瓦特浴電鍍鎳鎢磷合金及其鍍層之機械性質研究

Study on the Mechanical Properties of Ni-W-P Alloy Coating Electrodeposited from Modified Watts Bath

周弘道(Hung-Tao Chou)

指導教授 ： 李春穎

國立臺北科技大學/機電學院/製造科技研究所/碩士(2013年)

摘要

本研究目的在於探討電鍍鎳-鎢-磷合金在表面處理上各項電鍍條件影響。製程上將採用硫酸鎳、亞磷酸和鎢酸鈉電鍍液系統製備鎳-鎢-磷合金。針對可能影響鍍層硬度因素，如鍍層之元素含量及奈米組織結構，運用Alpha-Step、FESEM、XRD進行材料微結構觀察與分析。
實驗結果顯示其鍍層硬度、耐高溫、抗磨耗和耐腐蝕性能比純鎳、鎳鎢及鎳磷合金較優良，電流密度提升對於鍍層中鎢含量影響較為明顯，硬度相對提高，但電鍍效率較低，且會導致鍍層表面較不平整情形。亞磷酸的添加量增加則相對影響鍍層中磷含量，電鍍效率相對應降低。而脈衝電鍍能使鍍層鍍層鎢含量提升，且具有降低鍍層內應力和提高電鍍效率之效果。鍍液中pH值越高，鍍層內應力提升，鍍層產生裂紋，且電鍍效率越差。在適當的熱處理溫度下，鎳鎢磷合金的硬度可達900∼1100HV，耐磨耗性相對應提高。具有替代硬鉻表面處理能力。

關鍵字

瓦特浴 ； 電鍍 ； 鎳鎢磷合金

並列摘要

The main purpose of this study is to investigate the effects of various process parameters electrodeposited Ni-W-P alloy on the surface treatment using. The modified Watts bath consisted of nickel sulfate, phosphorous acid and Sodium tungstate solution. The Alpha-Step profilometer, FESEM, XRD were employed for observation and analysis of material microstructure in order to determine the critical factor which inference the coating hardness, such as element content and microstructure of the coating.
The experimental results showed that coating hardness, heat-resistant, wear resistance and corrosion resistance is better than nickel, Ni-W alloy and Ni-P alloy. Increasing current density had obvious effect on the coating tungsten content. The hardness of the coating was increased, but the electroplated efficiency was lower, and the roughness of increased the coating surface. The phosphorus content in coating became higher with the raise in the added amount phosphorous acid, which electroplated efficiency was lower. The use of pulse plating increased tungsten content in coating, and reduced internal stress and improved electroplated efficiency. In addition raising the pH value in solution caused increases in internal stress, the coating surface cracks, and lowered electroplated efficiency. With annealing at appropriate temperature, the Ni-W-P alloy coating hardness reached 900~1100HV, which increased the wear resistance, and became a potential candidate for replacing hard chromium coating.

並列關鍵字

Watts bath ； Electrodeposited ； Ni-W-P Alloy

參考文獻

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