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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Ni-WC纳米复合镀层的制备及钝化性能研究
DOI: 10.3724/SP.J.1037.2013.00131, PP. 1185-1190
Keywords: 纳米复合镀层,Ni-WC,腐蚀,钝化膜,硬度
Abstract:
利用直流复合电镀方法将WC纳米颗粒均匀分散到Ni镀层,用微米压痕仪测试了镀层的力学性能,用动电位极化曲线研究了镀层在pH=9.0的0.05mol/LH3BO3+0.075mol/LNa2B4O7缓冲溶液中的电化学性能.结果表明,与纯Ni镀层相比,纳米复合镀层的晶粒尺寸显著减小,约为21nm;硬度提高了81%,达到651HV;自腐蚀电流密度降低约一个数量级,约为1.29×10-7A/cm2;破钝电位基本一致,但致钝电位(10mV)更低,维钝电流密度(1.79×10-6A/cm2)更小,仅为纯Ni镀层的1/7.利用Mott-Schottky理论结合点缺陷模型分析表明表面钝化膜仍具有p型半导体特征,WC纳米颗粒显著降低基体Ni的晶粒尺寸,引起钝化膜中点缺陷密度和扩散系数的降低.
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