In this paper,the formation process,morphology,and electrochemical performance of PEO coatings on AM50 magnesium alloy prepared in low concentration phosphate,aluminate,and phosphate-aluminate electrolytes were system...In this paper,the formation process,morphology,and electrochemical performance of PEO coatings on AM50 magnesium alloy prepared in low concentration phosphate,aluminate,and phosphate-aluminate electrolytes were systematically studied.The results show that the coatings prepared from the phosphate electrolytes have a higher thickness and better corrosion resistance properties compared to the other electrolytes.The coatings prepared from low concentration phosphate-aluminate mixed electrolytes have slightly thinner thickness,a similar coating structure and an order of magnitude lower value of electrochemical impedance compared with phosphate electrolyte coatings.The Coatings prepared from low concentration aluminate electrolytes have the lowest thickness and the worst corrosion resistance properties which gets close to corrosion behavior of the bare AM50 under the same test conditions.Considering application,coatings prepared from single low concentration phosphate electrolytes and low concentration phosphate-aluminate electrolytes have greater potential than single low concentration aluminate coatings.However,reducing the electrolyte concentrations of coating forming ions too much has negative influence on the coating growth rate.展开更多
随着某高镍锍中一次合金的粒度逐渐变细,大量的微细粒一次合金基本解离后进入了分级溢流,并在浮选分离铜镍过程中富集于二次镍精矿,导致原从二段分级返砂中弱磁选回收一次合金的工艺越来越不适应新的情况。要实现高镍锍中一次合金的充...随着某高镍锍中一次合金的粒度逐渐变细,大量的微细粒一次合金基本解离后进入了分级溢流,并在浮选分离铜镍过程中富集于二次镍精矿,导致原从二段分级返砂中弱磁选回收一次合金的工艺越来越不适应新的情况。要实现高镍锍中一次合金的充分回收,就必须对二次镍精矿中的细粒一次合金进行回收。在对二次镍精矿性质分析的基础上进行了弱磁选工艺条件研究。结果表明:(1)该二次镍精矿中的主要元素为Ni,其他有价元素为Cu、Co、Pt、Pd、Au等,主要矿物为硫镍矿、斑铜矿、铜铁镍合金;Pt、Pd、Au等贵金属绝大部分富集在铜铁镍合金中;各主要矿物的粒度均较细,硫镍矿的单体解离度最高,斑铜矿次之,铜铁镍合金的单体解离度为35.23%,54.26%与硫镍矿连生;(2)采用JCTN型永磁筒式磁选机,在不磨矿、磁场强度为320 k A/m、漂洗水量5 m3/h、漂洗水道数为6道、磁滚筒筒表转速为1 m/s情况下进行1次弱磁选,可获得S含量为14.76%,Pt、Pd、Au回收率分别为85.21%、75.74%、76.05%的一次合金;(3)对二次镍精矿中微细粒一次合金进行回收,也是对嵌布其中的贵金属的回收,可为企业创造显著的经济效益。展开更多
基金China Scholarship Council for the award of fellowship and funding(No.202006370022).
文摘In this paper,the formation process,morphology,and electrochemical performance of PEO coatings on AM50 magnesium alloy prepared in low concentration phosphate,aluminate,and phosphate-aluminate electrolytes were systematically studied.The results show that the coatings prepared from the phosphate electrolytes have a higher thickness and better corrosion resistance properties compared to the other electrolytes.The coatings prepared from low concentration phosphate-aluminate mixed electrolytes have slightly thinner thickness,a similar coating structure and an order of magnitude lower value of electrochemical impedance compared with phosphate electrolyte coatings.The Coatings prepared from low concentration aluminate electrolytes have the lowest thickness and the worst corrosion resistance properties which gets close to corrosion behavior of the bare AM50 under the same test conditions.Considering application,coatings prepared from single low concentration phosphate electrolytes and low concentration phosphate-aluminate electrolytes have greater potential than single low concentration aluminate coatings.However,reducing the electrolyte concentrations of coating forming ions too much has negative influence on the coating growth rate.
文摘随着某高镍锍中一次合金的粒度逐渐变细,大量的微细粒一次合金基本解离后进入了分级溢流,并在浮选分离铜镍过程中富集于二次镍精矿,导致原从二段分级返砂中弱磁选回收一次合金的工艺越来越不适应新的情况。要实现高镍锍中一次合金的充分回收,就必须对二次镍精矿中的细粒一次合金进行回收。在对二次镍精矿性质分析的基础上进行了弱磁选工艺条件研究。结果表明:(1)该二次镍精矿中的主要元素为Ni,其他有价元素为Cu、Co、Pt、Pd、Au等,主要矿物为硫镍矿、斑铜矿、铜铁镍合金;Pt、Pd、Au等贵金属绝大部分富集在铜铁镍合金中;各主要矿物的粒度均较细,硫镍矿的单体解离度最高,斑铜矿次之,铜铁镍合金的单体解离度为35.23%,54.26%与硫镍矿连生;(2)采用JCTN型永磁筒式磁选机,在不磨矿、磁场强度为320 k A/m、漂洗水量5 m3/h、漂洗水道数为6道、磁滚筒筒表转速为1 m/s情况下进行1次弱磁选,可获得S含量为14.76%,Pt、Pd、Au回收率分别为85.21%、75.74%、76.05%的一次合金;(3)对二次镍精矿中微细粒一次合金进行回收,也是对嵌布其中的贵金属的回收,可为企业创造显著的经济效益。
