TY - CONF

T1 - AFM and KPFM investigation of high strength aluminium brazing sheets

AU - Huszar, Michael

AU - Kremmer, Thomas

AU - Kratzer, Markus

AU - Oberhauser, Paul

AU - Antrekowitsch, Helmut

AU - Teichert, Christian

PY - 2015

Y1 - 2015

N2 - High strength aluminum brazing compounds used in car-cooler systems become susceptible to corrosion after brazing. An intermediate layer has to be inserted to separate the 4xxx filler-material from the 7xxx base-material. The effectivity of this layer in preventing corrosion was investigated using atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). Samples were subjected to a simulated brazing cycle and exposed to a corrosive medium. The investigations revealed the presence of cathodic inclusions in the Al-matrix. Further, a line of up to 3 µm wide holes is formed at the transition between intermediate layer and base material.

AB - High strength aluminum brazing compounds used in car-cooler systems become susceptible to corrosion after brazing. An intermediate layer has to be inserted to separate the 4xxx filler-material from the 7xxx base-material. The effectivity of this layer in preventing corrosion was investigated using atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). Samples were subjected to a simulated brazing cycle and exposed to a corrosive medium. The investigations revealed the presence of cathodic inclusions in the Al-matrix. Further, a line of up to 3 µm wide holes is formed at the transition between intermediate layer and base material.

KW - scanning probe microscopy

KW - kelvin probe force microscopy

KW - aluminium

KW - brazing sheet

KW - corrosion

KW - material science

M3 - Poster

T2 - ÖPG Jahrestagung 2015

Y2 - 1 September 2015 through 4 September 2015

ER -