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preferentially from chalcopyrite surface during bioleaching. The copper extraction is low, resulting from the formation of a passivation layer on the surface of chalcopyrite. The major component of the passivation layer that blocked continuous copper extraction is sulfur instead of jarosite. Key words: chalcopyrite; Leptospirillum ferriphilum; surface properties; passivation layer 1 Introduction Chalcopyrite......
Anodic passivation of Pb-Ag-Nd anode in fluoride-containing H2SO4 solutionZHONG Xiao-cong(钟晓聪), JIANG Liang-xing(蒋良兴), LIU Fang-yang(刘芳洋), LI Jie(李劼), LIU Ye-xiang(刘业翔) (School of Metallurgy... H2SO4 solution. The passivation reaction of Pb-Ag-Nd anode during pre-treatment process was investigated using cyclic voltammetry, linear scanning voltammetry, environmental scanning electron microscopy......
Passivation process of X80 pipeline steel in bicarbonate solutionsJian-long Zhou1), Xiao-gang Li1), Cui-wei Du1), Ying Pan2), Tao Li 3), and Qian Liu1) 1) School of Materials Science and Engineering... University of Science and Technology, Baotou 014010, China摘 要:The passivation process of X80 pipeline steel in bicarbonate solutions was investigated using......
Corrosion action and passivation mechanism of magnesium alloy in fluoride solution LI Jian-zhong(李建中)1, 2, HUANG Jiu-gui(黄久贵)2, TIAN Yan-wen(田彦文)1, LIU Chang-sheng(刘常升)1 1. School of Metallurgy... of Mg/F on the magnesium alloy surface is fixed at 11.3?1. The activated magnesium alloy gains a ‘passivation state’ in a mixture of sulfuric acid and hydrofluoric acid at a volume ratio of less than......
文献标识码:A Trivalent chromium passivation based on zincate plating ZENG Zhen-ou1, ZOU Jin-guang1, ZHAO Guo-peng2, XIAO Zheng-wei1 (1.College of Chemistry, South... and forming process of trivalent chromium passivation film were studied by electrochemical methods, scanning electron microscopy and X-ray photoelectron spectroscopy. The trivalent chromium passivation film......
higher and the donor density is slightly lower than that of the CG sample. Key words: stainless steel; Fe-Ni-Cr; polarization; acid corrosion; passivation 1 Introduction The application of stainless steel... as compared with the CG counterpart, indicating that UFG structure weakens the passivation ability of Fe-Cr-Ni alloy. Fig. 2 Potentiodynamic polarization curves for UFG Fe-Ni-Cr alloy and CG counterpart......
Trans. Nonferrous Met. Soc. China 22(2012) 2255-2260 Control method of chalcopyrite passivation in bioleaching PAN Hao-dan1, YANG Hong-ying1, TONG Lin-lin1, ZHONG Cong-bin2, ZHAO Yu-shan3 1. School..., Northeastern University, Shenyang 110819, China Received 5 April 2012; accepted 26 June 2012 Abstract: Passivation is a common phenomenon on the surface of chalcopyrite in the process of bioleaching......
of nitric acid passivation was investigated to enhance the general corrosion resistance of biomedical high-nitrogen nickel-free stainless steels(HNSs).After passivation,the corrosion rate of HNS could......
Alternating Pulse Current in Eiectrocoagulation for Wastewater Treatment to Prevent the Passivation of Al ElectrodeMAO Xuhui~1 HONG Song~(1*) ZHU Hua~1 LIN Hui~1 WEI Lin~1 GAN Fuxing~(1,2) (1.School...="ChDivSummary" name="ChDivSummary"><正>A novel current feed style,alternating pulse current,was proposed in electrocoagulation aiming at preventing the passivation of electrode materials.The open......
Comparative study on the passivation layers of copper sulphide minerals during bioleachingKai-bin Fu 1,2),Hai Lin 1),Xiao-lan Mo 1),Han Wang 1),Hong-wei Wen 1),and Zi-long Wen 1) 1) School of Civil... is cracked.The compact surface layer of porphyry chalcopyrite may strongly hinder copper extraction.X-ray photoelectron spectroscopy(XPS) further confirms that the passivation layers of covellite,pyritic......