(江蘇大學(xué) 先進制造與現(xiàn)代裝備技術(shù)工程研究院，鎮(zhèn)江 212013)
摘 要: 采用硬度測試、金相觀察、掃描電鏡、能譜分析及腐蝕和摩擦實驗的方法，研究鈧、鋯和鍶對鑄態(tài)鎳鋁青銅的硬度、組織、耐腐蝕性能和摩擦磨損性能的影響。結(jié)果表明：與未微合金化鑄態(tài)鎳鋁青銅(Cu-8.57Al- 5.3Fe-4.6Ni-1.07Mn-0.63Zn)相比，鈧、鋯和鍶復(fù)合微合金化鑄態(tài)鎳鋁青銅(Cu-9.97Al-5.4Fe-4.52Ni-1.05Mn-0.62Zn- 0.045Zr-0.029Sr-0.057Sc)的相組成沒有顯著變化，都由α相、β相(高溫相)和κ相組成，且各相均顯著細化，合金硬度從212.1HV提高到240.7HV；由于組織細化，合金內(nèi)優(yōu)先發(fā)生腐蝕的共析組織(α+κIII相)，其腐蝕通道產(chǎn)生概率降低，從而在3.5%NaCl水溶液中的均勻腐蝕和電化學(xué)腐蝕速率分別降低了.2%和17.8%(微合金化后的腐蝕速率分別為0.023 mm/a和0.231 mm/a)；摩擦因數(shù)降低了23.4%(微合金化后的摩擦因數(shù)為0.019 3)。
關(guān)鍵字: 鎳鋁青銅；微合金化；顯微組織；耐腐蝕性能；摩擦磨損性能
（Engineering Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University,
Zhenjiang 212013, China）
Abstract:The effects of scandium, zirconium and strontium on the hardness, microstructures, corrosion resistance and friction-wear properties of nickel-aluminium bronze ingot were investigated by means of hardness measurement, optical microscopy (OM), scanning electron microscopy (SEM), energy spectrum analysis and corrosion and friction experiments. The results show that, compared with the un-micro-alloying nickel-aluminium bronze ingot (Cu-8.57Al- 5.3Fe-4.6Ni-1.07Mn-0.63Zn), the micro-alloying nickel-aluminium bronze ingot (Cu-9.97Al-5.4Fe-4.52Ni-1.05Mn- 0.62Zn-0.045Zr-0.03Sr- 0.057Sc) has no significant change in the phase composition, which is composed of α-phase, β-phase (high-temperature phase) and κ-phase, and each phase is remarkably refined. The alloy hardness increases from 212.1HV to 240.7HV. The corrosion occurs preferentially in eutectoid region (α-phase+κIII-phase), but the refinement of the eutectoid microstructure reduces the probability of generating the corrosion channel. So, in 3.5%NaCl water solution, the micro-alloying nickel-aluminium bronze ingot presents better corrosion and tribological properties, the uniform corrosion rate and the electrochemical corrosion rate decrease by 5.2% and 17.8%, the corrosion rates of micro-alloying nickel-aluminium bronze are 0.023 mm/a and 0.231 mm/a, and the friction coefficient decreases by 23.4% (friction coefficient is 0.019 3), respectively.
Key words: nickel-aluminium bronze; micro-alloying; microstructure; corrosion resistance; friction-wear properties
