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本文采用金相观察、能谱分析、Ｘ射线衍射分析等手段，着重研究了在中碳钢衬底上施镀的Ｎｉ－Ｐ－金刚石复合镀层经中、低温热处理后，镀层与衬底间的扩散问题．结果表明，镀件经 ２００—８００℃ ，各 １ｈ的热处理后，镀层与衬底间发生 Ｆｅ、Ｎｉ元素的相互扩散，Ｆｅ元素在镀态时即有扩散现象，而Ｐ的扩散很弱．经６００℃，１ｈ热处理后，由于扩散的影响，镀层内Ｎｉ元素呈梯度分布；镀件经８００℃，１ｈ热处理后并空冷，扩散层中主要形成了γ（Ｎｉ，Ｆｅ）相．
In this paper, metallographic observation, energy spectrum analysis, X-ray diffraction analysis and other means, focused on the carbon steel substrate plated Ni-P-diamond composite coating by medium and low temperature heat treatment, the coating and the substrate Diffusion issues. The results show that the mutual diffusion of Fe and Ni elements occurs between the coating and the substrate after the heat treatment at 200-800 ℃ for 1h, the diffusion of Fe element during the plating state and the weak diffusion of P. After heat treatment at 600 ℃ for 1h, the Ni element in the coating showed a gradient distribution due to the effect of diffusion. After heat treatment at 800 ℃ for 1h and air cooling, the γ (Ni, Fe) phase mainly formed in the diffusion layer.