耐鋁液侵蝕性能
(湖南科技大學(xué) 機(jī)械設(shè)備健康維護(hù)重點(diǎn)實(shí)驗(yàn)室， 湘潭 411201)
摘 要: 研究電沉積Ni-P/納米Al2O3復(fù)合鍍層的干摩擦磨損性能和耐鋁液侵蝕性能，采用掃描電鏡(SEM)觀察Ni-P/納米Al2O3復(fù)合鍍層的磨損表面形貌以及鋁與Ni-P/納米Al2O3復(fù)合鍍層的界面結(jié)構(gòu)。結(jié)果表明：Ni-P/納米Al2O3復(fù)合鍍層(鍍態(tài))與淬火45鋼對摩時(shí)的摩擦因數(shù)為0.45~0.55，磨損表現(xiàn)為疲勞剝落；經(jīng)400 ℃熱處理后，Ni-P/納米Al2O3復(fù)合鍍層與淬火45鋼對摩的摩擦因數(shù)為0.20~0.24，磨損機(jī)理表現(xiàn)為輕微粘著和磨蝕；鋁液在Ni-P/納米Al2O3復(fù)合鍍層表面的潤濕角為109˚，Ni-P/納米Al2O3復(fù)合鍍層具有良好的耐鋁液侵蝕性能。
關(guān)鍵字: Ni-P/納米Al2O3復(fù)合鍍層；脈沖電沉積；耐蝕性能；疲勞剝落；粘著；磨蝕
（Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment,
Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:The tribological properties under dry sliding condition and erosion resistance of Ni-P/nano-Al2O3 composite coatings pulse electroplated to aluminum liquid were investigated. The worn surface morphologies of the coatings and the interface structures between aluminum and Ni-P/nano-Al2O3 composite coatings were observed by scanning electron microscopy (SEM). The results demonstrate that the friction coefficient of the as-deposited composite coatings against quenched 45 steel is 0.45−0.55; its wear mechanism is fatigue flake. The friction coefficient of 400 ℃ heat-treated composite coatings against quenched 45 steel is 0.20−0.24; their worn surfaces exhibit slight adhesion and abrasion. The wetting angle of the aluminum liquid on the composite coatings is 109˚, showing that the composite coatings present good erosion resistance to the aluminum liquid.
Key words: Ni-P/nano-Al2O3 composite coating; pulse electroplating; erosion resistance; fatigue flake; adhesion; abrasion
