发动机气缸电喷镀镍磷合金镀层及耐腐蚀性能

为提高发动机气缸的耐久性，该文采用喷射电沉积法在发动机气缸上制备Ni-P合金镀层，并用电化学极化曲线方法和交流阻抗技术对比研究镀有Ni-P合金的发动机气缸在50 g/L的NaCl溶液中不同时刻的腐蚀规律和腐蚀机理。结果表明，随着浸泡时间的增加，原始氧化膜减薄，膜层下的Ni-P合金暴露在溶液中产生活性溶解，随后电极表面有腐蚀产物聚集，阻碍腐蚀的进行；腐蚀过程由活化控制转变为镀层和腐蚀产物内的扩散控制；电喷镀所得Ni-P镀层在NaCl溶液中的耐腐蚀性能约是传统电沉积的5倍左右，发动机气缸电喷镀Ni-P合金镀层后具有良好的耐蚀性。研究结果可为进一步提高镍磷镀层的耐腐蚀性能提供参考。...

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Bibliographic Details
Published in农业工程学报 Vol. 30; no. 15; pp. 54 - 61
Main Author 王颖 康敏 傅秀清 王兴盛
Format Journal Article
LanguageChinese
Published 江苏省智能化农业装备重点实验室，南京 210031 2014
南京农业大学工学院,南京,210031%南京农业大学工学院，南京 210031
Subjects
交流阻抗谱
发动机
极化曲线
电喷镀
耐腐蚀性
交流阻抗谱
极化曲线
electrochemical impedance spectroscopy
polarization curve
发动机
engines
jet electrodeposion
耐腐蚀性
电喷镀
corrosion resistance
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2014.15.008

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Summary:为提高发动机气缸的耐久性，该文采用喷射电沉积法在发动机气缸上制备Ni-P合金镀层，并用电化学极化曲线方法和交流阻抗技术对比研究镀有Ni-P合金的发动机气缸在50 g/L的NaCl溶液中不同时刻的腐蚀规律和腐蚀机理。结果表明，随着浸泡时间的增加，原始氧化膜减薄，膜层下的Ni-P合金暴露在溶液中产生活性溶解，随后电极表面有腐蚀产物聚集，阻碍腐蚀的进行；腐蚀过程由活化控制转变为镀层和腐蚀产物内的扩散控制；电喷镀所得Ni-P镀层在NaCl溶液中的耐腐蚀性能约是传统电沉积的5倍左右，发动机气缸电喷镀Ni-P合金镀层后具有良好的耐蚀性。研究结果可为进一步提高镍磷镀层的耐腐蚀性能提供参考。
Bibliography:11-2047/S
Wang Ying,Kang Min,Fu Xiuqing,Wang Xingshen （1. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China; 2. Jiangsu Key Laboratory for Intelligent Agricultural Equipment, Nanjing 210031, China）
Cylinder is the important part of tractor engine, which service life and the production cost are directly affected by anti-corrosion of the component. With the excellent wear resistance, corrosion resistance and higher hardness, Ni-P alloy deposited layer plays an important role for enhance the service life and reliability of cylinder, and the capability and quality of the tractor engine can be improved. Because of severe working environment of cylinder and piston such as high temperature, high load, high-velocity motion, poor lubrication, difficult cooling, especially weak acid for work environment, it is advisable to study the anti-corrosion properties of Ni-P alloy coated on engine cylinder. However, with the advancement of social economy, the conventional method for electrodeposited N
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2014.15.008