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Hot-dip Zn-Ti galvanizing can restrain the excess growth of the coating which has better corrosion resistances than hot-dip pure Zn.The change rules ofΓ2intermetallic compound in hot-dip Zn-Ti galvanizing is investigated by immersion time,titanium content and the slag test using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).And the mechanism of nucleation and growth ofΓ2intermetallic compound is analysed.The results show that,when adding 0.05mass%titanium to the zinc bath,theΓ2particles form in theηlayer,which nucleate by obtaining Ti atoms from theηphase and Fe atoms from the dissolvingζphase layer.Moreover,the more titanium is added into the bath,the more and biggerΓ2 particles appear.TheГ2particles in the coatings grow up noticeably with prolonging the immersion time.
Hot-dip Zn-Ti galvanizing can restrain the excess growth of the coating which has better corrosion resistance than hot-dip pure Zn. The change rules of Γ2intermetallic compound in hot-dip Zn-Ti galvanizing is investigated by immersion time, titanium content and the slag test using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). And the mechanism of nucleation and growth of Γ2 intermetallic compound is analyzed. The results show that, when adding 0.05 mass% titanium to the zinc bath, the Γ2particles form in theηlayer, which nucleate by obtaining Ti atoms from theηphase and Fe atoms from the dissolvingζphase layer. Moreover, the more titanium is added into the bath, the more and biggerΓ2articles appear.TheΓ2particles in the coatings grow up noticeably with prolonging the immersion time