A full microstructural characterization of a modified AA4xxx/AA3xxx brazing sheet was obtained. The electrochemical nature and activity of the overall microstructure and microstructural heterogeneities were identified.
Accumulation of alloying elements on the surface, localized corrosion susceptibility of the re-solidified clad material, and the increase in the Volta potential of the clad matrix which in turn reduces the cathodic protection power of the re-solidified clad towards the core, were found to be the major changes that occurred during the brazing process.
The detailed understanding of the evolved electrochemical properties aims to develop strategies to enhance corrosion resistance by controlling the microstructure.
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