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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。
The p110SS tubing steel with nano-Ni-W plating on the surface was heat-treated at different temperatures and holding time. The X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), electrochemical test, microhardness tester, Microscope and other ways to study the different temperature and holding time of the heat treatment of nano-Ni-W alloy coating performance. The results show that the main component of Ni-W alloy coating is Ni_ (17) W_3, and the average grain size of coating is 5.8 nm. With the increase of heat treatment temperature, the hardness of the coating first increases and then decreases. When the temperature reaches 500 ℃, the microhardness of the coating reaches 1196 HV0.1. The corrosion rate of the coating first decreases and then increases, and the corrosion rate reaches 500 ℃ The lowest 0.1258 mm / a. The hardness of the coating gradually decreases with the increase of holding time, and the corrosion rate increases with the increase of holding time. The hardness of the coating is the highest at 1 h and the corrosion resistance is the best. After heat treatment, the coating is well bonded with the substrate, all of which reach the first grade standard. The optimal heat treatment process for nano-Ni-W alloy coating is 500 ℃ for 1 h.