本研究藉由電鍍法在7075-T6鋁合金表面經陽極處理後建立電鍍鎳-奈米碳管複合鍍層“製程-鍍層微結構-磨耗腐蝕性質”的關係,以探討電鍍鎳-奈米碳管複合鍍膜在3.5%NaCl溶液下,分析鍍膜的磨耗抗腐蝕性。 實驗中使用原基材經陽極處理,電鍍操作條件分別為鍍液溫度(50℃~55℃)、電流密度(400mA) ,電鍍鎳-奈米碳管30分鐘,並使用電化學動態極化方法,量測分析鍍膜的抗腐蝕性,以塊對環(Block-on-ring)摩擦方式進行磨耗腐蝕試驗,然後以表面光學顯微鏡(OM)、掃瞄式電子顯微鏡(SEM)、及X光能量散射分析儀(EDS) 、維克氏微硬度試驗機(Hv)、原子力顯微鏡(AFM)等,觀察鍍膜表面與截面組織的形態、鍍層的元素成份分析、量測表面硬度與粗糙度。 研究結果顯示7075-T6鋁合金表面經陽極處理後硬度值增加,而試片陽極處理後在電鍍鎳液中能有效的增加表面晶粒均勻附著力及硬度值,在電鍍鎳層加入奈米碳管(1﹪)更能增加鍍膜之抗腐蝕性及磨耗腐蝕性上的應用,陽極處理將能有效提升對於複合鍍層在沉積速率與附著性等明顯的改進效果。
This thesis uses electroplating process to prepare Ni-CNT composite coating on 7075-T6 Aluminum Alloy surface by means of adding different concentrations of alumina powder (1.3.5+30min) to Ni-CNT plating solution, analysis mechanical properties in addition to evaluate the corrosion and wear-corrosion resistance of electroplating Ni-CNT composite coating in 3.5% NaCl solution, also discussing with related micro-structural analysis results. Experimental results indicated that electroplating Ni-CNT composite coating high hardness and wear-corrosion resistance, and the hardness of coatings increase with the coating content of alumina powder particles. Moreover, experimental result found that the concentration of adding 3min+30min alumina powder the electroplating Ni-CNT compound coating on 7075-T6 Aluminum Alloy substrate had the excellent corrosion resistance characteristics in 3.5% NaCl solution.