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从锌液本身的物理性能着手,通过引进焦利秤测量微小力的原理,利用吊片法测定热浸镀锌中锌液及其合金在420～480℃的表面张力,确定微量铝的加入,使由锌铝组成的理想稀溶液的自由能降低,引起锌液的表面张力下降,进而使锌液的化学位降低。并通过电化学实验测定了纯Zn及Zn-0.2%Al的极化曲线,证实了由表面张力降低所引起的锌液化学位的降低对提高镀锌层的耐腐蚀性能起很大的作用。
Starting from the physical properties of zinc solution itself, the principle of measuring tiny force by introducing Joli scale was measured, and the surface tension of zinc solution and its alloy in hot-dip galvanized zinc was measured by hanging sheet method at 420-480 ℃ to determine the addition of trace aluminum. The free energy of the ideal dilute solution composed of zinc and aluminum is reduced, causing the surface tension of the zinc solution to drop, thereby reducing the chemical potential of the zinc solution. The polarization curves of pure Zn and Zn-0.2% Al were measured by electrochemical experiments. It was confirmed that the reduction of zinc hydration potential caused by the decrease of surface tension played a very important role in improving the corrosion resistance of zinc coating.