Abstract A combination of glow discharge optical emission spectroscopy sputtering and local electrochemical measurements was used to determine electrochemical changes upon brazing in a multi-layered Aluminium sheet (AA4343/AA3xxx/AA4343) with an additional low-Cu (AA3xxx) interlayer. E corr values from potentiodynamic polarization, galvanic corrosion behaviour by ZRA, microstructure and composition by SEM and TEM were investigated and compared to those obtained for sheet without the interlayer. Inward diffusion of Si from clad, and outward diffusion of Cu from core are found to degrade the corrosion properties of conventional sheet, whereas presence of interlayer reduced outward diffusion of Cu and hence improved corrosion protection.

中文翻译：

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用于汽车热交换器的多层铝板的电化学分析

摘要 辉光放电发射光谱溅射和局部电化学测量相结合，用于确定在具有额外低铜 (AA3xxx) 夹层的多层铝板 (AA4343/AA3xxx/AA4343) 中钎焊时的电化学变化。研究了动电位极化的 E corr 值、ZRA 的电偶腐蚀行为、SEM 和 TEM 的微观结构和成分，并与没有夹层的板材获得的值进行了比较。研究发现，Si 从包层向内扩散，Cu 从芯部向外扩散会降低传统板材的腐蚀性能，而夹层的存在减少了 Cu 的向外扩散，从而改善了腐蚀保护。