Abstract
The corrosion behavior of a multi-layer modified aluminum brazing sheet (AA4045/3003Mod./AA7072/AA4045) was investigated. The results shows that, the existence of BDP, which forms at the interface between clad and core layer during brazing, changes the corrosion form of the air side of the material from inter-granular corrosion to local exfoliation corrosion. The addition of anti-corrosion layer makes the corrosion form of the water side from inter-granular corrosion into uniform exfoliation corrosion. Compared to the normal triple-layer brazing sheet at the same thickness, the time to perforation of the modified four-layer brazing sheet is increased by more than 200%.
Highlights
Aluminum alloys are of interest for various applications, due to their high strength/weight ratio, good formability and good corrosion resistance in vehicles, household items, infrastructures, constructions, aerospace, etc
This study aims to investigate the corrosion behavior of a self-developed four-layer modified Aluminum brazing sheet, and to be the theories storage for the new material development
The core material has a lower contrast, and some small particles exist with different chemical composition
Summary
Aluminum alloys are of interest for various applications, due to their high strength/weight ratio, good formability and good corrosion resistance in vehicles, household items, infrastructures, constructions, aerospace, etc. While a subsequent study[4,5] shown that Si particles do not have a detrimental effect on the corrosion behavior of the brazing sheets. It is coincident with the study of Tohma et al.[6,7] that the oxygen reduction current density on silicon is too low to anodically polarize aluminum. A investigation of the modified AA3xxx aluminum brazed sheet shown that the diffusion of Cu element to the re-solidified clad material during brazing will reduce the cathodic protection towards the core material[10]. It is said that the existence of BDP will affect the corrosion behavior of the brazed material[13], there is no definitive mechanism about the effect above
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