(1. 南京工程學(xué)院 材料工程學(xué)院，南京 211167； 2. 南京工程學(xué)院 江蘇省先進(jìn)結(jié)構(gòu)材料與應(yīng)用技術(shù)重點(diǎn)實(shí)驗(yàn)室，南京 211167)
摘 要: 采用化學(xué)鍍技術(shù)在碳鋼表面制備Ni-P和Ni-Cu-P鍍層，通過(guò)電化學(xué)方法評(píng)定Ni-P和Ni-Cu-P鍍層在人造海水中的耐蝕性。結(jié)果表明：非晶Ni-P和Ni-Cu-P、納米晶Ni-Cu-P鍍層的腐蝕電流密度均隨著人造海水溫度升高而增大，而阻抗值則減小；共沉積Cu有利于改善非晶Ni-P鍍層的耐蝕性，但改善效果隨著人造海水溫度的升高而減小；400 ℃熱處理可顯著改善Ni-Cu-P鍍層在人造海水中的耐蝕性，在80 ℃的人造海水中，熱處理Ni-Cu-P鍍層的腐蝕電流密度較鍍態(tài)Ni-Cu-P鍍層的低一個(gè)數(shù)量級(jí)。
關(guān)鍵字: Ni-P鍍層；Ni-Cu-P鍍層；人造海水；腐蝕電流密度；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
