共查询到20条相似文献,搜索用时 62 毫秒
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测定了Fe/H2SO4,Fe/H2SO4+Na2SO4,Fe/HSO4+Fe2(SO4)3和Fe/H2SO4+NaCl种体系在磁场或/和缓蚀剂作用下的极化曲线,指出腐蚀的主要控制是阴极过程,H2SO4中加入少量Na2SO4不影响其结果,但加入Fe2(SO4)3,NaCl会因Fe^3+,Cl^-的作用而影响结果,分析了磁场、缓蚀剂、Cl^-和Fe^3+单一和联合对Fe/H2SO4阴极和阳极极化行为的 相似文献
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生产电解二氧化锰用钛合金阳极的抗钝化性能 总被引:2,自引:0,他引:2
研究了Ti-1.5Ni、Ti-0.5Fe、Ti-1.5Ni-0.5Cu、Ti-1.5Ni-0.5Fe-0.3Cu4种合金在95℃,40g/L H2SO4+80g/L MnSO4电解二氧化锰溶液中作阳极时的抗钝化性能。研究表明:以上4种合金都具有比TA2优异的抗钝化性能,TiNiFe的最为优异,在电流密度低于80A/m^2时,阳极表面不生成氧化膜,析出相Ti2Ni对提高抗钝化性起关键作用。TiNiF 相似文献
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冷拔钢管磷化液中Fe~(2+)的抑制 总被引:1,自引:0,他引:1
分析了冷拔钢管磷化液中Fe~(2+)的危害及其产生原因,介绍了抑制Fe~(2+)的机理。进行了NaClO_3抑制磷化液中Fe~(2+)的试验,结果表明,按0.5g/L添加NaClO_3,可获得较好的抑制效果和经济效益。同时介绍了操作要点。 相似文献
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张林 《有色金属与稀土应用》1995,(3):43-45,18
采用HNO3(1+1)溶解金属镉后,加入50g/L的Fe(NO3)3溶液2.0mL,滴加氨水至Fe(OH)3沉淀完全,使铅生成Pb(OH)2与铁共沉淀。溶于HCl-NaAc溶液中,加入0.5g VC定容关于Ep=-0.3V(VS.S.C.E)起,进行极谱导数波测定。该结果准确可靠,方法也较简便。对批样分析,取得了满意的结果。 相似文献
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A3钢在含Fe~(3+)的盐酸溶液中的脆断机理 总被引:3,自引:0,他引:3
应用原子氢渗透速率测量传感器测定了在5%HCl溶液中添加不同含量的Fe(3+)时体系渗氢水平(渗氢电流)的变化;采用慢应变速率拉伸(SSRT)试验研究了A3钢在5%HCl+Fe(3+)溶液中于阴、阳极极化电位下的脆断敏感性及其断裂机制.结果表明,随着溶液中Fe(3+)含量的增加,渗氢水平逐渐下降;A3钢在溶液中的脆性系数(F%)随Fe(3+)含量变化曲线上出现一个极小值;在含0.01%Fe(3+)的盐酸溶液中,阴极极化使F%增大,阳极极化则使F%减小;而在含0.3%Fe(3+)的盐酸溶液中,极化的作用相反.结合断口的SEM照片分析,认为5%HCl溶液中Fe(3+)含量的增加,使得A3钢在该溶液中的断裂由氢致开裂机制向阳极溶解机制转变. 相似文献
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朱雪梅 《腐蚀科学与防护技术》1996,8(1):38-42
采用阳极极化测量,俄歇能谱仪与X射线光电子谱仪研究了Fe-(17 ̄31wt%)Mn-(0 ̄9wt%)Al系奥氏体合金在1mol/L Na2SO4与3.5%NaCl溶液中的电化学腐蚀行为。 相似文献
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应用原子氢渗透速率测量传感器测定了在5%HCl溶液中添加不同含量的Fe^3+时体系渗氢水平(渗氢电流)的变化;采用慢应变速率拉伸(SSRT)试验研究了A3钢在5%HCl+Fe^3+溶液中于阴、阳极极化电位下的脆断敏感性及其断裂机制。结果表明,随着溶液中Fe^3+含量的增加,渗氢水平逐渐下降;A3钢在溶液中的脆性系数(F%)随Fe^3+含量变化曲线上出现一个极小值;在含0.01%Fe^3+的盐酸溶液 相似文献
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含钒FeNiCr合金在0.4%H2SH27%CO2和1%H2SH27%CO2气氛中于600℃下的腐蚀产物包括外层疏松多孔、呈粉状的(Ni,Fe)S,其下致密的FeCr2S4和里层的Cr3S4。1%H2S气体中腐蚀,FeCr2S4的上部还有(Fe,Ni)S块的形成。钒与镍富集于FeCr2S4/Cr3S4交界处。 相似文献
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研究了铜电解液中高含量铜的光度分析。直接利用水合铜离子的蓝色,双波长扣除试样浑浊干扰;标样以硫酸为介质消除硫酸根干扰;于标样中加入定量的镍,并选择适当的波长克服镍的干扰。实现了贵溪冶炼厂铜电解液中铜(30~60g/L)的自动快速分析,240次进样/h,结果令人满意 相似文献
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黄天增 《有色金属再生与利用》2006,(7):23-25
杂铜中多余的镍作为有害杂质在阳极炉彻底氧化造渣除去,以确保阳极铜在电解时获得满意的阴极铜;造成了大量的镍白白损失。能否将这部分镍在保证阴极铜质量的情况下合理地回收回来,成为本项目研究的焦点。 相似文献
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采用热重分析仪和扫描电镜研究了不同加热温度和升温速率下Ni/Cu比为0.39的低Ni/Cu比含铜钢铜富集行为。研究结果表明:在1050~1300℃加热温度范围内,富集相以富Cu-Ni相和富Ni相为主,且以颗粒形式弥散分布于氧化皮内部或氧化皮与钢基体界面;除1250℃外,随加热温度升高,富集相中Ni/Cu比值逐渐增加,在1200℃和1300℃时,富集相仅为富Ni相。加热温度为1250℃时,升温速率不同,富集相的Ni/Cu比值和氧化皮与钢基体界面形态不同:采用5℃/min低速升温和15℃/min高速升温均有利于增加Ni/Cu比值,而采用10℃/min中速升温导致Ni/Cu比值偏低;增加升温速率,缩短加热时间,使氧化皮与钢基体界面更加平滑,有利于除鳞以改善钢材表面质量。对生产高表面质量低Ni/Cu比含铜钢而言,可采取低温加热或高温加热,将加热温度分别控制在1180~1220℃或者1280~1320℃;也可采用1220~1280℃中温加热,将弱氧化性气氛下分阶段步进梁加热炉的第三阶段升温速率控制在15℃/min左右。 相似文献
