This paper studied the effect of embossing on the microstructure and corrosion behaviour of an Al−1.1 wt% Mn sheet. The microstructure of the embossed Al−1.1 wt% Mn sheets was studied by differential interference contrast microscopy, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, focused ion beam microscopy and X-ray computational tomography. Finite element modelling was used to assess the stress and strain distribution developed during embossing, and to support the experimental analyses. The corrosion behaviour of the embossed sheets was assessed using potentiodynamic anodic polarisation tests, followed by corrosion surface morphology analysis. Results showed a microstructural evolution of the alloy during embossing, which is dependent on both the embossed pattern geometry and the roll forming direction. Nonsymmetrical displacement of material, in respect to the pattern geometry, was caused by the anisotropic forming pressure applied on the strip during roll forming, which yielded the formation of more susceptible sites for pitting and intergranular corrosion on the embossed aluminium surfaces.

中文翻译：

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用于热交换器管的人字形凹槽压纹 Al–1.1 wt% Mn 条带的微观结构相关腐蚀

本文研究了压纹对 Al-1.1 wt% Mn 板的微观结构和腐蚀行为的影响。通过微分干涉对比显微镜、扫描电子显微镜、透射电子显微镜、能量色散 X 射线光谱、聚焦离子束显微镜和 X 射线计算断层扫描研究压印的 Al-1.1 wt% Mn 片的微观结构。有限元建模用于评估压印过程中产生的应力和应变分布，并支持实验分析。使用动电位阳极极化测试评估压花板的腐蚀行为，然后进行腐蚀表面形态分析。结果显示在压花过程中合金的显微组织演变，这取决于压花图案几何形状和滚压成型方向。材料相对于图案几何形状的非对称位移是由辊轧成形过程中施加在带材上的各向异性成形压力引起的，这导致在压花铝表面上形成更易发生点蚀和晶间腐蚀的部位。