Applied Mechanics and Materials Vols. 490-491

Abstract: Through the Suizhong 36-1 oilfield core acidification experiments, we studied the different acid systems on the dissolution rate of rock samples and determine the preferred suitable for different circumstances Suizhong 36-1 oilfield cuttings acid system^[1].

Abstract: The carbon dioxide corrosion inhibitor IMC-1 was composed by caprylic acid amide polyoxyethylene ethers (n=4-5) and a small amount of the TX-10(5%). When the concentration was 200 mg/L, N80 steel corrosion rate was less than 0.125mm/a. With the CO₂ partial pressure and temperature increased, N80 steel corrosion rate was decreased. From the electrochemical polarization curve, the adding corrosion inhibitor prevented the electrode reaction. The corrosion inhibitor IMC-1 was anodic inhibitor.

Abstract: The periodical filter cleaning process has a marked effect on the filtration performances of fabric filters. A model was proposed to express the non-uniformity of residual dust cake distribution after filter cleaning in a simpler manner, in which two parameters, i.e. the surface cleaning fraction, f , and the residual dust load on un-cleaned surface, R_D , were introduced. Three filter media with different surface finishing were tested and f and R_D were calculated by using the testing results. It can then be concluded that filter with surface finishing of calendar + singe has a better filter regeneration effect than that of singe + calendar. Lamination with PTFE membrane results in an excellent filter regeneration effect.

Abstract: The experimental ore belongs to high-sulfur Cu-Zn poly-metallic ore, the mineral composition of ore is complex, cupriferous pyrite most are disseminated. The Cu grade of raw ore is 0.76%, Zn grade is 1.48% and S about 25.02%. on the basis of best reagent system and control flotation time, the author did closed circuit process. the results of closed circuit process as follows: the copper concentrate grade is 20.35% and recovery rate is 86.081%; the zinc concentrate grade is 54.32% and recovery rate is 84.20%.

Abstract: In allusion to study of complex iron, manganese polymetallic ore,Fe has a grade of 14.28% while Mn 18.72% in the raw ore.According to process mineral research,condition tests research were carried on ,which got the the best grinding fineness of 85.7% -200mesh.The intensity of the weak magnetic field is 0.08T,while the strong is 0.6T.Based on the results of condition tests research and open line test,the flow sheet of low intensity magnetic separation-high intensity magnetic separation is recommended.We get the finally index through tests:the Fe grade of iron concentrate is 62.52% ,which has a recovery of 53.69%;the Mn grade of manganse concentrate is 32.25%,which has a recovery of 68.55%.

Abstract: This work reports the synthesis and evaluation of barakol tailored to become biodiesel fluorescent markers. Fluorescent markers for biodiesel fuels were synthesized from the reaction between barakol, which was obtained from the leaves and flowers of Cassia siame Lamk., with acid chloride in the presence of triethylamine. These synthetic fluorescent markers were 7-lauroyloxy-5-acetonyl-2-methylchromone, 7-butyryloxy-5-acetonyl-2-methylchromone and 7-(2-ethyl)-hexanoyloxy-5-acetonyl-2-methylchromone. These synthetic fluorescent markers were invisible color in biodiesel fuels when they were added into biodiesel and quantitative measurement was carried out using spectrofluorometer. All compounds gave fluorescence at 612 nm when they were excited at 464 nm. The testing results of fuel properties using the ASTM test methods revealed that the physical properties of the marked biodiesel fuels were similar to those of the unmarked biodiesel fuels. Moreover, those synthetic fluorescent markers were found to be stable in diesel fuels for at least three months at a concentration of 4 ppm.

Abstract: A model of crystal detachment from a chilling solid surface with vibration has been presented according to the mechanical analysis of the primary phase of a growing crystal grain. The model indicates that the main factors of crystal detachment are vibration frequency and amplitude as well as cooling temperature of the chilling solid surface. The effects of the above three factors on the actual crystal detachment behaviors were studied experimentally by using a transparent NH₄Cl-70%wtH₂O alloy. The consistency between the experimental results and theoretical study proves the mechanical model.

Abstract: Cr-Pr coating was prepared by electrodeposition method. The microhardness, wear weight loss and friction coefficient of Cr-Pr coating were studied respectively. The Cr-Pr coating were characterized with ICP-AES, EDAX, XRD and SEM techniques, respectively. The microhardness and the wear weight loss, friction coefficient of the Cr-Pr coatings are higher and lower respectively than that of the Cr coating. The microhardness of the Cr-Pr is as high as 805.2 HV, which is higher 3.74% than that of the Cr coating (776.2 HV). The wear weight loss of Cr-Pr is lower 1.33 times than that of Cr coating. The friction coefficient of Cr coating and Cr-Pr coating are 0.884 and 0.723 respectively. There are crystalline CrC in Cr-Pr coating. The nodules on Cr-Pr coating surface are smaller than that of Cr coating surface, and furrows and spalling are lower on the worn surface of Cr-Pr coating than that of the Cr coating.

Abstract: Ultra high strength strapping flat steel is used in packaging for papermaking, tobacco, compressed cotton and wool. At present, there is only one company can produce it by Lead bath quenching line. In this paper, the feasibility to produce new ultra high strength strapping flat steel of which tensional strength is 1350 MPa and elongation is 12% by continuous annealing process was investigated. The experiment result of steelmaking, hot rolling, pickling, cold rolling and continues heat treatment showed, the steel could be got using new chemical composition. The microstructure and X-ray diffraction spectrum of the steel showed, the steel was strengthened and toughened by martensite and retained austenite. The effect of continues heat treatment on microstructure and mechanical properties was discussed.

Abstract: Z11A3M, Z6A3M, Z1.6A1.6M, and Z1A1M coating samples were prepared in HDPS by traditional continuous hot dipping method. The anti-corrosion ability of these coatings was determined by SST, polarization curve and electrochemical impedance. The corrosion products were analyzed by XRD. The surface and section microstructures were observed by SEM. The results showed, the corrosion resistance of 4 kinds of Zn-Al-Mg coated steel is 4 times as galvanized steel. The Zn-Al-Mg coated steel sheets can be self-cured. MgZn₂ and eutectic could be found in all ZAM coating. Zn/Al/Zn₂Mg eutectic can be found in all 4 kind of coatings. The reason for superior corrosion resistance of Zn-Al-Mg coated steel is the decomposition reaction of Zn₅(OH)₈Cl₂ which is retained by Mg. Thus the O₂ diffusing rate is lowered down. Mg acts as PH buffer and the Zn dissolving rate can be reduced. According the results, the application of Zn-Al-Mg coated steel sheets is forecasted.