Corrosion Resistance of Zn-Al-Mg Coated Steel Sheet Cut-Edge
The Zn-Al-Mg coated steel plates with different thicknesses were processed into circular samples with different inner and outer diameters by laser cutting to obtain different ratios of cut-edge area to coating area.The corrosion resistance and corrosion products were observed and analyzed by neutral salt spray test,scanning electron microscopy(SEM)and X-ray diffraction(XRD).The microstructure characteristics,phase composition and corrosion resistance of the Zn-Al-Mg coating notch were determined.The results showed that the corrosion products of the steel plate were mainly basic zinc carbonate[Zn4CO3(OH)6·H2O]in neutral salt spray environment.With the increase of the ratio of cut-edge area to coating area,the red rust area of the sample cut-edge increased gradually,and when the ratio of cut-edge area to coating area was less than 0.5,the red rust resistance of the cut-edge was better.
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