鎳鈷磷合金無電鍍製程及性質研究

Process and Properties of Electroless Ni-Co-P Alloy Deposition

楊睿瑜(Ruei-Yu Yang)

指導教授 ： 陳貞光

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00180

摘要

本研究以無電鍍法沉積鎳鈷磷合金進行表面披覆，目的為結合鎳的機械性質與鈷的耐腐蝕性質，期能找出兼具兩者特性的複合金屬鍍膜以保護底材。本實驗中的無電鍍鍍浴使用鹼浴，以一小時的析鍍時間為單位，利用不同的鍍液pH值、調整鎳與鈷在鍍浴中的比率來製作不同鎳鈷含量的合金鍍層，比較不同鍍液pH值與鈷含量對沉積速度與鍍層成分的影響，並對鍍層進行熱處理，比較熱處理前後之結構與性質差異。
研究結果顯示，鍍浴之pH值在長時間析鍍下對鍍層成分的影響不明顯，但鍍浴pH值為10時，其沉積速度最快、可以獲得最高之鍍層厚度。鍍層中的鎳鈷成分在巨觀下來說，是隨著鍍液鎳鈷成分比改變，但在微觀下會因為析鍍過程中pH值變動，導致鎳鈷析出速率不同而使成分產生變化。
在機械性能與電化學性能的檢測方面，本實驗以延長沉積時間的方式加厚鍍層，接著進行微硬度試驗、磨耗試驗、與電位腐蝕試驗來判斷各鍍層之優劣。其中硬度與磨耗性質以經過400°C並持溫一小時的熱處理後、成分鎳62 at%、鈷25 at%、磷13 at%之鍍層為最佳。耐腐蝕則以無熱處理，成分鎳62 at%、鈷25 at%、磷13 at%之鍍層為最佳。

關鍵字

無電鍍 ； 鎳鈷磷合金 ； 磨耗 ； 腐蝕

並列摘要

Ni-Co-P alloy coatings were deposited on S45C medium carbon steel by electroless deposition for wear and corrosion resistance enhancement. Electroless Ni-Co-P ternary alloy deposits were prepared using alkaline bath by varying the metallic ratio and pH values of the plating baths. The plating rates of electroless Ni-Co-P coating are found to vary with pH values of the plating baths and the metallic ratio. After heat treatment at 400°C for 1 hour, the structures and surface morphology of coatings were compared with those of as-deposit coatings.
The ratios of nickel and cobalt in coatings are proportional to the compositions of plating bath. Although, the pH values of plating baths do not vary the coating composition in macro scale, the changes of pH values during depositions result in microscopic changes of nickel cobalt deposition rate. At pH value of 10, the plating bath obtains the highest deposition rate.
The thicker coatings are deposited for characterizations of microhardness, wear, and corrosion tests. The deposition with combination of optimum properties is composed of 45 at% Ni, 44 at% Co, and 11 at% P after 400°C heat treatment.

並列關鍵字

electroless deposition ； Ni-Co alloy ； wear ； corrosion

參考文獻

[27] 林逸旻，「碳化物噴覆處理鋼之磨耗行為」，大同大學材料工程研究所碩士論文，2009。

[19] H. G. Schenzel and H. Kreye, “Improved corrosion resistance of electroless nickelphosphorus coating,” Plating and Surface Finish, vol. 77, no.10, 1990, p. 50.

[1] G.O. Mallory and J.B. Hajdu, Electroless Plating: Fundamentals and Applications, Orlando USA :AESF, 1990.

[3] A.H. Graham, R.W. Lindsay, and H.J. Read, "The structure and mechanical properties of electroless nickel,” Electrochemical Soc, vol.112 ,no. 4, 1965, p 401.

[9] W. P.Chen , S. G. Lu, and H. L. Chan, “Influence of Electrless Nickel Plating on I-V Characteristics and its Implications for Reliability in Zno-Based Ceramic Varistors” , Materials Science and Engineering, vol.99, 2003, pp.70-73.