贫铀表面阴极微弧电沉积氧化铝陶瓷涂层的耐腐蚀性能研究
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- 英文论文题名：Corrosion Resistance of Alumina Coating Deposited on Depleted Uranium Surface by Cathodic Microarc Method
- 论文作者：王佳佳 ; 帅茂兵 ; 何伟波
- 英文论文作者：Wang Jia Jia ; Shuai Maobing ; He Weibo ; China Academy of Engineering Physics ; Science and Technology on Surface Physics and Chemistry Laboratory
- 年：2016
- 作者机构：中国工程物理研究院;表面物理与化学重点实验室;
- 论文关键词：贫铀 ; 表面防腐蚀涂层 ; 阴极微弧电沉积 ; 氧化铝陶瓷
- 英文论文关键词：depleted uranium ; surface coating ; cathodic micro-arc deposition method ; alumina ceramic coating
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十九分会：电化学材料
- 语种：中文
- 分类号：TQ174.12
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十九分会 ; 电化学材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：175k
- 原文格式：D
- 会议级别：全国
摘要
对金属铀进行表面涂层保护是减缓甚至阻止其腐蚀的有效手段之一。本文采用阴极微弧电沉积的方法在铀表面制备氧化铝陶瓷涂层,研究了工艺条件为:贫铀表面粗糙度约Ra0.10μm,电解液(硝酸铝的乙醇溶液)浓度约1.0 mol/L、搅拌速度200~300 r/min,电流密度约6 A/dm~2、工作频率900 Hz、占空比10%,沉积时间30 min情况下制备氧化铝陶瓷涂层的稳定性、耐腐蚀性能。主要结果如下:在室温大气环境和90℃,相对湿度为90%的空气环境中有良好的稳定性,在3.5%NaC l水溶液中的腐蚀电流密度与贫铀基体相比降低了约2个数量级,显示了优异的耐腐蚀性能。
Preparation surface coating on uranium metal is one of effective methods to slow or even prevent its corrosion. In this paper, the cathodic micro-arc deposition method was used to prepare alumina ceramic coating on uranium surface. An optimized combination of parameters for preparing alumina ceramic coating on depleted uranium was proposed as follow: the sample surface roughness was of approximately Ra 0.10 μm; the aluminum nitrate concentration and stirring speed of electrolyte was of 1.0 mol/L and 200-300 r/min, respectively; the current density, operating frequency and duty cycle of power supply was of 6 A/dm~2, 900 Hz, and 10 %, respectively. Alumina ceramic coatings with proper microstructures and excellent bonding strength with uranium substrate were prepared under these combined parameters. These coatings showed good stabilities in atmosphere at ambient temperature and under temperature of 90℃ and relative humidity of 90 %, and an excellent corrosion resistance in 3.5 % NaCl solution, because the corrosion current density was of approximately two orders lower than that of uncoated depleted uranium sample.
Preparation surface coating on uranium metal is one of effective methods to slow or even prevent its corrosion. In this paper, the cathodic micro-arc deposition method was used to prepare alumina ceramic coating on uranium surface. An optimized combination of parameters for preparing alumina ceramic coating on depleted uranium was proposed as follow: the sample surface roughness was of approximately Ra 0.10 μm; the aluminum nitrate concentration and stirring speed of electrolyte was of 1.0 mol/L and 200-300 r/min, respectively; the current density, operating frequency and duty cycle of power supply was of 6 A/dm~2, 900 Hz, and 10 %, respectively. Alumina ceramic coatings with proper microstructures and excellent bonding strength with uranium substrate were prepared under these combined parameters. These coatings showed good stabilities in atmosphere at ambient temperature and under temperature of 90℃ and relative humidity of 90 %, and an excellent corrosion resistance in 3.5 % NaCl solution, because the corrosion current density was of approximately two orders lower than that of uncoated depleted uranium sample.
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