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of La9.83–x Sr x Si6O26+δ(0≤x≤0.50) precursors, intermediate and final products. The sintering reactions, the phase formation, the structure as well as the powders’ morphology were studied by means... and morphology as well as on intermediate and final products was reported. As was concluded pure La9.83Si6O26+δ, La9.38Sr0.45Si6O26+δ and La9.33Sr0.50Si6O26+δ could be prepared after sintering at 1400......
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. Surface corrosion products of Ni-Cr alloys were analyzed by photoelectron spectrograph after being immersed in 0% and 30% H2O2. The order of increasing surface roughness of Ni-Cr alloys after being... showed different degrees of corrosion. According to the XPS results, the corrosion products formed on the outmost surface layer of the studied samples are Ni(OH)2 and BeO. Key words: hydrogen peroxide......
三氯化铁浸出-重铬酸钾滴定法测定钛精粉还原产物中的金属铁李传维1,司新国1,鲁雄刚1,郭曙强1,丁伟中1(1.上海市上海大学上海市现代冶金与材料制备重点实验室)摘 要:试样用三氯化铁溶液溶解,金属铁被氧化为二氯化铁,过滤分离,滤液酸化后以二苯铵磺酸钠为指示剂,用重铬酸钾标准溶液滴定,实现了钛精粉还原产物中金属铁含量的测定.结果表明,试样粒度在0.125mm以下时,FeCl3溶液浓度和用量分别为10g/L和100mL,采用电磁搅拌60min为最佳的实验条件.分别用HgCl2分析法,矿相法对方法正确度进行检测,其中......
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is 13.8 mg/(g·h), higher than methanol 3.4 mg/(g·h), ethanol 10.2 mg/(g·h) at 25 ℃; compared with nitrifying sludge, the protein of soluble microbial products from denitrifying sludges increases...); extracellular polymeric substances; soluble microbial products 水体富营养化是导致水环境恶化的主要原因之一,其中氮,磷是水体富营养化的限制性元素.传统生物脱氮主要是通过硝化阶段将NH3转化为NO3--N,再由反硝化阶段将NO3--N转化为N2.在众多生物脱氮污水处理工艺当中,膜生物反应器(membrane bioreactor, MBR)脱氮工艺的效......
thickness increases gradually during the process. The element of S invades the substrate. The corrosion products mainly include Ni O,Ni3S2 and Cr2O3. The hot corrosion in molten salt makes the specimens rough and flawed. The serration grain boundaries are observed in the hot corroded specimens.The tensile strength and elongation of the original alloy are1023 MPa and 15 %, respectively. After corroded......
RESEARCH ON THE WATER-RESISTANCE OF MAGNESIUM OXYCHLORIDE CEMENT--I:THE STABILITY OF THE REACTION PRODUCTS OF MAGNESIUM OXYCHLORIDE CEMENT IN WATER张传镁,邓德华摘 要:<正>In this paper.the change of the crystalline phasesin hardened magnesium oxychloride cement(MOC)paste inwater was analyzed by XRD.It was developed that the reactionproducts 5 phase or 3......
, electrochemical impedance spectroscopy measurements and weight loss measurements.The corroded morphologies and the corrosion products are also investigated by scanning electron microscopy, X-ray... increases.The corrosion products are mainly composed of γ-FeOOH and Fe3O4 at the atmospheric pressure, while the main components are γ-FeOOH, Fe3O4, and γ-Fe2O3 at the high pressure.The hydrostatic......
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