Interface reaction mechanism of electroless Ni-P flash-coated steel dippedinto a Zn-5 % Al bath

Phenomena related to an alternate means of preparing steel for discontinuou s hot dip galvanizing using aluminum-containing galvanizing baths are prese nted in this paper, using electroless deposition of thin layers of NI-P as a steel pretreatment before immersion in molten Zn-5 % Al alloy. By this me ans, the use of fluxes is eliminated. The greater chemical affinity of Ni t o Al, compared with Fe and Zn, allows for control of the role of Al in the galvanizing reaction.