镍基惰性阳极的耐腐蚀性研究(下)

探讨Ni0—NiFe204基金属陶瓷惰性阳极在冰晶石——氧化铝熔体中的腐蚀行为，通过实验作出电解质分子比、电流密度及氧化铝浓度与腐蚀速率的关系曲线。针对该镍基惰性阳极，找出了该惰性阳极材料腐蚀速率较小时对应分子比，电流密度及氧化铝浓度等电解过程控制的较佳条件。     

金属储罐底板外侧阴极保护电位分布的数值模拟

采用混合控制的极化理论描述了阴极极化特性,利用数值计算软件模拟了5种辅助阳极埋设方式下罐底外侧的阴极保护电位分布,并对不同阳极埋设方式下电阻率和罐径对电位分布的影响进行了对比,为罐底阴极保护电位分布效果的判定和阳极布置方式的选择提供了依据.     

300kA预焙铝电解槽中修的可行性探讨

通过对300kA电解槽停槽后的炉底状况分析,表明大型预焙槽具备中修和二次启动的可行性。同时提出大型预焙电解槽具备中修的要求,为大型电解槽进一步延长槽寿命提供了新思路。     

Materials for global carbon dioxide recycling

CO₂ emissions, which induce global warming, increase with the development of economic activity. It is impossible to decrease the CO₂ emissions by suppression of the economic activity. Global CO₂ recycling can solve this problem. The global CO₂ recycling consists of three district: The electricity is generated by solar cells on deserts. At desert coasts, the electricity is used for H₂ production by seawater electrolysis and H₂ is used for CH₄ production by the reaction with CO₂. CH₄ which is the main component of liquefied natural gas is liquefied and transported to energy consuming districts where CO₂ is recovered, liquefied and transported to the desert coasts. A CO₂ recycling plant for substantiation of our idea has been built on the roof of the Institute for Materials Research in 1996. Key materials necessary for the global CO₂ recycling are the anode and cathode for seawater electrolysis and the catalyst for CO₂ conversion. All of them have been tailored by us. They have very high activity and selectivity for necessary reactions in addition to excellent durability. A pilot plant consisting of minimum units in an industrial scale is going to be built in three years.     

Effect of adding methods of metallic phase on microstructure and thermal shock resistance of Ni/（90NiFe2O4-10NiO） cermets

Ball mixing and electroless plating were respectively used as the adding methods of metallic phase to prepare Ni/（90NiFe2O4-10NiO） cermets for the inert anode in aluminum electrolysis. The microstructure and thermal shock resistance of cermet samples were studied. The results show that, for the samples prepared by ball mixing method, aggregation of metallic phase is found in either the green blocks or sintered samples and the extent of aggregation increases with the increase of metal content. For 6.5Ni/（90NiFe2O4-10NiO） cermets prepared with electroless plating method, the homogeneous and fine metallic particles are found in either the green compacts or sintered samples, but the relative density and thermal shock residual strength decrease by 3% and 28%-58% respectively, compared with samples prepared with ball mixing method.     

Zn─Fe合金镀层耐蚀性能研究

利用X-射线衍射和扫描电镜技术研究了纯Zn和Zn-Fe合金(含Fe0.2～0.7wt%)镀层的结构,发现Zn-Fe合金镀层的晶粒较纯Zn镀层细小,晶体排布更为致密;利用电化学综合测试仪研究了纯Zn和Zn-Fe合金镀层的极化电阻和腐蚀电流,结果表明Zn-Fe合金镀层的极化电阻更高而腐蚀电流较纯Zn镀层显著减小。     

微波热处理对La-Ni-Pt纳米合金催化剂性质的影响

采用改进的多元醇还原法以乙二醇为反应介质、聚乙烯吡咯烷酮（PVP）为保护剂、水合肼为还原剂，制备出了AB，型La—Ni—Pt纳米合金催化剂。同时采用了液相微波高温高压热处理对样品进行合金化处理。并采用XRD、TEM、SEM研究了其对样品的晶相结构和微观形貌的影响。测量结果表明，与传统的高温固相热处理相比，液相微波热处理能在较低的温度400-600％和较短的时间120s使样品合金化，同时并没有引起样品的晶粒和颗粒的明显长大。将微波热处理过的样品和未经微波热处理过的样品作为PEMFC阳极催化材料，进行电池性能比较，测试结果表明了经过微波热处理的样品其电催化性能得到较大的提高。     

潜油电泵机组牺牲阳极保护技术在印尼北区油田的应用

潜油电泵在印尼北区油田使用过程中遭受严重腐蚀,由井液资料分析了潜油电泵腐蚀的原因。提出了采用镁合金牺牲阳极的阴极保护方案对潜油电泵机组进行保护,设计了潜油电泵机组中电机和电泵的镁合金牺牲阳极保护装置,并在实际应用中取得了良好的保护效果。     

网状阳极在大型储罐底板阴极保护工程中的应用

文章介绍了网状阳极在茂名、湛江、岚山和上海地区的大型储罐阴极保护系统的应用情况。从实际运行的结果看,罐底板的保护电位都达到了设计要求和标准规定,保护电位分布相当均匀。保护电流密度也满足了设计要求。保护效果较好,表明网状阳极对于大型储罐的外底板的阴极保护是一种较好的解决方案。对于发现的几个问题也作了讨论。     

钢筋混凝土阴极保护用高性能涂层钛阳极

通过对传统钛阳极涂液的改性以及烧结工艺的改进,制备出Ru-Ti-Ir新涂层阳极。X射线衍射及扫描电镜分析表明,涂层氧化物晶粒细小、均匀、达到纳米级,涂层表面无龟裂纹。电化学测试分析表明,电极的电催化活性及强化寿命明显优于传统阳极,此电极在钢筋混凝土外加电流阴极保护中具有很好的使用效果。