糖精对脉冲电镀纳米晶镍-铁合金镀层耐蚀性的影响  

Influence of Saccharin on Corrosion Resistance of Nanocrystalline Ni-Fe Alloy Coating Prepared by Pulse Plating

作　　者：孙冬来[1,2] 陈吉[1] 储刚[3] 史艳华[1] 梁平[1] 

机构地区：[1]辽宁石油化工大学机械工程学院石油化工过程腐蚀与防护技术中心,辽宁抚顺113001 [2]甘肃蓝科石化高新装备股份有限公司,甘肃兰州730070 [3]辽宁石油化工大学化学与材料科学学院,辽宁抚顺113001

出　　处：《电镀与环保》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

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.

关 键 词：脉冲电镀 纳米晶 镍-铁合金 耐蚀性 糖精 

分 类 号：TQ153[化学工程—电化学工业]