Abstract The effect of post-brazing heat treatment (PBHT) on the microstructure and electrochemical corrosion of AA4343/AA3xxx/AA4343-layered Al sheets were examined by analysing experimental results and using a work function calculation based on density functional theory (DFT). The PBHT at 325 °C results in the homogeneous dispersion of Cu in the re-solidified clad and eliminates the Al2Cu particles. Furthermore, after the PBHT, a large number of α-Al(Fe,Mn)Si particles were precipitated in the diffusion zone. This makes the diffusion zone slightly more anodic relative to the core layer and improves the capability of the diffusion zone to sacrificially protect the core layer.

中文翻译：

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钎焊后热处理对夹心多层铝板腐蚀机理的影响

摘要 通过分析实验结果和基于密度泛函理论(DFT) 的功函数计算，研究了钎焊后热处理(PBHT) 对AA4343/AA3xxx/AA4343 层状铝板微观结构和电化学腐蚀的影响。325 °C 下的 PBHT 导致 Cu 在重新凝固的包层中均匀分散，并消除了 Al2Cu 颗粒。此外，在 PBHT 后，大量 α-Al(Fe,Mn)Si 颗粒在扩散区析出。这使得扩散区相对于芯层稍微更阳极，并提高了扩散区牺牲性保护芯层的能力。