低磷含量鎳磷合金電鍍層之耐蝕性與機械性質研究

The Study of Corrosion Resistance and Mechanical Properties of Low Phosphorous Content Nickel Plated Coatings

謝曉華(S. H. Hsieh) ； 黃財賞(T. S. Huang)

《防蝕工程》 23卷2期 (2009/06) Pp. 87-94

https://doi.org/10.6376/JCCE.200906.0087

摘要

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 LIV after being heat- treated at 300℃. 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.

關鍵字

鎳磷合金鍍層 ； 電鍍 ； 耐蝕特性

並列摘要

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 LIV after being heat- treated at 300℃. 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.

並列關鍵字

Nickel-Phosphorous plated layer ； Electroplating ； Corrosion resistance