  Second Generation advanced high strength steel is the material of choice for
modern automotive structural parts because of its outstanding maximal
elongation and tensile strength. Nonetheless there is still a lack of corrosion
protection for this material due to the fact that cost efficient hot dip
galvanizing can not be applied. The reason for the insufficient coatability
with zinc is found in the segregation of manganese to the surface during
annealing and the formation of manganese oxides prior coating. This work
analyses the structure and chemical composition of the surface oxides on so
called nano-TWIP (twinning induced plasticity) steel on the nanoscopic scale
after hot dip galvanizing in a simulator with employed analytical methods
comprising scanning Auger electron spectroscopy (SAES), energy dispersive x-ray
spectroscopy (EDX), and focused ion beam (FIB) for cross section preparation.
By the combination of these methods it was possible to obtain detailed chemical
images serving a better understanding which processes exactly occur on the
surface of this novel kind of steel and how to promote in the future for this
material system galvanic protection.
