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| 1 | DISSOLUTION THEORY OF GOLD IN ALKALINE THIOUREA SOLUTION(Ⅰ) Anodic Behavior on Gold in Alkaline Thiourea Solution Containing Na_2SO_3显示文摘INTRODUCTIONSincethioureawasutilizedasthelixiviantofgoldearlyin1932[1],extractinggoldfromoreorscrapbyacidicthioureasolutionha... | Chai Liyuan and Masazumi Okido Department of Nonferrous Metallurgy, Central South University of Technology, Changsha 410083, P. R.China Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya 464, Japan | 1999 | 中国有色金属学会会刊:英文版1999，9，1： | 10 |
| 2 | Dissolution theory of gold in alkaline thiourea solution(Ⅲ) ——Thermodynamics on dissolution of gold in alkaline thiourea solution containing Na _2SO_3显示文摘The oxidants of gold were investigated in an alkaline thiourea solution containing Na 2CO 3, in which Na 2S 2O 8 is a proper oxidant for dissolving gold because of in such homogeneous sulfur system coexisting complex agent, oxidant and stabilizing agent. The thermodynamic analyses were conducted on the dissolving of gold in the alkaline thiourea solution containing Na 2SO 3 by the oxidants oxygen or Na 2S 2O 8. The results show that the possibility of gold dissolution reduces with increasing pH value, while oxygen acts as oxidant; and when Na 2S 2O 8 acts as the oxidant of gold in the alkaline thiourea solution of pH 12.5, decomposition potential of thiourea decreases from the standard value 0.42 V to -0.32 V, also the dissolution trend of gold enhances with shifting the mix potential of the solution to the positive direction. | Chai Liyuan(柴立元) 1, Masazumi Okido 2 1. Department of Nonferrous Metallurgy, Central South University of Technology, Changsha 410083, P.R.China 2. Center for Integrated Research of Science and Engineering, Nagoya University,Nagoya 464, Japan | 1999 | 中国有色金属学会会刊:英文版1999，9，3： | 9 |
| 3 | SELECTIVE DISSOLUTION OF GOLD IN AN ALKALINETHIOUREA SOLUTION BY ELECTROLYSIS显示文摘Anodic polarization behavior of gold, silver, copper, nickel and iron in potentiostatic condition has been examined in an alkaline aqueous thiourea solution, where gold is hardly dissoluble normally. The addition of Na2SO3 into the solution can accelerate anodic dissolution of gold. The factors affecting selective dissolution of gold in the alkaline thiourea solution by electrolysis have been studied, and the optimum condition was obtained. In 0.1 mol/L thiourea solution of pH 12. 5 containing 0. 5 mol/L Na2SO3 and 2. 5% acetone, at the potential of 0. 34 V vs NHE, at the temperature of 323 K, the dissolved mass of gold anode with the exposed area of 1. 0 cm2 reached more than 300 mg·dm-3 within 30 min, and other metals such as silver, copper, nickel and iron could hardly dissolve. | Zhang Chuanfu Chai Liyuan Zhong Haiyun (Department of Nonferrous Metallurgy, Central South University of Technology, Changsha 410083, China)Masazumi Okido RyouichiIchino(center erforIntegratedResearchinScienceandEngineering NagoyaUniversity,Nagoya464,Ja | 1997 | Journal of Central South University1997，9，2： | 8 |
| 4 | 通过水溶液还原法用抗坏血酸制备纳米铜颗粒(英文)显示文摘通过水溶液还原法用抗坏血酸还原Cu2+制备纳米铜颗粒,并研究溶液pH和Cu2O平均粒径对纳米铜颗粒制备的影响。在溶液pH值为3、5和7时,可制得铜颗粒,并且在pH=7时制得的铜颗粒粒径最小。在溶液pH为9和11时无法制得铜颗粒。Cu2O的平均粒径能影响铜粉的粒径。Cu2O的平均粒径越大,得到的铜颗粒越大。通过对反应过程中不同时间点收集的样品进行XRD分析,可探索出反应的进程。在反应过程中,Cu(OH)2首先作为前驱体出现,然后被还原为Cu2O,最后被还原为铜颗粒。 | 刘清明 Takehiro YASUNAMI Kensuke KURUDA Masazumi OKIDO | 2012 | Transactions of Nonferrous Metals Society of China2012，22，9： | 6 |
