摘要
在不含糖精和含有1g/L糖精的镀液中,采用脉冲电镀法在黄铜基体上分别制备出纳米晶镍-铁合金镀层。采用SEM,EDS,XRD和电化学工作站对镀层的表面形貌、名义成分、结构、极化曲线和交流阻抗谱进行测试。结果表明:当镀液中不含糖精时,镀层的自腐蚀电流密度为0.281μA/cm2,沉积镀层电阻为122 800Ω.cm2,且具有较明显的钝化趋势;当镀液中含有1g/L糖精时,镀层的自腐蚀电流密度为0.778μA/cm2,沉积镀层电阻为24 450Ω.cm2,且钝化趋势不明显。糖精的加入引起镀层晶粒细化及晶界体积分数增加,是造成纳米晶镍-铁合金镀层耐蚀性下降的原因。
The nanocrystalline Ni-Fe alloy coating was prepared on brass substrate by pulse electroplating in plating solutions without saccharin and with 1 g/L of saccharin respectively. The morphology, nominal composition, structure, polarization curve and AC impedance of the coating were tested by SEM, EDS, XRD and electrochemical workstation. The results show that： when the bath does not contain saccharin, the self-corrosion current density of the coating is 0.281μA/cm^2 , and the resistance of the deposit is 122800Ω·cm^2 , with an obvious passivation tendency; when the plating solution contains 1 g/L of saccharin, the self-corrosion current density of the coating is 0.778μA/cm^2, and the resistance of the deposit is 24450Ω·cm^2 , with no obvious passivation tendency. Addition of saccharin causes finer grains and increasing grain boundary volume fraction, which is one of the reasons for decreased corrosion resistance of nanocrystalline Ni Fe alloy.
出处
《电镀与环保》
CAS
CSCD
北大核心
2013年第3期21-24,共4页
Electroplating & Pollution Control
基金
辽宁省高等学校杰出青年学者成长计划(编号:LJQ2011033)
教育部留学回国人员科研启动基金项目资助
关键词
脉冲电镀
纳米晶
镍-铁合金
耐蚀性
糖精
pulse plating
nanocrystalline
Ni-Fe alloy
corrosion resistance
saccharin