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Copper hydrometallurgy——current status, preliminary economics, future direction and positioning versus smelting 总被引:1,自引:0,他引:1
J.Peacey GUOXian-jian E.Robles 《中国有色金属学会会刊》2004,14(3):560-568
The heap leaching of oxide copper ores with copper cathode recovery by solvent extraction and electro-winning is now well established as a low-cost method of copper recovery. This technology has recently been applied successfully to mixed oxide and chalcocite ores, notably in Chile at Cerro Colorado, Quebrada Blanca and Zaldivar.Currently, there are significant development efforts underway to try to extend heap leaching to chalcopyrite ores.The success of heap leaching/SX/EW has also led to a revival in the development of hydrometallurgical processes to recover copper from chalcopyrite and other copper concentrates. The current status of copper hydrometallurgy is re-viewed and the most commercially attractive potential applications are explored. The advantages and disadvantages of the hydrometallurgical treatment of chalcopyrite concentrates and its preliminary economics are compared with those for the current best practices in copper smelting and refining. 相似文献
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The influence of shorting circuitry attachment between metal-oxide and oxideoxygen interfaces on the oxidation kinetics of copper, lithium-doped copper (Li: 400 ppm), and chromium-doped copper (Cr: 12 ppm) have been studied in dry air
in the temperature range of 523–1073 K. Oxide film or scale growth under short-circuiting as well as under normal oxidation conditions conforms to the parabolic rate law. The oxidation kinetics under short-circuiting resulted in decreased rates for Cu and Li-doped Cu up to a temperature of 773 K, while Cr-doped Cu exhibited an enhancement in rate compared to its normal oxidation in the same temperature range. However, above 873 K, all three systems under shorting circuitry attachment exhibited enhanced rates compared to their normal oxidation rates in conformity to the existing theoretical model. Use of additional resistances in series in the outer short-circuit Pt path have clearly established that below 773 K Mott's fieldinduced migration plays the most important role, while at elevated temperatures Wagner's electrochemical potential-gradient factor acts as the main driving force in the scale-growth process. The results have been interpreted on the basis of average defect concentration, the electrochemical potential gradient, electrical field gradient, and transport coefficient in the Cu2O layer. 相似文献