论文部分内容阅读
为了改善钛合金的耐磨性及抗微动损伤能力，对Ｔｉ６Ａｌ４Ｖ合金的化学镀ＮｉＰ工艺进行了研究，发现应用一种由化学除油→化学浸蚀→表面活化→化学镀ＮｉＰ的新工艺路线，可获得高质量的ＮｉＰ镀层。通过扫描电镜、Ｘ射线衍射及硬度测量，对镀层在稳定化处理过程中的显微组织及硬化效应进行了测定与分析。试验结果表明，ＮｉＰ镀层在３００℃～６００℃范围内的稳定化过程中逐渐晶化，而由原先的非晶态转化为晶态ＮｉＰ层。经过适当的稳定化处理可明显提高镀层硬度，并在ＮｉＰ镀层与基体金属间形成一个过渡带，有利于改善ＮｉＰ镀层的性能和附着力。镀层的硬度可根据需要，通过改变稳定化参数而加以控制。
In order to improve the wear resistance of titanium alloy and anti-fretting damage, the electroless NiP process of Ti6Al4V alloy was studied and found that a new process route from chemical degreasing → chemical etching → surface activation → electroless NiP , Get high quality NiP coating. The microstructure and the hardening effect of the coating during the stabilization process were measured and analyzed by scanning electron microscopy, X-ray diffraction and hardness measurement. The experimental results show that the NiP coating gradually crystallizes during the stabilization from 300 ℃ to 600 ℃ and from the original amorphous to the crystalline NiP layer. Proper stabilization can obviously improve the hardness of the coating and form a transition zone between the NiP coating and the base metal, which is beneficial to improve the performance and adhesion of the NiP coating. The hardness of the coating can be controlled as needed by changing the stabilization parameters.