A Study of Surface Treatment on LY12 Aluminum Alloy by γ-APS

2009 ◽  
Vol 79-82 ◽  
pp. 1891-1894
Author(s):  
Dong Sheng Xia ◽  
Yu Zhou Gao ◽  
Hui Chen Zhang ◽  
Yan Yu
Keyword(s):  
Aluminum Alloy ◽  
Process Parameters ◽  
Electrochemical Impedance ◽  
Solution Concentration ◽  
Dip Coating ◽  
Curing Temperature ◽  
Optimum Process ◽  
Process Conditions ◽  
Water Mixture ◽  
Silane Treatment

The work aims to investigate the anti-corrosion behavior of silane treated LY12 aluminum alloy (AA LY12) and optimize the process conditions of silane treatment. The silane films were prepared on AA LY12 from γ-aminopropyltriethoxysilane (γ-APS) hydrolized in ethanol/water mixture by dip coating method. The optimum process parameters were obtained from the orthogonal designs in terms of silane solution concentration, ethanol/water ratio, dipping time, curing temperature and curing time. Prior and after silane treatment, the surface of AA LY12 was characterized by contact angle measurements and scan electron microscopy (SEM). The potentiodynamic polarization tests and electrochemical impedance spectroscopy measurements (EIS) were employed to study the anti-corrosion characteristics of silane films on AA LY12. The impedance plots were fitted with the different equivalent circuits. Furthermore, the influence of the above process parameters of silane treatment on film formation and anti-corrosion performance was explored. The results indicate that the γ-APS treated AA LY12 significantly improved the corrosion resistance, compared to the untreated one.

Evaluation of mechanical properties and surface roughness of cotton–viscose hybrid composite

2020 ◽  
pp. 096739112090905
Author(s):  
Kuppuraj Arunkumar ◽  
Angamuthu Murugarajan
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Composite Material ◽  
Process Parameters ◽  
Water Pressure ◽  
Machining Process ◽  
Optimum Process ◽  
Process Conditions ◽  
Machined Surface ◽  
Reinforced Composite

Natural-fibre reinforced composite material is an emerging material that has great potential to be used in various industrial aspects and applications. The cotton-viscose-reinforced composite is prepared using a compression moulding process. In addition to it, analysis of its mechanical properties was also carried out, such as tensile strength, flexural strength, impact strength and hardness. An attempt was made to process the prepared composite material using abrasive water jet machining (AWJM) under different process parameters (water pressure, nozzle transfer speed and abrasive flow rate) levels to determine the better suitable process conditions to achieve the better surface finish and optimize the machining process. The significance of the optimization process was ensured using the results of the analysis of variance. Morphological analyses of the machined surface were performed using a scanning electron microscope. The surface roughness of 8.28 µm was found to be the optimized process parameter. Optimum process parameters in AWJM are used to improve the surface quality.

Experimental Studies on Enriching Vanadium from Vanadium Tailings Carbon-Containing Pellets by EAF Melting

2012 ◽  
Vol 217-219 ◽  
pp. 776-779
Author(s):  
En Hui Wu ◽  
Shao Li Yang ◽  
Ping Huang ◽  
Jing Hou
Keyword(s):  
Process Parameters ◽  
Experimental Studies ◽  
Electric Arc ◽  
Orthogonal Test ◽  
Optimum Process ◽  
Process Conditions ◽  
Arc Furnace ◽  
Smelting Reduction ◽  
Experimental Scheme ◽  
Roasting Time

The process of smelting reduction by electric arc furnace was adopted to enriching vanadium to iron from vandium tailings,study the effect of vanadium recovery in the carbon-bearing pellet with different coal ratio、alkalinity and smelting time.Design experimental scheme using orthogonal test principle and experimental results was systematically analysed by the comprehensive methods of intuitive analysis and the optimum process parameters were determined. The optimized process conditions are obtained by one-factor at a time tests for recovery vanadium from vanadium tailings as follows: coal ratio of 12%, alkalinity of 1.5, roasting time of 15min.

Cu CONTAMINANT REMOVAL USING UV/O3 AND REMOTE HYDROGEN PLASMA

2002 ◽  
Vol 09 (01) ◽  
pp. 255-259 ◽  
Author(s):  
KYUNSUK CHOI ◽  
KWANG PYO HONG ◽  
CHONGMU LEE
Keyword(s):  
Exposure Time ◽  
Process Parameters ◽  
Hydrogen Plasma ◽  
Optimum Process ◽  
Process Conditions ◽  
Plasma Cleaning ◽  
Contaminant Removal ◽  
Cleaning Process ◽  
Cleaning Efficiency ◽  
X Ray

