Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第10期    总第79期    2005年10月

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文章编号: 1004-0609(2005)10-1642-06
次磷酸盐体系电镀镍磷合金镀层的耐蚀性能
刘应科1, 程英亮1, 张 昭2, 王慧敏1, 陈振华1, 吴有伍1

(1. 湖南大学 材料科学与工程学院, 长沙 410082;
2. 浙江大学 化学系, 杭州 310027
)

摘 要:  通过改变次磷酸盐体系的工艺参数制得不同的镍磷合金镀层。 采用电化学阻抗谱技术(简称EIS技术)和动电位扫描极化曲线技术, 研究了不同工艺参数时镍磷镀层在0.5 mol/L NaCl中性介质中的耐蚀性规律和耐蚀机理。 结果表明: 电镀镍磷合金镀层耐蚀性随镀液pH值的降低而升高, 并随镀液中次磷酸盐浓度的升高而升高, 并在次磷酸盐浓度为110 g/L时到最大值;而继续增大次磷酸盐浓度镀层的耐蚀性又降低; 低温(40 ℃)制得的镀层比高温(60 ℃)下制得的镀层更耐蚀。

 

关键字:  次亚磷酸盐; 镍磷合金; 镀层; 耐蚀性

Anti-corrosion properties of Ni-P alloy
deposits prepared from electrolytes
containing NaH2PO2·H2O
LIU Ying-ke1, CHENG Ying-liang1, ZHANG Zhao2, WANG Hui-min1,
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 NiP 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 NiP 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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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