(北京科技大學 新材料技術研究院 腐蝕與防護中心，北京100083)
摘 要: 在正交實驗基礎上，對比研究微米SiC(平均粒徑1.5 μm)和納米SiC(平均粒徑20 nm)增強復合鎳基鍍層的摩擦磨損行為和耐腐蝕性能。通過TEM、SEM、EDX和XRD等手段研究顆粒分散狀態(tài)以及復合鍍層的表面和截面形貌、成分及相結構。采用球−盤滑動摩擦磨損試驗機研究復合鍍層的耐磨性。電化學阻抗譜測量在3.5%的NaCl水溶液中進行。結果表明：微米級顆粒增強復合鍍層可以獲得更高的表面硬度，兩種增強復合鍍層具有相似的摩擦磨損行為。電化學阻抗譜分析表明：SiC顆粒的加入可以提高鍍層的耐腐蝕性，且納米顆粒復合鍍層具有更好的耐蝕性。
關鍵字: 復合鍍層；鎳；SiC顆粒；耐磨耐蝕性能
（Corrosion and Protection Center, Institute of Advanced Materials,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Ni-SiC composite coatings were prepared by the co-electrodeposion of Ni matrix with micron and nano-sized SiC particles (1.5 μm and 20 nm), respectively. The microstructure, hardness, tribological properties and corrosion behaviours of the composite coating on medium carbon steels were investigated. The results indicate that the incorporation of SiC particles in metallic matrix significantly improves the hardness and wear resistance of deposited layer. Moreover, the hardness of the composite coatings is much more improved by the micron-particles than by the nano-sized ones, while there is almost no difference for wear and abrasion resistance between these two sized particles reinforced composite coatings. The corrosion behavior of the composite coatings was evaluated by the electrochemical impedance spectroscopy in 3.5% NaCl solution at room temperature. It is observed that the composite coatings incorporated with SiC particles provide higher corrosion resistance than the pure Ni coating, moreover, the incorporation of the nano SiC particles significantly improves the corrosion resistance than that of the micron-sized ones. The mechanism of improvement of wear resistance and corrosion resistance for the composite coatings was also discussed.
Key words: electrodeposited composite coating; nickel; SiC particle; wear and corrosion resistance
