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质,故可推测这3种分子离子峰分别是Cr(OH)3HCOOH,Cr(HCOOH)3·2H2O,Cr2(COOH)2· (OH-)22+·4H2O,显然后两种含量较低. 对2.1中硫酸铬,硫酸铁混合溶液与甲酸钠反应的溶液进行质谱分析,结果如图6所示. 由图6可知,硫酸铁,硫酸铬溶液与甲酸钠反应的产物,得到两种分子离子峰,其中230.0704与图6中的229.8391(Fe(HCOOH)3·2H2O)和图7中的229.8681 (Cr(HCOOH)3·2H2O)基本一致,结合2.1中结论可以推断主要是Fe(HCOOH)3·2H2O.而194.0422可能是由于Cr3+,Fe3+离子均与甲酸形成配合物,相互竞争所生成的某种多金属配合物. 基于紫外和质谱分析检测结果可以发现当铬铁共同存在时,铁优先于铬与甲酸钠发生络合作用,存在形态相对于铬发生较大改变. 图6 硫酸铁,硫酸铬混合溶液与甲......
in aluminum alloy [J]. International Journal of Fatigue, 2001, 23(sup1): 247-251. DOI: 10.1016/S0142-1123(01)00155-4. [36] BRANTLEY S L, EVANS B, HICKMAN S H, CRERAR D A. Healing of microcracks......
Trans. Nonferrous Met. Soc. China 29(2019) 1621-1630 Enhanced mechanical properties of lamellar Cu/Al composites processed via high-temperature accumulative roll bonding Lin WANG1,2, Qing-lin DU1,2...; accepted 10 June 2019 Abstract: Cu/Al multilayers were produced by high-temperature accumulative roll bonding (ARB) methods up to three passes. To achieve a high bonding strength, prior to ARB......
on a Panalytical X′Pert PRO equipped with Cu Kα radiation (λ=0.15406 nm) at 40 kV and 40 mA. Microstructure observation was carried out by a scanning electron microscope (SEM, FEI Nova Nano SEM 450). 3... besides the diffraction peak of Cu substrate. However, when the two samples were annealed in argon atmosphere, characteristic diffraction peaks denoting the monoclinic MoO2 (JCPDS01-078-1071......
Chang-ping. Environmental impact assessment of magnesium alloy automobile hub based on life cycle assessment [J]. Journal of Central South University, 2018, 25(8): 1870-1878. [18] YUE Qiang, WANG He-ming......
Processing Technology, 2017, 250: 304-312. [3] Cheng J, Li F, Zhu S Y, Yu Y, Qiao Z H, Yang J. Electrochemical corrosion and tribological evaluation of TiAl alloy for marine application [J......
to tension gradient. The force caused slag film to flow up along prism. In addition, the relationship between the solubility of solid sample in melt and the curvature radius was as follows [15]: (5) where cr... study on the high temperature corrosion of TP347H stainless steel, C22 alloy and laser-cladding C22 coating in molten chloride salts [J]. Corrosion Science, 2014, 83(6): 396-408. [10] WANG Hui-jun......
the Archimedes method. The phases were analyzed using an X-ray diffraction (XRD) analyzer (Rigaku Ltd., Japan; Cu Kα radiation). Flexural strength was evaluated by a three-point bending test (Instron-3369...: 123-126. [12] TONG Yong-gang, BAI Shu-xin, YE Yi-cong, ZHANG Hong, YANG Zhen-huan. Reactive melt infiltration of a ZrB2 modified C/ZrC composite by a eutectic Zr-B alloy [J]. Materials Letters, 2015, 138......
required for wide application in the alloy production and galvanization industries [1]. At present, zinc is mainly produced from zinc sulfide minerals. However, with the depletion of these sulfide ores, more......
of an aluminum alloy using the multi- stage incremental process of a varying wall angle conical and pyramid frustum test. CRISTINO et al [6] conducted an experimental investigation on the multi-stage single... is performed from the same point. Fig. 5 Engineering stress-strain curve for Cu C11000 Fig. 6 Front (a) and side (b) views of formed product Fig. 7 Formed samples with various input parameters A thickness......
