篇名 | 低磷含量鎳磷合金電鍍層之耐蝕性與機械性質研究 |
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卷期 | 23:2、23:2 |
並列篇名 | The Study of Corrosion Resistance and Mechanical Properties of Low Phosphorous Content Nickel Plated Coatings |
作者 | 謝曉華 、 黃財賞 |
頁次 | 87-94 |
關鍵字 | 鎳磷合金鍍層 、 電鍍 、 耐蝕特性 、 Nickel-Phosphorous plated layer 、 Electroplating 、 Corrosion resistance 、 EI |
出刊日期 | 200906 |
一般鎳磷合金電鍍層的內應力隨鍍層磷含量的增加而上升,造成鍍層與底材附著性不佳,在電鑄方面的應用有困難。本研究利用鍍鎳液添加微量含磷化合物的方式,進行低磷含量的鎳磷合金層電鍍,來改善鍍鎳層特性。為了解低磷含量鍍鎳層的鍍層特性,除進行鍍鎳層機械特性與耐磨耗性測試外,並利用電化學動電位極化曲線法,測量鍍層在含氟離子溶液中的耐蝕特性。研究結果發現低磷含量(< 1 wt.%)的鎳磷合金鍍層的內應力極低,鍍層經 300 °C熱處理後不軟化 , 硬度維持為 300 ~ 350 HV,高於一般純鎳鍍層的硬度(200 ~ 250HV);經砂輪耐磨耗測試,鎳磷合金鍍層磨耗重量損失僅為純鎳鍍層之 56%。耐腐蝕特性方面,鎳磷合金鍍層極化曲線顯現鈍化區,鈷鎳合金鍍層則未顯現鈍化區域,浸泡實驗的結果亦顯現鎳磷合金鍍層的耐蝕性較鈷鎳合金鍍層為優。
The internal stress of Nickel-Phosphorous (Ni-P) plated layer increases with increasing phosphorous content. A high internal stress would cause deterioration of adhesion between the plated coating and the base metal, leading to subsequent problems in electroforming applications.
In this study, a low phosphorous content nickel plating bath was used to produce low P content coatings and to improve the physical properties of the coatings. The mechanical properties and anti-wearing resistance of the coatings were tested, and the potentiodynamic polarization analysis
was conducted to measure the corrosion resistance of the plated coating in a fluoride ion containing solution. Test results showed that the internal stress of the Ni-P coating of low-P content was extremely low and the hardness was maintained at 300 ~ 350 HV after being heat-
treated at 300 °C. Under the same heat treatment, the hardness of a pure Ni plated coating decreased to 200 ~ 250 HV. Therefore, the weight loss of the Ni-P coating was only 56% of that of the pure Ni coating in the wearing test using a Taber Type Abrasion Tester. A quasi-passive region
was noticed in the potentiodynamic polarization curve of the Ni-P coating, but it was not shown in that of a cobalt-nickel coating. The immersion test in a fluoride ion containing solution also demonstrated that the Ni-P coating was superior to the cobalt-nickel coating.