摘要
AZ31B镁合金废片-盐水体系能同时产生氢气和Mg(OH)2,研究了催化剂,Cl-浓度和反应温度对该体系产氢速率的影响,并分析了产物Mg(OH)2的化学成分和形态结构。实验结果表明,与Cu Cl2相比,铜线作为催化剂不仅产氢的速率高,且不会污染形成的Mg(OH)2。Cl-浓度和反应温度影响对体系产氢速率有较大影响,当温度为60℃,盐水浓度为4 mol/L时产氢速率达到最大值为62 m L/(min·g)。采用扫描电镜、X射线能谱仪表征分析中间产物,探讨Cl-点蚀反应的机理,对产物氢氧化镁粉末进行表征和物相分析的结果表明,产物为高纯度Mg(OH)2纳米材料,其晶体结构和分散性随温度的增加变好,80℃下获得规整的六方晶体。
Hydrogen gas and Mg（ OH）2can be simultaneously produced from the AZ31 B magnesium alloy scrap-salt system,and the effects of the catalyst,Cl^-concentration,and reaction temperature on the formation rate of hydrogen,as well as the chemical composition and morphology of the formed Mg（ OH）2,were investigated. It was found that,compared to Cu Cl2,the use of Cu wire as a catalyst not only resulted in a high formation rate of hydrogen but also did not lead to contamination of the formed Mg（ OH）2. Our results also showed that both the Cl^-concentration and reaction temperature had an impact on the hydrogen formation,and the production rate of hydrogen reached a maximum value at a Cl^-concentration of 4 mol / L and a temperature of 60 ℃.The formed Mg（ OH）2powder was nanosized and of high purity. The crystallinity of Mg（ OH）2increased with the reaction temperature,and hexagon-shaped crystals could be formed at 80 ℃. The reaction mechanism based on the pitting corrosion was also discussed in terms of both scanning electron microscopy（ SEM） and energy-dispersive spectroscopy（ EDS） results.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第3期1432-1437,共6页
Chinese Journal of Environmental Engineering
基金
浙江省自然科学基金资助项目(LY12B07011)
关键词
镁合金废料
CL^-浓度
产氢速率
点蚀
氢氧化镁
AZ31B magnesium alloy scrap
Cl^-concentration
hydrogen production rate
pitting corro sion
magnesium hydroxide
作者简介
厉雄峰（1989-），男，硕士，研究方向：固废处理与资源化。E—mail：lixiongfeng89@163．com
通讯联系人，E—mail：x．w．huang@163．com