| 5 | Improvement of corrosion resistance of AZ31 Mg alloy by anodizing with co-precipitation of cerium oxide显示文摘Anodizing of AZ31 Mg alloy in NaOH solution by co-precipitation of cerium oxide was investigated.The chemical composition and phase structure of the coating film were determined via optical microscopy,SEM and XRD.The corrosion properties of the anodic film were characterized by using potentiodynamic polarization curves in 17 mmol/L NaCl and 0.1 mol/L Na2SO4 solution at 298 K.The corrosion resistance of AZ31 magnesium alloy is significantly improved by adding cerium oxide to alkaline solution.In addition,the surface properties are enhanced and the film contains no crack. | Salah Abdelghany SALMAN Ryo ichi ICHINO Masazumi OKIDO | 2009 | 中国有色金属学会会刊:英文版2009，19，4： | 6 |
| 6 | Na_2SO_3加速碱性硫脲溶液溶金的机理初探显示文摘Na2SO3可以改善硫脲在碱性介质中的稳定性;增大金在其中的阳极极化。Na2SO3参与金在碱性硫脲溶液中阳极溶解的反应级数大于1,表明Na2SO3可以加速金在碱性硫脲溶液中的溶解,其原因被认为是电化学还原和催化作用。 | 柴立元 Masazumi Okido | 2001 | 湖南有色金属2001，17，2： | 5 |
| 7 | Surface characteristics of chemical conversion coating for Mg-Al alloy显示文摘The chemical conversion coating was formed on Mg alloy for low cost and harmlessness in environment by using the colloidal silica as the main component.The film formed at 298 K was thick,which was thought to be the combination of Si and O.In salt spray test,the ratio of black rust on the specimen that did not conducted chemical conversion treatment was five times or more than those of the chemical conversion treated specimen.The film of chemical conversion coating produced by alkali treatment process was thinner than the specimen produced in basic chemical conversion treatment solution. | Masazumi OKIDO Ryoichi ICHINO Seong-Jong KIM Seok-Ki JANG | 2009 | 中国有色金属学会会刊:英文版2009，19，4： | 2 |
| 8 | The electrochemical study on mechanical and hydrogen embrittlement properties of HAZ part as a function of post-weld heat treatment in SMAW 显示文摘 | KIM S J OKIDO M MOON K M | 2003 | Surface and Coatings Technology2003，，： | 1 |
| 9 | Endue neck surgery:current status for thyroid and partial diseases显示文摘 | Ohshima A Simizu S Okido M | 2002 | BiomedPharmacother2002，561，： | 1 |
| 10 | Video-assisted parathyroidectomy by a skin-lifting method for primary hyperparathyroidism显示文摘 | Okido M Shimizu S Kuroki S | 2001 | JSLS2001，5，2： | 1 |
| 11 | Anodizing of magnesium alloy AZ31 in alkaline solutions with silicate under continuous sparking显示文摘 | Liyuan Chai Xia Yu Zhihui Yang Yunyan Wang Masazumi Okido | 2008 | Corrosion Science2008，，12： | 1 |
| 12 | Endoscopic neck surgery:current status for thyroid and parathyroid diseases显示文摘 | Ohshima A Simizu S Okido M | 2002 | Biomed Pharamacother2002，56，1： | 1 |
| 13 | Anodizing of Mg alloys on alkaline solutions显示文摘 | MIZUTANI Y KIM S J ICHINO R OKIDO M | 2003 | Surface and Coatings Technology2003，，： | 1 |
| 14 | Formation of anodic films on Mg-Al alloys in NaOH solutions at constant potentials显示文摘 | KIM S J OKIDO M MIZUTANI Y ICHINO R TANIKAWA S HASEGAWA S | 2003 | Materials Transactions2003，44，5： | 1 |
| 15 | Characterization of the chemical conversion films that form on Mg-Al alloy in colloidal silica solution显示文摘 | KIM S J ZHOU Y ICHINO R OKIDO M TANIKAWA S | 2003 | Metals and Materials International2003，9，2： | 1 |
| 16 | Preparation of Cu nanopartic1es with ascorbic acid by aqueous solution reduction method显示文摘 | LIU Q M YASUNAMI T KURUDA K OKIDO M | 2012 | Transactions of Nonferrous Metal Society of China2012，22，9： | 1 |
| 17 | Characterization of silica conversion film formed on Zinc-electroplated steel显示文摘 | KIM S J HARA M ICHINO R OKIDO M WADA N | 2003 | Materials Transactions2003，44，4： | 1 |
| 18 | Endoscopic neck surgery : Current status for thyroid and parathyroid diseases 显示文摘 | Ohshima A Simizu S Okido M | 2002 | Biomed Pharmacother2002，56，： | 1 |
| 19 | Endoscopic neck surgery: current status for thyroid and parathyroid diseases显示文摘 | Ohshima A Simizu S Okido M | 2002 | Biomed Pharrnacother2002，561，： | 1 |
| 20 | Endoscopic neck surgery:current status for thyroid and parathyroid diseases显示文摘 | Ohshima A Simizu S Okido M | 2002 | Biomed Pharmacother2002，561，： | 1 |
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