摘要
采用电沉积技术制备了纳米晶镍-钨-稀土合金镀层,重点研究了其制备工艺及镀层性能,探讨了电流密度、电沉积时间、镀液中稀土含量、镀液pH值和镀液温度等因素对镀层沉积速率的影响;用SEM、XRD、EDS、阳极极化曲线等方法分析了镀层的表面形貌、结构、组成、耐蚀性和抗氧化性等。结果表明:合金镀层的最佳制备工艺条件为电流密度9.5 A·dm^(-2)、镀液pH值7、电沉积时间70 min、镀液温度50℃、镀液中NdCl_3添加量4.5 g·L^(-1)或镀液中Ce(SO_4)_2添加量3 g·L^(-1);添加稀土元素钕、铈后合金镀层表面颗粒排列致密、均匀,表面无裂纹,其抗高温氧化性和耐蚀性能与硬铬镀层比较相差较小。
Nanocrystalline Ni-W-RE alloy coatings were prepared by electrodeposition and the performance and preparation technology were studied.The effects of current density,time of deposition,RE content in plating solution,pH value and temperature on the deposition rate of the coatings were studied.Surface morphology, structure,composition,corrosion resistance and oxidation resistance of composite coatings were tested by SEM, XRD,EDS and anodic polarization curves etc.The results show that the optimized preparation conditions of composite coatings were current density 9.5 A·dm^（-2）,pH=7,time of electrodeposition 70 min,temperature of the solution 50℃,NdCl_3 content in the solution 4.5 g·L^（-1） and Ce（SO_4）_2 content 3g·L^（-1）.The surface grains of the alloy coatings arranged densely,uniformly and without cracks after adding the RE elements of Nd and Ce.And the high temperature oxidation resistance and corrosion resistance of Ni-W-Nd alloy coatings were only a littre different from those of the hard chromium plating.
出处
《机械工程材料》
CAS
CSCD
北大核心
2010年第5期76-80,97,共6页
Materials For Mechanical Engineering
基金
广西自然科学基金资助项目(0731015)
关键词
电沉积
纳米晶
镍-钨合金镀层
稀土
electrodeposition
nanocrystalline
Ni-W alloy coating
rare earth
