目的 通过添加不同量的Sb元素降低锌液表面张力，提升X80管线钢热浸镀锌可镀性及镀层质量。方法 采用改良座滴法在450 ℃下进行润湿实验，利用轴对称液滴分析软件（ADSA），计算不同Zn-Sb合金熔体在X80钢基板上的接触角，得到450 ℃时Zn-Sb合金熔体表面张力。通过能谱仪和扫描电子显微镜对镀层表面及截面的微观形貌和组织结构进行分析。结果 当Sb添加量为1.0%时，450 ℃下Zn-Sb合金表面张力约为0.63 N/m，随Sb含量的增加，表面张力逐渐减小，当Sb含量增加到4.0%时，表面张力达到0.46 N/m，远低于纯锌液的0.79 N/m。同时，Zn-Sb合金熔体与X80钢的接触角也从最初的57°逐渐减小到43°。锌合金熔体与X80钢界面处形成铁锌化合物组成的连续反应层，且在反应三相线外存在前驱膜，前驱膜的形成使随后的合金液在其上铺展，促进了润湿。结论 Sb的添加能有效降低锌液表面张力，减小Zn-Sb合金熔体与X80钢间的接触角。Sb的表面张力较小，倾向于在锌合金表面富集，其作为表面活性元素降低锌液表面张力，从而提高润湿性。

The work aims to reduce the surface tension of zinc solution by adding different amounts of Sb element, and to improve the galvanizability and coating quality of X80 pipeline steel. The wettability test was carried out at 450 ℃ by improved sessile-drop method. The contact angle of different Zn-Sb alloy melts on X80 steel substrate was calculated by using Axisymmetric Drop Shape Analysis software (ADSA), the surface tension of the Zn-Sb alloy melt at 450 ℃ was obtained. The results show, when Sb content is 1.0wt.%, the surface tension of Zn-Sb alloy at 450 ℃ is about 0.63 N/m. The surface tension decreases gradually with the increase of Sb content. When Sb content increases to 4.0wt.%, the surface tension reaches 0.46 N/m, which is much lower than that of pure zinc melt. At the same time, the contact angle between Zn-Sb alloy melt and X80 steel gradually decreases from 57° to 43°. A continuous reaction layer composed of iron-zinc compound is formed at the interface between the zinc alloy melt and the X80 steel, and a precursor film exists outside the reaction three-phase line, and the formation of the precursor film causes the subsequent alloy liquid spread on it and promotes wetting. The addition of Sb can effectively reduce the surface tension of zinc liquid and reduce the contact angle between Zn-Sb alloy melt and X80 steel. The surface tension of Sb is low and tends to be concentrated on the surface of zinc alloy. As a surface active element, Sb can reduce the surface tension of zinc liquid and improve wettability.