中文摘要：

将表面电镀纳米Ni-W合金镀层的p110SS油管钢在不同温度和保温时间下进行热处理,通过X射线衍射分析（XRD）、能谱分析（EDS）、电化学试验、显微硬度计、金相显微镜等方式研究不同温度和保温时间的热处理对纳米Ni-W合金镀层性能的影响。结果表明,Ni-W合金镀层的主要成分为Ni_（17）W_3,镀层的平均晶粒尺寸为5.8 nm。随着热处理温度的升高,镀层的硬度先升高后降低,达到500℃时镀层的显微硬度达到最大值1196 HV0.1;镀层的腐蚀速率先减少后增大,500℃时腐蚀速率达到最低的0.1258 mm/a。镀层的硬度随着保温时间的增加逐渐减少,腐蚀速率随着保温时间的增加逐渐增加,保温1 h镀层的硬度最高,耐腐蚀性最好。经过热处理后的镀层与基体结合良好,均达到一级标准。纳米Ni-W合金镀层的最优热处理工艺为500℃保温1 h。

英文摘要：

P110SS steel with nanostructured Ni-W coating was heat treated at different temperature and different soaking time. The coating performance was tested through X-ray diffraction（ XRD）, spectroscopy（ EDS）,electrochemical experiments, micro-hardness tester,microscope,etc. The results show that the main components of Ni-W alloy coating is Ni_（17）W_3,the average grain size of the coating is 5. 8 nm.With the increase of heat treatment temperature,The hardness increases at first and then decreases,microhardness reaches a maximum 1196 HV0. 1 at 500 ℃; the corrosion resistance performance of the coating first decreases and then increases,and the corrosion rate reached the lowest 0. 1258 mm / a at 500 ℃. The coating hardness gradually reduces with the increase of soaking time,and reaches the maximum hardness when the soaking time is 1 h. Coating corrosion rate increases gradually with the increase of soaking time,corrosion resistance is best also when the soaking time is 1 h. The heat treated coatings have the good binding force with the substrate and all reach the standard requirements. Therefore the optimum heat treatment process of nanostructured Ni-W coating is at 500 ℃ for 1 h.