摘要
利用改变脉冲频率,采用脉冲电镀法在黄铜片基体上制备出纳米晶Fe-Ni-Cr合金镀层。采用SEM和EDS对镀层的表面形貌和成分进行表征,采用XRD对镀层的结构进行表征,采用电化学工作站对镀层的极化曲线和电化学阻抗进行表征。结果表明:当脉冲频率为5000 Hz时,镀层的表面较为平整,成分稳定,晶粒尺寸约为12 nm,镀层在3.5%Na Cl溶液的自腐蚀电位约为-200 m V,自腐蚀电流密度约为0.12μA/cm2,电荷转移电阻约为2500Ω/cm2。频率的改变能引起镀层晶粒尺寸的改变,合适的频率有利于合金的形核,显著改善了镀层的耐蚀性能。
Nanocrystalline Fe-Ni-Cr alloy coatings were deposited on brass substrate by pulse electroplating with variant pulse frequencies, which then were characterized by SEM and EDS, as well as by XRD. The polarization curve and AC impedance of the coating were examined by electrochemical workstation. The results show that the coating prepared by pulse frequency 5000 Hz is nanocrystalline with mean grain size ca 12 nm, as well as a much smooth and uniform surface morphology, of which the corrosion current density, corrosion potential and the charge transfer resistance in 3.5% Na Cl solution were-200 m V, 0.12 μA/cm2, 2500 Ω/cm2 respectively. It is believed that proper pulse frequencies may be beneficial to increase the number of nucleation sites of the deposits resulting in a coating with fine grain sized nanocrystallites, and better corrosion resistance.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2015年第4期353-357,共5页
Corrosion Science and Protection Technology
基金
辽宁省自然科学基金项目(201202127)资助
