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Corrosion Behavior of Heat Treated nickel-aluminum Bronze Alloy in Artificial Seawater

Materials Sciences and Applications 2011年第11期2卷 1542-1555页

作者： Ashkan Vakilipour Takaloo Mohammad Reza Daroonparvar Mehdi Mazar Atabaki Kamran Mokhtar 不详

The effect of microstructure of nickel-aluminum bronze alloy (NAB) on the corrosion behavior in artificial seawater is studied using linear polarization, impedance and electrochemical noise tests. The alloy was heat treated in different heating cycles including quenching, normalizing and annealing. Microstructure of the specimens was characterized before and after heat treatment by optical microscopy and scanning electron microscopy. Results showed that the value of pearlite phase in the normalized alloy is much more than other specimens, leading to higher corrosion resistance. Polarization test showed that starting point of passivation in the polarization of the normalized alloy is lower than other specimens. The dissolution of Mn and Fe rich phases increased the Mn and Fe contents in solid solution, and this enhanced the passivation power of the surface of the alloy. The effect of the alloying elements was seen by a lower corrosion potential and an inflexion at around 280 mV (SCE) in the polarization curve, indicating the preferential dissolution of some elements beyond that potential. The polarization curve showed that the anodic polarization behavior of the alloy in the solution was essentially controlled by the intermetallic phases, mainly containing Cu. Two types of corrosion, pitting and selective corrosion, were observed in the specimens after being exposed to artificial seawater.

关键词： nickel-aluminum Bronze Alloy Heat Treatment Corrosion Microstructure

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Effect of Preparation Process on Compressive Strength and Hydrogenation Performance of Raney-Ni/Al2O3 Catalyst

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China Petroleum Processing & Petrochemical Technology 2017年第2期19卷 14-20页

作者： Luo Guohua Wang Yanli Sun Daming Xu Xin Jin Haibo College of Chemical Engineering Beijing Institute of Petrochemical Technology Beijing 102617 Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology Beijing 102617 Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of Technology Dalian 116024

In this study, Raney-Ni/Al_2O_3 catalysts were prepared from precursors which were calcined in different atmosphere(argon and air) and leached for different time. XRD, SEM, H_2-TPR and BET techniques were introduced to characterize the catalysts, and hydrogenation of unsaturated hydrocarbons, including vinyltoluene, dicyclopentadiene and indene, was used as probe reaction to evaluate the catalytic hydrogenation performance of the catalysts. The results demonstrated that the calcination atmosphere had noticeable effects on the compressive strength and hydrogenation performance of Raney-Ni/Al_2O_3. The catalyst calcined in argon exhibited better compressive strength and catalytic performance than the one calcined in air. The compressive strength and activity stability of catalyst were also determined by the leaching time. A too longer leaching time was not conducive to improving the compressive strength and catalytic performance of catalysts. When the precursor calcined in argon was treated in a 15%(by wt.) sodium hydroxide solution at 343 K for 5 h, a catalyst with higher compressive strength(at 26.10 N/mm) was obtained and the conversion of vinyltoluene, dicyclopentadiene(DCPD), and indene could amount to more than 87.5%, 99% and even 100%, respectively, under the reaction conditions covering a temperature of 493 K, a hydrogen pressure of 2.0 MPa, a LSHV of 3.0 h^(-1), and a hydrogen/oil ratio of 200:1.

关键词： nickel-aluminum alloy pseudo-boehmite unsaturated hydrocarbon hydrogenation

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