荷转移过程控制着腐蚀反应。腐蚀速率随暴露时间呈现下降趋势，这主要归因于腐蚀产物层保护能力的增强。该合金IGC的产生主要是由于晶界析出物Mg（ZnAlCu）₂的优先溶解所致。沿晶界的无沉淀区，导致机械性能下降。此外，确定了腐蚀产物层的形貌和组成，并讨论了腐蚀机理。

更新日期：2020-12-01

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