中文摘要：

采用原子吸收光谱（AAS）标准曲线法对YG系列硬质合金刀具酸蚀后浸蚀溶液中的Co浓度进行了定量测试；采用洛氏硬度（HRC）计跟踪测试了不同酸蚀时间后刀具硬度的变化；采用扫描电子显微镜（SEM）观察了硬质合金刀具酸蚀前后的组织变化及金刚石薄膜的组织形貌。结果表明：YG类硬质合金刀具基底含Co量越高，基底晶粒越粗大，酸蚀速度越快，酸对基底组织刻蚀能力越强；随着酸蚀时间的延长，硬质合金刀具硬度不断降低，YG6、YG6X、YG8刀具分别在刻蚀300秒、420秒、180秒后出现刀具硬度急剧下降。镀膜结果显示，YG6、YG6X刀具最佳酸蚀预处理时间分别为300秒和420秒；对于YG8刀具，只有增加酸蚀时间以消除或减弱Co的不利影响，但这将导致刀具机械性能显著下降。

英文摘要：

The Co concentration in the etching liquor after different acid corroding time for YG series cemented carbide tools was tested by atomic absorption spectrometry, the hardness change of tools was detected by HRC and the microstructure of diamond film was observed by scanning electron microscope. The results show that the crystal size and Co concentration of carbide tools significantly impact on its acid corroding speed. Hardness of carbide tools became lower when corroding going on. Diamond film deposited on different substrates show that the best etching time is 300s for YG6 and 420s for YG6X. The etching time must be prolonged to get off the effect of Co for YG8, but it will lower mechanical properties of the carbide tool.