Advanced Materials Research Vol. 648

Abstract: Hot ductility in slab shell of two types of low Ni austenitic stainless steels was investigated via tensile test. Results showed that, reduction of area (RA) in Cr17Mn6Ni4Cu2N decreased gradually from surface to inside. However, RA in Cr15Mn9Cu2NiN shell surface was low, and increased from surface to inside. Analysis suggested that, the difference of RA between the two steels due to the different solidification process. In the shell of former steel, δ ferrite solidifies as the primary phase, then transforms into austenite. The space between primary arms increases from surface to inside, leading to the decrease of hot ductility. In the latter steel, δ ferrite does not solidify entirely as the primary phase because of the high cooling rate, but austenite solidifies directly from the retained liquid between δ ferrite dendrites. The change of solidification mode is most obviously in slab surface, which decreases its hot ductility.

Abstract: In this paper the corrosion inhibition of cetyl trimethyl ammonium bromide (CTAB) combined with sodium silicate on the Q235 and 316L steel were investigated. The results showed that CTAB has a higher corrosion inhibition rate but the cost is higher also. In order to lower the cost, the sodium silicate was combined with CTAB to be corrosion inhibitor. The Results showed that once the CTAB was combined with sodium silicate, there would be a synergistic effect between sodium silicate and CTAB. The corrosion inhibition rate could be greater than 80%. Especially when the concentration ratio of CTAB to sodium silicate was 0.02g/L:2.00g/L, the corrosion inhibition rate for the 316L and Q235 could be up to 87.04% and 91.03% respectively.

Abstract: In order to get an economical and high-efficiency corrosion inhibitor, in this paper the weight loss method were used to investigate the corrosion inhibition rate of the combined inhibitor. The thiourea, urotropine and Cetyltrimethyl Ammonium Bromide (CTAB) were combined each other. The results showed that double combined and triple combined inhibitor all had a high corrosion inhibition rate. Especially the thiourea combined with urotropine, whose concentration were 0.02 g/L and 0.08 g/L respectively, had a lowest cost and the corrosion inhibition rate was 91.22%.

Abstract: The epoxy cathodic electrodeposition (CED) coating modified by organic siloxane has been prepared. EP-44 resin was modified by aminosiloxane and organic amine, then to be neutralized with organic acid and emulsified in deionized water with blocked isocyanate as curing agent. The CED films were electrodeposited on tinplate, and the properties of the paint films were investigated. The results indicated that the films shown good performance.

Abstract: The oxidation of adrenaline (AD) using iron phthalocyanine encaged in Y zeolite (FePc/Y) as catalyst was investigated by UV-Vis spectroscopic analysis. The influence factors of catalytic efficiency, such as catalytic time and temperature, the pH value of solution and the amount of FePc/Y, have been investigated. The results indicated that AD could be effectively catalyzed by FePc/Y.

Abstract: The compound 1, (R,R)-N,N’-bis(benzaldehyde)-1,2-cyclohexanediamine schiff base was synthesized and characterized by 1H-NMR spectra, MS spectra and IR spectra. And the coordination reaction of 1 with nitrate of Cu (II) was studied. The reaction of 1 with CuII salt [Cu(NO3)2.2H2O] generates a new compound 2. The compound 2 was determined by IR spectra, elemental analysis and single-crystal X-ray diffraction. Crystal data for 2: space group P2(1)2(1)2(1) , with a= 9.632(12)Å, b = 9.706(12)Å, c = 22.04(3)Å, α=90.00 º,β=90.00 º , γ=90.00 º, Flack=0.02(3), Z=4, V= 2061(4) Å 3, Dc=1.457 mg.m-3, µ=1.109mm-1, F(000)=956. There are 6 coordination sites around Cu2+ of 2, which are respectively occupied by two oxygen atoms (all from two H2O) and four nitrogen atoms all from two cyclohexanediamine molecule. The Cu atom and four chelating nitrogen atoms are coplanar. There exist intra-molecular H-bond and intermolecular H-bond. The DNA binding behaviors of 2 has been examined by viscosity measurements, fluorescent spectroscopy, absorption spectra and cyclic voltammetric techniques. Results suggest that the compound 2 binds to DNA with a non-classical intercalative mode and static interaction mode. The observed efficient nuclease activity of the compound 2 is interesting and may have further influences in the chemistry of DNA binders.

Abstract: The title compound 1-Phenyl-3-(2-Hydroxyl–Phenyl)-5-(2,4-Chloro-Phenyl)-2-pyrazoline（C21H16Cl2N2O,Mr=383.26） was prepared from chalcone and phenylhydrazine. It was characterized by IR spectra, NMR spectra, MS spectra and X-Ray. The following crystal data was given: space group Pbca, with a=8.9678(7), b=14.1785(11), c=28.603(2)Å, β=90.00°, V=3636.8(5)nm3, Z=8, Dc=1.400mg/m3, μ=0.369mm-1, F(000)=1584, R=0.0492 and wR=0.1175. Found that there exist intramolecular H-bonds and the structure was one-dimensional lattice molecular. The inhibitory effects on EcMetAPof the title compound was determined and its inhibition was 31.62%. Its molecular field-based similarity analysis provided the necessary three-dimensional molecular field properties of the title compound to inhibit EcMetAP activities, and found that the EcMetAP inhibit-activities could be increased by addition electron donating groups at position 1,2 and 4 of pyrazole ring.

Abstract: The key factors for reflection loss of porous materials were studied mainly through experimentation. Regarded aggregate particles as polydisperse particles in porous concrete, by introducing Mie solution on scattering by a spherical particle, and combining with independent scattering discipline for polydisperse particles, a theoretical method for calculating microwave absorbing properties of porous concrete with aggregate diameter in logarithm normal distribution is presented, which can forecast the absorption properties of porous concrete preferably.

Abstract: The discontinuous transition of surface concentration due to the change of bulk concentration in isosteric/isothermal surface segregation has been discussed quantitatively according to the modified Darken model. The criteria for observing the discontinuous transition in surface segregation has been derived on the basis of the Bragg-William expression.