(1. 湖南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410082;
2. 浙江大學(xué) 化學(xué)系， 杭州 310027)
摘 要: 通過改變次磷酸鹽體系的工藝參數(shù)制得不同的鎳磷合金鍍層。 采用電化學(xué)阻抗譜技術(shù)（簡稱EIS技術(shù)）和動電位掃描極化曲線技術(shù)， 研究了不同工藝參數(shù)時鎳磷鍍層在0.5 mol/L NaCl中性介質(zhì)中的耐蝕性規(guī)律和耐蝕機理。 結(jié)果表明： 電鍍鎳磷合金鍍層耐蝕性隨鍍液pH值的降低而升高, 并隨鍍液中次磷酸鹽濃度的升高而升高， 并在次磷酸鹽濃度為110 g/L時到最大值；而繼續(xù)增大次磷酸鹽濃度鍍層的耐蝕性又降低； 低溫（40 ℃）制得的鍍層比高溫（60 ℃）下制得的鍍層更耐蝕。
關(guān)鍵字: 次亞磷酸鹽； 鎳磷合金； 鍍層； 耐蝕性
deposits prepared from electrolytes
containing NaH2PO2·H2O
CHEN Zhen-hua1, WU You-wu1
（1. College of Materials Science and Engineering,
Hunan University, Changsha 410082, China;
2. Department of Chemistry, Zhejiang University, Hangzhou 310027, China）
Abstract: The different NiP deposits was prepared through electrolyte systems with different NaH2PO2·H2O concentration. The anti-corrosion mechanism of these deposits in 0.5 mol/L NaCl neutral solutions was studied by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization method. The results show that the corrosion resistance of NiP deposits increases with the decrease of pH, and increases first with the increase concentration of NaH2PO2·H2O in electrolyte, while it reaches a maximum at 110 g/L NaH2PO2·H2O, then decreases with the further increase of NaH2PO2·H2O concentration. The corrsion resistance of the deposits acquired at low temperature is better.
Key words: NaH2PO2·H2O; Ni-P alloy; electroplated deposit; anti-corrosion properties
