摘要
利用正交实验方法研究了电流密度、镀液温度、镀液pH值等工艺参数和硫酸铬含量对镀层沉积速率和Cr含量的影响程度。确定了最佳工艺参数为电流密度25 A/dm^(2),温度为20℃,pH值为2.5,硫酸铬浓度200 g/L。利用SEM、EDS和XRD对合金镀层表面形貌、成分和微观结构进行了表征。实验结果表明,FeCoNiCr高熵合金镀层为非晶态结构,且镀层平整、光亮、成分均匀,镀层成分(原子分数)为:Fe 22.53%~26.21%,Co 23.65%~28.56%,Ni 19.53%~26.86%,Cr 23.07%~28.60%。FeCoNiCr高熵合金镀层在3.5%NaCl(质量分数)溶液中,自腐蚀电位和自腐蚀电流密度分别为-0.45 V、1.73×10^(-6) A/cm^(2),比真空热压烧结的CoCrFeNi高熵合金涂层的自腐蚀电位(-1.08 V)高、自腐蚀电流密度(9.44×10^(-6)A/cm^(2))低,因此电镀方法制备的FeCoNiCr高熵合金镀层耐腐蚀性更优。
The effects of current density,bath temperature,bath pH and chromium sulfate content on the deposition rate and Cr content of the coating of FeCoNiCr high entropy alloys were studied by orthogonal test.The optimum process parameters were determined with current density 25 A/dm^(2),temperature 20℃,pH 2.5,and chromium sulfate concentration 200 g/L.The morphology,composition and microstructure of the alloy coating were characterized by SEM,EDS and XRD.The experimental results show that the FeCoNiCr high entropy alloy coating is of amorphous structure,and the coating is smooth,bright and composition-consistent.The composition(atomic fraction)of the coating is Fe 22.53%~26.21%,Co 23.65%~28.56%,Ni 19.53%~26.86%,Cr 23.07%~28.60%.The self corrosion potential(Ecorr)of-0.45 V for the FeCoNiCr high entropy alloy coating is higher than Ecorr(-1.08 V)of the CoCrFeNi high entropy alloy coating prepared by vacuum hot pressing sintering,while the self corrosion current(icorr)of 1.73×10^(-6) A/cm^(2) in 3.5%(mass fraction)NaCl solution is lower than icorr(9.44×10^(-6) A/cm^(2)),showing enhanced corrosion resistance in the former high entropy alloy coating prepared by electrodeposition.
作者
杨海泊
于金库
郭燕青
乔琪
郭富钰
肖静静
YANG Haibo;YU Jinku;GUO Yanqing;QIAO Qi;GUO Fuyu;XIAO Jingjing(School of Material Science and Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,Hebei 066004,China)
出处
《燕山大学学报》
CAS
北大核心
2021年第4期321-327,共7页
Journal of Yanshan University
基金
河北省科学技术研究与发展计划重点基础研究项目(13961002D)
亚稳材料制备技术与科学国家重点实验室自主研究项目(20181-6)。