Removal of Cu contaminants from Si wafer was carried out using remote hydrogen plasma (RHP) and UV/O 3 cleaning techniques. The concentration of Cu impurities on the wafer surface was monitored by TXRF (total reflection X-ray fluorescence) and XPS (X-ray photoelectron spectroscopy). Our results show that Cu impurities can be effectively removed by hydrogen plasma and UV/O 3 cleaning techniques, if it is performed under optimum process conditions. The optimum process parameters for the remote hydrogen plasma cleaning are the rf power of 20 W and the exposure time of 5 min. The optimum exposure time of the UV/O 3 cleaning for Cu impurity removal is 1 min. A two-step cleaning process composed of remote hydrogen plasma cleaning first and UV/O 3 cleaning next has been found to be more effective than a single UV/O 3 cleaning process, a single remote hydrogen plasma cleaning process, or a two-step cleaning process composed of UV/O 3 cleaning first and remote hydrogen plasma cleaning next. Cleaning efficiency is maximized at optimum process conditions where Cu contaminant removal effect and recontamination effect are traded off. Increasing the process parameters higher than the optimum values would decrease the cleaning efficiency.

scholarly journals Experimental Study on Three-Dimensional Microstructure Copper Electroforming Based on 3D Printing Technology

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 887
Author(s):  
Yuanyuan Wu ◽  
Shuangqing Qian ◽  
Hua Zhang ◽  
Yong Zhang ◽  
Hongbei Cao ◽  
...  
Keyword(s):  
3D Printing ◽  
Process Parameters ◽  
Current Density ◽  
Three Dimensional ◽  
Machining Process ◽  
Optimum Process ◽  
Process Conditions ◽  
Influence Of Process Parameters ◽  
Printing Technology ◽  
3D Printing Technology

In order to fabricate three-dimensional metal microstructures, a combined machining process based on 3D printing technology and electroforming technology is proposed. Firstly, a substrate with microstructures is fabricated by 3D printing technology, and then the microstructures were fabricated by electroforming technology. The influence of process parameters such as current density, distance between electrodes and pulse current duty cycle on the electroformed layer were studied and analyzed. It was determined that the peak current density 6A/dm2, the void ratio 20%, and the distance between electrodes 40 mm were the optimum process conditions of electroforming experiment. The electroforming experiments of different microstructures were carried out with the optimum process parameters.

Preparation of Chitosan based Nanofibers: Optimization and Modeling

2016 ◽  
Vol 14 (1) ◽  
pp. 283-288 ◽  
Author(s):  
K. Thirugnanasambandham ◽  
V. Sivakumar
Keyword(s):  
Polymer Solution ◽  
Response Surface ◽  
Applied Voltage ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Interactive Effects ◽  
Optimum Process ◽  
Process Conditions ◽  
Good Correspondence ◽  
Nanofiber Diameter

AbstractThe main objective of the present study is to prepare a chitosan based nanofiber and model the electrospinning process using response surface methodology (RSM). The electrospinning parameters such as collector distance, polymer solution concentration and applied voltage were optimized by using three-variable-three-level Box–Behnken design (BBD). Based on RSM analysis, second order polynomial equation was formed and it indicated good correspondence between experimental and predicted values. 3D response surface plots were used to study the individual and interactive effects of process variables on chitosan based nanofiber diameter. The optimum process conditions for the minimum chitosan based nanofiber diameter (0.3 µm) were found to be collector distance of 12 cm, polymer solution concentration of 25% and applied voltage of 6 kV.

Using Fly Ash to Preparare Polysilicate Aluminum Ferric Flocculant and Treating Coal Slurry

2015 ◽  
Vol 1092-1093 ◽  
pp. 966-971
Author(s):  
Jian Li Yang ◽  
Mei Li Du ◽  
Gang Li
Keyword(s):  
Fly Ash ◽  
Orthogonal Experiment ◽  
Curing Temperature ◽  
Molar Ratio ◽  
Optimum Process ◽  
Process Conditions ◽  
Coal Slurry ◽  
Element Ratio ◽  
Silicon Iron ◽  
Aluminum Iron

Solid waste resource utilization is a important way for sustainable economic development, environmental and ecological protection. Using adsorption and flocculation characteristics of fly ash to preparare fly ash-based inorganic flocculant and use it for treating slime water, make waste fly ash into treasure, not only solve environmental problems, but also has very important theoretical significance and application value.In this study, we use Na2CO3 melt to improve acid-soluble activity of fly ash, extract ideally the aluminum and iron silicon as active ingredients in the fly ash. On the basis of the solubilization experiment, we design orthogonal experiment about larger impact several factors on the the flocculant preparation of process: silicon and aluminum element ratio, silicon iron element ratio and curing temperature, the orthogonal experiment results show that the best optimum process conditions is: Si: Al (mole ratio) is 1:0.5, Si: Fe (molar ratio) is 1:0.5, curing temperature is 60°C, curing time is 2 hours. Finally, we use poly silicate aluminum iron flocculants prepared to do flocculation test on slime water, determine the best flocculation conditions is: when we treat slime water which concentration is 8g/L and volume is 250mL, the optimum dosage of polysilicate aluminum iron is 1.3mL, the transmittance gets to 74.2%, the flocculation effect is the best.

