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渗硼层硬度高，能改善球墨铸铁（以下简称球铁）的摩擦学性能，而等温淬火能提高基体的力学性能。对含Cu、Cu-Ni和Cu-Ni-Mo的合金球铁试样进行了盐浴（硼砂＋铝）渗硼，渗硼温度分别为850℃、900℃和950℃，时间2 h和4 h。通过所获得的渗层数据确定合金球铁渗硼的扩散系数和激活能。计算求得的扩散系数与通过直接测定渗层厚度得出的扩散系数相接近。含Cu或Cu-Ni的试样激活能为141．27 kJ／mol，而含Cu-Ni-Mo的试样激活能为212．98 kJ／mol。统计参数与相关系数（R）吻合良好。“,”Boriding thermochemical treatment produces layers with high hardness which improves the tribological performance of ductile cast iron while the austempering treatment improves the mechanical performance of the substrate.In this work,samples of the ductile cast iron alloyed with copper,copper-nickel and copper-nickel-molybdenum were borided in a salt bath (borax +aluminum)at temperatures of 850,900 and 950 ℃ during 2 and 4 hours.The data for the layers obtained were used to determine the diffusion coefficients and activation energies of this process.The results of the calculated diffusion coefficients were similar to those obtained by the direct measurements of the layer thicknesses.For the sample alloyed with Cu or Cu-Ni the activation energy obtained was 141.27 kJ/mol,and for the sample alloyed with Cu-Ni-Mo the value was 212.98 kJ/mol.The statistical parameters and the correlation coefficients (R)showed satisfactory agreement.