(1. 南京工程学院 材料工程学院，南京 211167； 2. 南京工程学院 江苏省先进结构材料与应用技术重点实验室，南京 211167)
摘 要: 采用化学镀技术在碳钢表面制备Ni-P和Ni-Cu-P镀层，通过电化学方法评定Ni-P和Ni-Cu-P镀层在人造海水中的耐蚀性。结果表明：非晶Ni-P和Ni-Cu-P、纳米晶Ni-Cu-P镀层的腐蚀电流密度均随着人造海水温度升高而增大，而阻抗值则减小；共沉积Cu有利于改善非晶Ni-P镀层的耐蚀性，但改善效果随着人造海水温度的升高而减小；400 ℃热处理可显著改善Ni-Cu-P镀层在人造海水中的耐蚀性，在80 ℃的人造海水中，热处理Ni-Cu-P镀层的腐蚀电流密度较镀态Ni-Cu-P镀层的低一个数量级。
关键字: Ni-P镀层；Ni-Cu-P镀层；人造海水；腐蚀电流密度；阻抗值
（1. School of Material Engineering, Nanjing Institute of Technology, Nanjing 211167, China; 2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology, Nanjing 211167, China）
Abstract:The Ni-P and Ni-Cu-P coatings were deposited on carbon steel surface by electroless plating technique. Their corrosion resistances in artificial seawater were evaluated by electrochemical test. The results show that the corrosion current densities of amorphous Ni-P and Ni-Cu-P coatings and nanometer crystalline Ni-Cu-P coatings increase with the increase of artificial seawater temperature. However, their impedance values decease. The corrosion resistance of amorphous Ni-P coating in artificial seawater can be improved by co-depositing Cu element. However, the difference of the corrosion resistance between the Ni-Cu-P and Ni-P coatings gradually decreases with the increase of the artificial seawater temperature. The corrosion resistance of Ni-Cu-P coating in warm artificial water can be greatly improved by annealing at 400 ℃. The corrosion current density of Ni-Cu-P coating annealed at 400 ℃ is an order magnitude lower than that of as-plated Ni-Cu-P coating in 80 ℃ artificial seawater.
Key words: Ni-P coating; Ni-Cu-P coating; artificial seawater; corrosive current density; impedance value
