本文研究比较了不同条件下的离子束混合对纯铁腐蚀性能的影响.阳极极化试验表明,各种剂量氮离子束轰击纯铁镀钛样品,在0.15M H_2SO_4水溶液中均发生理想的自钝化现象.因而氮离子束混合显著提高了纯铁的耐性性能.而氮离子束混合,没有提...本文研究比较了不同条件下的离子束混合对纯铁腐蚀性能的影响.阳极极化试验表明,各种剂量氮离子束轰击纯铁镀钛样品,在0.15M H_2SO_4水溶液中均发生理想的自钝化现象.因而氮离子束混合显著提高了纯铁的耐性性能.而氮离子束混合,没有提高纯铁镀钛样品的耐蚀性.XPS 和 X 光薄膜衍射仅分析表明,氮离子束轰击纯铁镀钛样品表面形成了均匀的 TiN 层.这是氮离子束混合样品耐蚀性显著提高的原因.展开更多
The relatedness between catalytic effect of activated carbon and passivation phenomenon during chalcopyrite bioleachingby mixed thermophilic Archaea culture(Acidianus brierleyi,Metallosphaera sedula,Acidianus manzaens...The relatedness between catalytic effect of activated carbon and passivation phenomenon during chalcopyrite bioleachingby mixed thermophilic Archaea culture(Acidianus brierleyi,Metallosphaera sedula,Acidianus manzaensis and Sulfolobusmetallicus)at65°C was studied.Leaching experiments showed that the addition of activated carbon could significantly promote thedissolution of chalcopyrite for both bioleaching and chemical leaching.The results of synchrotron-based X-ray diffraction,ironL-edge and sulfur K-edge X-ray absorption near edge structure spectroscopy indicated that activated carbon could change thetransition path of electrons through galvanic interactions to form more readily dissolved secondary mineral chalcocite at a low redoxpotential(?400mV)and then enhanced the copper dissolution.Jarosite accumulated immediately in the initial stage of bioleachingwith activated carbon but copper dissolution was not hindered.However,much jarosite precipitated on the surface of chalcopyrite inthe late stage of bioleaching,which might account for the decrease of copper dissolution rate.More elemental sulfur(S0)was alsodetected with additional activated carbon but the mixed thermophilic Archaea culture had a great sulfur oxidation activity,thus S0waseliminated and seemed to have no significant influence on the dissolution of chalcopyrite.展开更多
基金supported by the National Natural Science Foundation of China(51204080,51274108,21263007)Natural Science Foundation of Yunnan Province,China(2011FA009)+1 种基金Application Foundation Research of Yunnan Province,China(2011FZ020)Talents Cultivation Foundation of Kunming University of Science and Technology,China(14118441)~~
文摘本文研究比较了不同条件下的离子束混合对纯铁腐蚀性能的影响.阳极极化试验表明,各种剂量氮离子束轰击纯铁镀钛样品,在0.15M H_2SO_4水溶液中均发生理想的自钝化现象.因而氮离子束混合显著提高了纯铁的耐性性能.而氮离子束混合,没有提高纯铁镀钛样品的耐蚀性.XPS 和 X 光薄膜衍射仅分析表明,氮离子束轰击纯铁镀钛样品表面形成了均匀的 TiN 层.这是氮离子束混合样品耐蚀性显著提高的原因.
基金Project(51274257) supported by the National Natural Science Foundation of ChinaProject(U1232103) supported by the Joint Funds of National Natural Science Foundation of China and Large Scientific Facility Foundation of Chinese Academy of Sciences+1 种基金Project(VR-12419) supported by the Beijing Synchrotron Radiation Facility Public User Program,ChinaProject(15ssrf00924) supported by the Shanghai Institute of Applied Physics Open Fund of Shanghai Synchrotron Radiation Facility,China
文摘The relatedness between catalytic effect of activated carbon and passivation phenomenon during chalcopyrite bioleachingby mixed thermophilic Archaea culture(Acidianus brierleyi,Metallosphaera sedula,Acidianus manzaensis and Sulfolobusmetallicus)at65°C was studied.Leaching experiments showed that the addition of activated carbon could significantly promote thedissolution of chalcopyrite for both bioleaching and chemical leaching.The results of synchrotron-based X-ray diffraction,ironL-edge and sulfur K-edge X-ray absorption near edge structure spectroscopy indicated that activated carbon could change thetransition path of electrons through galvanic interactions to form more readily dissolved secondary mineral chalcocite at a low redoxpotential(?400mV)and then enhanced the copper dissolution.Jarosite accumulated immediately in the initial stage of bioleachingwith activated carbon but copper dissolution was not hindered.However,much jarosite precipitated on the surface of chalcopyrite inthe late stage of bioleaching,which might account for the decrease of copper dissolution rate.More elemental sulfur(S0)was alsodetected with additional activated carbon but the mixed thermophilic Archaea culture had a great sulfur oxidation activity,thus S0waseliminated and seemed to have no significant influence on the dissolution of chalcopyrite.