Bitumen Modification

2014 ◽  
Vol 880 ◽  
pp. 3-6 ◽  
Author(s):  
Olga I. Slavgorodskaya ◽  
Vladimir G. Bondaletov ◽  
Yulia P. Ustimenko
Keyword(s):  
Process Parameters ◽  
Curing Temperature ◽  
Optimum Process ◽  
Properties Of Coatings ◽  
Bitumen Modification

The possibility of using epoxidized petroleum resins for modification of bitumen was shown. The dependence of the properties of coatings based on polymeric-bitumen compositions of the number of modifiers, hardening agent and the curing temperature was investigated. The optimum process parameters for polymeric-bitumen compositions were identified. The resistance of the coatings to different environments was investigated.

Study on Chlorine Bleaching-Washing of Denim Fabric under Ultrasonic Conditions

2015 ◽  
Vol 671 ◽  
pp. 202-209 ◽  
Author(s):  
Wen Qi Shi ◽  
Dan Ying Zuo ◽  
Yu Bo Chen ◽  
Chang Hai Yi
Keyword(s):  
Sodium Hypochlorite ◽  
Solution Concentration ◽  
Optimum Process ◽  
Process Conditions ◽  
Ultrasonic Power ◽  
Chlorine Bleaching ◽  
Structure Changes ◽  
Ultrasonic Assisted ◽  
Denim Fabric ◽  
Ultrasonic Conditions

The influences of the ultrasonic power, the processing time, temperature and sodium hypochlorite concentration on the bleaching-washing effect were analyzed based on the surface K/S value of denim fabric during the ultrasonic-assisted chlorine bleaching washing the denim. It was found that the ultrasonic collaborative sodium hypochlorite washing the denim with a better bleaching effect could save more energy than traditional stirring way. The optimum process followed as the ultrasonic power 400 w, the ultrasonic total times 20 min, the bleaching temperature 25°C and the solution concentration 5%. As well, the microscopic structure changes of denim fabric treated by two different kinds of chlorine bleaching washing way were investigated by SEM, FTIR and XRD under the optimal process conditions. The results showed the denim surface became more rough, no new functional groups produced and crystallinity increased.

scholarly journals Optimization of process conditions for microwave-assisted flax water retting by response surface methodology and evaluation of its fiber properties

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5859-5870
Author(s):  
Dan Zhao ◽  
Hairui Ji ◽  
Renpeng Du ◽  
Qi Wang ◽  
Wenxiang Ping ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Tensile Properties ◽  
Response Surface ◽  
Process Parameters ◽  
Microwave Power ◽  
Hot Water ◽  
Optimum Process ◽  
Process Conditions ◽  
Microwave Assisted ◽  
Microwave Assistance

Microwave-assistance was used to increase the degumming efficiency in flax water retting. Different pre-soaking times, microwave times, and microwave power were investigated in this study. The relationships between degumming rate and process parameters were established via response surface methodology (RSM). The optimum process parameters were a pre-soaking time of 25.5 h, a microwave time of 18.5 min, and a microwave power setting of 570 W. Under these optimal conditions, the degumming rate was 83.85% ± 1.13%, which was 1.33 times higher than that of natural hot water retting (P < 0.05). Moreover, the tensile properties and color of the resulting fibers showed that they had tensile properties similar to those of the natural hot water retting fibers. However, the color values for the natural hot water retting fibers were higher than those of the fibers treated with microwave-assisted flax water retting.

Optimization of Process Parameters for Fabrication of Wool Fiber-Reinforced Polypropylene Composites with Respect to Mechanical Properties

2014 ◽  
Vol 9 (3) ◽  
pp. 155892501400900 ◽  
Author(s):  
Rajkumar Govindaraju ◽  
Srinivasan Jagannathan ◽  
Mohanbharathi Chinnasamy ◽  
P. Kandhavadivu
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Compression Molding ◽  
Wool Fiber ◽  
Optimum Process ◽  
Process Conditions ◽  
Regression Equations ◽  
Fiber Reinforced ◽  
Polypropylene Composites ◽  
Optimization Of Process Parameters

The present study focused optimizing the process parameters of compression molding with respect to mechanical properties for fabrication of wool fiber-reinforced polypropylene composites. An experiment was designed using the Box-Behnken method with three levels and three variables using temperature, time, and pressure, as independent variables and tensile, flexural, and impact strengths as dependent variables. The process conditions were optimized using response surface methodology with the Box-Behnken experimental design. Regression equations were obtained to analyze tensile strength, flexural strength, and impact strength and the optimum process parameters were identified. The results show that the optimum conditions for compression molding are 176°C, 7 min, and 35 bar.

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