在不同渗镀温度下对球墨铸铁进行了真空粉末渗锌工艺处理,利用金相显微镜、显微硬度计和划痕仪等分析方法对涂层形貌、厚度、显微硬度以及结合力等性能进行了表征。结果表明:渗锌涂层由Zn-Fe金属间化合物构成,在基体上呈连续致密均匀分布的条带状;渗锌温度在380~420℃范围内时,涂层的微观形貌变化不大,但涂层的表面质量、厚度、硬度以及结合力随温度的升高而发生改变。渗锌涂层的表面质量、厚度、硬度和结合力随着温度的升高而增大,但当温度超过410℃时,涂层内部却出现大量裂纹,降低涂层质量。

The process of vacuum powder zincification was carried out on nodular cast iron at different temperature.The coating morphology,thickness,microhardness and adhesion were characterized by means of metallographic microscope,microhardness tester and scratch tester.The results show that the zinc coating formed on the substrate is composed of Zn-Fe intermetallic compound,which is continuous,dense and uniform strip.When the sherardizing temperature range is 380~420℃,the micro morphology of the coating changes little,but the surface quality,thickness,hardness and adhesion of the coating change with the temperature increasing.The surface quality,thickness,hardness and bonding force of the zinc coating increase with the increase of temperature.But when the temperature exceeds 410℃,a large number of microcracks appear in the coating layer,which reduces the quality of the coating.