摘要
提高结晶器铜板表面的抗摩擦磨损性能和耐腐蚀性能,对连铸结晶器的研发与改进具有重要的研究意义与研究价值。本研究在氨基磺酸盐体系中加入平均粒径为20 nm的纳米Al_(2)O_(3)颗粒制成镀液,超声辅助下在Cu-Cr-Zr合金基体表面电镀Ni-Co/Al 2O3纳米复合镀层,并通过摩擦磨损、高温氧化、显微硬度、结合力、耐腐蚀等测试对复合镀层进行性能表征。结果表明:最优工艺参数为电流密度5 A/dm^(2)、镀液温度50℃、纳米Al_(2)O_(3)浓度10 g/L、施镀时间1.00 h、超声功率200 W,机械搅拌500 r/min;此工艺下Ni-Co/Al_(2)O_(3)纳米复合镀层表面显微硬度最高,组织排列最细小紧密,且纳米粒子分散均匀嵌入在基质金属中,无明显的团聚现象产生,微观形貌达到最优;超声辅助下所制备的Ni-Co/Al_(2)O_(3)纳米复合镀层在400℃下具有优良的抗高温氧化能力;与Cu-Cr-Zr合金、Ni-Co合金镀层相比,Ni-Co/Al_(2)O_(3)纳米复合镀层具有最优的抗摩擦磨损性能和耐腐蚀性能。
Enhancing the anti-friction and anti-wear and corrosion resistant properties of mold copper plates holds significant research significance and value for the development and improvement of continuous casting molds.In this study,a Ni-Co/Al_(2)O_(3) nanocomposite coating was electrodeposited on the surface of a Cu-Cr-Zr alloy substrate with the assistance of ultrasonic during the electroplating process,and the plating bath was formulated by incorporating nano-Al_(2)O_(3) particles with an average diameter of 20 nm into a sulfamate-based electrolyte system.Subsequently,the composite coating was systematically characterized through friction and wear testing,high-temperature oxidation evaluation,microhardness measurement,adhesion assessment,and corrosion resistance analysis.Results showed that the optimal process parameters were current density of 5 A/dm^(2),bath temperature of 50℃,nano-Al_(2)O_(3) concentration of 10 g/L,deposition time of 1.00 h,ultrasonic power of 200 W,and mechanical stirring at 500 r/min.Under this process,the Ni-Co/Al_(2)O_(3) nanocomposite coating exhibited the highest surface micro-hardness,the finest and most compact structure arrangement,the uniformly dispersed nanoparticles embedded in the metal matrix without obvi-ous agglomeration,and the optimal microscopic morphology.Moreover,the Ni-Co/Al_(2)O_(3) nanocomposite coating prepared with ultrasonic assis-tance had excellent high-temperature oxidation resistance at 400℃;Compared with Cu-Cr-Zr alloy and Ni-Co alloy coatings,Ni-Co/Al_(2)O_(3) nanocomposite coating possessed the best anti-friction and anti-wear performance and corrosion resistance.
作者
王宏宇
王一雍
王露彬
梁智鹏
WANG Hongyu;WANG Yiyong;WANG Lubin;LIANG Zhipeng(School of Materials and Metallurgy,Liaoning University of Science and Technology,Anshan 114051,China)
出处
《材料保护》
2025年第4期78-89,共12页
Materials Protection
基金
国家自然科学基金项目(U23A20610)。
