本研究在經適當陽極處理後的2024-T6鋁合金基材表面以無電鍍法鍍析出鎳磷/鑽石/石墨烯複合鍍層,探討添加不同大小鑽石粒子(6-12 μm與0.2 μm)與經由真空退火熱處理後的鎳磷複合鍍膜的表面結構、導電性、耐磨耗腐蝕與耐腐蝕性的影響效應。研究結果顯示2024-T6鋁合金經由陽極處理後可成功地析鍍上N-P/diamond/graphene複合鍍層,更能增加表面硬度,也能提供2024-T6鋁合金基材的腐蝕與磨耗腐蝕保護性。石墨烯的添加可降低電阻率與提供潤滑性,使Ni-P/diamond/graphene有最佳的耐磨耗腐蝕性,尤其添加較細小的鑽石粒子與經真空退火熱處理更有強化耐腐蝕與磨耗腐蝕的作用。
The purpose of the present study is to evaluate the effect of the electroless Ni-P/diamond/graphene composite coating on the structure, conductivity and surface hardness of 2024-T6 aluminum alloy as well as their effect on the corrosion and wear-corrosion resistance of the alloy in 3.5 wt% NaCl solution. The electroless Ni-P/diamond/graphene plating solution was prepared by adding different size diamond (6-12 μm and 0.2 μm) and nano-graphene into the electroless Ni-P plating solution to obtain different Ni-P/diamond, Ni-P/graphene and Ni-P/daimond/graphene composite coatings for comparison. Experimental results indicated that the electroless N-P/diamond/graphene composite coating could be successfully electroless deposited upon suitable anodized 2024-T6 aluminum alloy substrate. The composite coating had a beneficial effect to enhance the hardness and conductivity as well as corrosion and wear-corrosion resistance of 2024-T6 alloy in 3.5 wt% NaCl solution. When the nano-graphene and smaller diamond particles added this beneficial effect was significantly raised, especially the composite coating after vacuum annealing treatment.