【摘 要】
：
To improve the low thermal conductivities and poor wear resistances of TC4 (Ti-6Al-4V) alloy, the most widely used titanium alloy, the surface of TC4 alloys is modified by electroplating deposition of Ni and Cu layers, and then heat-treated to increase th
【机 构】
：
School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China;CNPC Tubular G
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
To improve the low thermal conductivities and poor wear resistances of TC4 (Ti-6Al-4V) alloy, the most widely used titanium alloy, the surface of TC4 alloys is modified by electroplating deposition of Ni and Cu layers, and then heat-treated to increase the diffusivity at the interface. In this paper, the corrosion behavior of Cu/Ni coatings on TC4 alloy at different heat treatment processes was investigated in 3.5 wt% NaCl by the electrochemical analysis, and the microstructure and composition of corrosion products was carried out to reveal the corrosion resistance mechanism of Cu/Ni coatings. It was found that the corrosion resistance was significantly influenced by heat treatment temperature. With the increasing diffusion treatment temperature from 500 to 700 ℃, the corrosion potential positively shifted from -330.87 to -201.14 mV, and the corrosion current density decreased from 4.02×10-3 to 0.514×10-3 mA/cm2. However, when heat treatment temperature increased to 800 ℃, the corrosion potential negatively shifted to -207.21 mV, and the current density increased to 1.62×10-3 mA/cm2.The diffusion behavior of Ti, Ni and Cu elements occurred and small amounts of Ni and Ti elements appeared on the specimen surface under different heat treatment temperature. Especially heat-treated at 700 ℃, the smaller pore size, dense Cu2O film, and highly stable TiO and NiO oxide layer were formed, which dramatically enhanced the corrosion resistance of Cu/Ni coatings. Finally, a novel model of corrosion resistance was proposed based on the analysis mentioned above.
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