(1. 南京农业大学 工学院，南京 210031；
2. 南京农业大学 江苏省智能化农业装备重点试验室，南京 210031)
摘 要: 采用电沉积法在45钢表面制得Ni-Co-P-BN(h)、Ni-Co-P-Al2O3及Ni-Co-P-BN(h)-Al2O3纳米复合镀层。利用SEM、EDS、XRD对镀层的组织、成分及相结构进行了表征和分析，并利用激光共聚焦显微镜、光学接触角测量仪和电化学工作站分别对镀层的表面粗糙度、润湿性及防腐性能进行研究。结果表明：二元纳米颗粒掺杂配比对Ni-Co-P-BN(h)-Al2O3镀层的表面形貌、表面粗糙度及厚度均有影响。与Ni-Co-P-BN(h)和Ni-Co-P-Al2O3镀层相比，在水滴体积为3 μL、速度为1 μL/s条件下，Ni-Co-P-BN(h)-Al2O3镀层表面静态接触角为133°，镀层表面具有更高的疏水角。电化学试验表明：在5%的NaCl溶液中，Ni-Co-P-BN(h)-Al2O3镀层的最小腐蚀电流密度和腐蚀速率分别为1.0806×10-6 A/cm2和0.01308 mm/a，镀层具有更优的耐蚀性。镀层中共沉积的纳米BN(h)、Al2O3颗粒充分发挥二元纳米粒子的优势，进一步提高了二元纳米复合镀层表面的疏水性和耐蚀性。
关键字: 电沉积；Ni-Co-P-BN(h)-Al2O3二元纳米复合镀层；表面粗糙度；润湿性；耐蚀性
（1. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China;
2. Key Laboratory of Intelligence Agricultural Equipment of Jiangsu Province, Nanjing Agricultural University, Nanjing 210031, China）
Abstract:Ni-Co-P-BN(h), Ni-Co-P-Al2O3 and Ni-Co-P-BN(h)-Al2O3 nanocomposite coatings were fabricated on the 45 steels substrate by electrodeposition. The organization, composition and phase structure of the coating were characterized and analyzed by SEM, EDS and XRD, respectively. And the surface roughness, wettability and corrosion resistance properties of the coatings were studied by laser scanning confocal microscope, optical contact angle measuring instrument and electrochemical workstation, respectively. The results show that the surface morphology, surface roughness and thickness of the Ni-Co-P-BN(h)-Al2O3 coatings are affected by the doping proportioning of binary nanoparticles. Compared with Ni-Co-P-BN(h) and Ni-Co-P-Al2O3 coatings, the static contact angle of the Ni-Co-P-BN(h)-Al2O3 coatings is 133° and the hydrophobic angle of the Ni-Co-P-BN(h)-Al2O3 coatings is higher when the droplet volume is 3 μL and the velocity is 1 μL/s. The electrochemical test results show that the corrosion current density of the Ni-Co-P-BN(h)-Al2O3 binary nanocomposite coatings is 1.0806×10-6 A/cm2 and the corrosion rate is 0.01308 mm/a when immersed in 5% (mass fraction) NaCl solution, which indicates that the Ni-Co-P-BN(h)-Al2O3 coatings has better corrosion resistance. The nano particles BN (h) and Al2O3 deposited in the coatings have fully utilized advantages of binary nanoparticles. The hydrophobicity and corrosion resistance of the binary nanocomposite coatings have been further improved.
Key words: electrodeposition; Ni-Co-P-BN(h)-Al2O3 binary nanocomposite coatings; surface roughness; wettability properties; corrosion resistance
