Research on Effect of Different Particle Size of Zinc Powder on the Properties of Thermal Diffusion Zinc Coating
Objective To study the effect of zinc powder particle size on the performance of thermal diffusion zinc coating in three different penetrating agents,namely SJ-01,SJ-02 and SJ-03.Methods Firstly,the crystal structure,microscopic morphology and elemental composition of the three types of penetrants,SJ-01,SJ-02 and SJ-03,were analysed by X-ray diffractometer,scanning electron microscope and energy spectrometer;Subsequently,the thickness,hardness,microscopic morphology,bonding force,and corrosion resistance of the infiltration layer formed by the three infiltrating agents were examined through thermal zinc infiltration experiments,in order to evaluate the influence of the particle size of the zinc powder in the infiltrating agents on the various indexes,and to screen out the optimal thermal zinc infiltrating agents.Results Compared with SJ-02 and SJ-03,the zinc powder in SJ-01 is smaller in particle size and uniformly distributed,which results in a more homogeneous,flat,and thicker penetration layer structure during the diffusion process of thermal zinc penetration,and thus obtains a more excellent microhardness(417.1 HV),bonding force of the substrate(24.07 MPa),and corrosion resistance.Conclusion The comprehensive performance of the thermal diffusion zinc coating prepared by SJ-01 penetrant with small particle size and uniform distribution of zinc powder is optimal.
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