Abstract
Electron backscatter diffraction was employed to identify the phase evolution of a 55 wt.% Al-Zn coated steel after the austenitization heat treatment at 900℃ for 5min. The results show that the Fe2Al5 and FeAl phases were the major phase in the coating. The Fe2Al5 formed in the middle, but the FeAl phase formed on the outer part the diffusion layer or beneath the Fe2Al5 phase. Moreover, the Zn hardly dissolved in the FeAl phase, but precipitated as a pure Zn phase or gathered on the top of the diffusion layer to form oxide layer. The result of pole figure indicated that the orientation of the FeAl phase was random; however, the Fe2Al5 phase had texture. Finally, the electrochemical stripping results showed that the potential of the diffusion layer was more active than the steel substrates and the potential gap was found to be approximately 500 mV.
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