摘要
Ni-Co合金镀层具有较好的耐蚀性,多用于金属防腐,添加Ce可细化该合金镀层晶粒,提高组织致密性及耐蚀性。以船用钢EH40为基体,采用复合电沉积工艺在其表面制备Ni-Co-Ce合金镀层,并在3.5%NaCl溶液中对不同工艺条件下制备的镀层进行动电位极化曲线测试和电化学阻抗测试,评价其耐腐蚀性能。采用扫描电镜和X射线衍射仪对镀层的表面形貌和物相组成进行了分析。结果表明,镀层最佳电沉积工艺条件为硫酸铈浓度0.6 g/L,电流密度0.04 A/cm^(2),电沉积温度50℃;此条件下获得的镀层表面平整,自腐蚀电流和电位(绝对值)均最低,分别为3.694 5×10^(-6) A/cm^(2)和-0.534 V,电荷转移电阻最大,为889.81Ω·cm^(2),耐蚀性能最好。
Ni-Co alloy coatings have good corrosion resistance and are mostly used for metal corrosion protection.The addition of Ce to the alloy coatings can refine the crystal grains and improve the microstructure densification and corrosion resistance of the alloy coatings.Using marine steel EH40 as the substrate,Ni-Co-Ce alloy coatings were prepared on its surface by composite electrodeposition process.The corrosion resistance of the alloy coatings prepared under different process conditions was tested through tests of potentiodynamic polarization curve and electrochemical impedance spectroscopy in a 3.5%NaCl solution.The surface morphology and phase composition of the coatings were investigated by scanning electron microscope and X-ray diffractometer.The results show that the optimal electrodeposition conditions of the coatings are a cerous sulfate concentration of 0.6 g/L,a current density of 0.04 A/cm^(2),and an electrodeposition temperature of 50℃.Under these conditions,the prepared coating possesses smooth surface,with the lowest self-corrosion current and self-corrosion potential(absolute value)of 3.6945×10^(-6)A/cm^(2) and-0.534 V,respectively.In addition,the above coating exhibits the maximum charge transfer impedance of 889.81Ω·cm^(2),having the best corrosion resistance.
作者
胡越
梁智鹏
李继东
路金林
陈东旭
金森虎
HU Yue;LIANG Zhi-peng;LI Ji-dong;LU Jin-lin;CHEN Dong-xu;JIN Sen-hu(College of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114000,China;College of Marine Engineering,Guangzhou Navigation University,Guangzhou 510000,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2024年第2期38-44,共7页
Rare Metals and Cemented Carbides
基金
国家自然科学基金面上项目(52374352)
辽宁省教育厅高校重点攻关项目(JYTZD2023091)。
