電沉積鎳–鎢／鑽石複合鍍層之磨潤與耐蝕性之研究

Study on the Wear and Corrosion Resistance Properties of Electrodeposited Ni-W/diamond Composite Coatings

本研究利用電沉積製程於添加鑽石微粒之Ni-W鍍液中製備出不同鑽石微粒含量之Ni-W/diamond複合鍍層，探討鍍液中不同鎳鎢離子濃度比對鑽石微粒與金屬離子共沉積之影響，並以XRD檢測鍍層之相組成及結構特性。Ni-W/diamond複合鍍層之晶粒尺寸較Ni-W合金鍍層略小，表面形貌亦較鎳-鎢合金鍍層平整及緻密。利用3.5 wt.%氯化鈉溶液中於室溫下所測得之極化曲線來評估Ni-W合金及Ni-W/diamond複合鍍層之腐蝕性質，結果顯示鑽石微粒共沉積於Ni-W合金鍍層中可增進鍍層之耐蝕性，另外鑽石微粒共沉積於鍍層中可增加鍍層之微硬度並降低磨耗損失，提升其耐磨性。

Ni-W/diamond composite coatings with various contents of diamond particles were prepared by electrodeposition in Ni-W plating bath. The influences of various nickel concentration in the plating bath on diamond particles co-deposited in the composite coatings was evaluated. The phase constitution and crystal structure was analyzed by using XRD. The grain size and morphology of Ni-W/diamond composite coating were smaller and smoother than those of Ni-W alloy coating. The corrosion behaviors of Ni-W alloy and Ni-W/diamond composite coatings were evaluated by the anodic polarization curves in 3.5 wt.% NaCl solution at room temperature. It showed that the corrosion resistance ability of the coating was improved by co-depositing diamond particles in Ni- W alloy coating. In addition, co-deposition of diamond particles in the coatings increased the micro-hardness and reduced the weight loss after wear test, implying the improvement of the wear resistance of the coating.