电沉积制备Ni-Co-Ce复合镀层及其耐蚀性能研究
Study on Electrodeposition Preparation and Corrosion Resistance of Ni-Co-Ce Composite Coatings
胡越 1梁智鹏 1李继东 1路金林 2陈东旭 1金森虎1
作者信息
- 1. 辽宁科技大学材料与冶金学院,辽宁鞍山 114000
- 2. 广州航海学院轮机工程学院,广东广州 510000
- 折叠
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0.6g/L,电流密度0.04 A/cm2,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/cm2和-0.534 V,电荷转移电阻最大,为889.81 Ω·cm2,耐蚀性能最好.
Abstract
Ni-Co alloy coatings have good corrosion resistance and are mostly used for metal corrosion pro-tection.The addition of Ce to the alloy coatings can refine the crystal grains and improve the microstruc-ture 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 po-tentiodynamic 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 micro-scope and X-ray diffractometer.The results show that the optimal electrodeposition conditions of the coat-ings are a cerous sulfate concentration of 0.6 g/L,a current density of 0.04 A/cm2,and an electrodeposi-tion 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 3.694 5 × 10-6 A/cm2 and-0.534 V,respectively.In addition,the above coating exhibits the maximum charge transfer impedance of 889.81 Ω·cm2,having the best corrosion resistance.
关键词
船用钢/Ni-Co-Ce镀层/电沉积/电化学分析/耐腐蚀性能Key words
marine steel/Ni-Co-Ce coating/electrodeposition/electrochemical analysis/corrosion resistance引用本文复制引用
基金项目
国家自然科学基金面上项目(52374352)
辽宁省教育厅高等学校重点攻关项目(JYTZD2023091)
出版年
2024
NETL
NSTL
万方数据