scholarly journals OXIDATION KINETICS OF ALUMINUM ALLOY АЖ2.4М5.3МГ1.1Ц4КР3, ALLOYED WITH TIN, IN SOLID STATE

2021 ◽  
Vol 56 ◽  
pp. 17-22
Author(s):  
Orif Sh. Davlatov ◽  
◽  
Izatullo N. Ganiev ◽  
Haydar Odina Odinazoda ◽  
Safomudin S. Rajabaliev ◽  
...  
Keyword(s):  
Activation Energy ◽  
Aluminum Alloy ◽  
Weight Gain ◽  
Oxidation Kinetics ◽  
Oxidation Process ◽  
Thermogravimetric Method ◽  
Protective Properties ◽  
Initial Alloy ◽  
Kinetics Of ◽  
Improved Characteristics

The purpose of this work was to find out the features of oxidation of the aluminum alloy АЖ2.4М5.3Мг1.1Ц4Кр3 doped with tin and to develop new alloy compositions with improved characteristics. The thermogravimetric method was used to determine the oxidation kinetics of the aluminum alloy АЖ2.4М5.3Мг1.1Ц4Кр3, containing up to 0.5 wt% tin. The results showed that the process of weight gain of alloys during first 15-20 minutes of oxidation grows intensively, and then acquires an almost constant value. Oxide films formed at the beginning of the oxidation process did not possess protective properties, that fact explains an increase in the rate of oxidation of alloys with temperature in the first period. An increase in the rate of oxidation of alloy samples with temperature is noted. As well, the results revealed that tin at concentrations of 0.01 - 0.5 wt.% reduces the oxidability of the initial alloy, which is accompanied by an increase in the apparent activation energy from 82.1 to 104.3 kJ/mol.

scholarly journals OXIDATION KINETICS OF ALUMINUM ALLOY AK12M2, MODIFIED BY BARIUM, IN SOLID STATE

2020 ◽  
Vol 55 ◽  
pp. 28-33
Author(s):  
Izatuiio. N. Ganiev ◽  
◽  
Furkatshokh Sh. Zokirov ◽  
Murodali M. Sangov ◽  
Asadkul E. Berdiyev ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Solid State ◽  
Oxidation Kinetics ◽  
Alkaline Earth ◽  
Oxidation Process ◽  
Dominant Role ◽  
Alkaline Earth Metals ◽  
Protective Properties ◽  
Initial Alloy ◽  
Kinetics Of

The oxidation kinetics of the AK12M2 aluminum alloy modified to 1.0% by barium was studied using thermogravimetry method. It was shown that the addition of barium to the alloy and the increase in temperature increase the oxidation rate of the initial alloy in the solid state. The apparent activation energy of the oxidation process of the AK12M2 aluminum alloy is 127.73 kJ/mol and decreases to 71.85 kJ∕mol for the alloy with 1.0% barium. The oxidation curves of the AK12M2 aluminum alloy with barium in the solid state are described by polynomials indicating the hyperbolic mechanism of that process. The mechanism of influence of barium on the oxidability of the AK12M2 aluminum alloy was established. It lies in the fact that barium in the range of 0.3-1.0% plays a dominant role in the formation of an oxide film, which is characterized by low protective properties. Barium influence is explained by its physicochemical properties as one of the alkaline earth metals.

Study on Oxidation Kinetics of Catalytic Oxidation of Magnesium Sulfite

2011 ◽  
Vol 391-392 ◽  
pp. 1350-1353
Author(s):  
Tong Zhu ◽  
Xiao Yan Qi ◽  
Zhong Yuan Wang ◽  
Fang Yu ◽  
An An Liu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Reaction Kinetics ◽  
Oxidation Kinetics ◽  
Reaction Rate ◽  
Catalyst Concentration ◽  
Oxidation Process ◽  
Sulfate Concentration ◽  
Air Compressors ◽  
Kinetics Of ◽  
Temperature Time

This paper presented a study on the reaction kinetics of magnesium sulfite catalyzed by Catalyst TR. Used a Lib-scale Plexiglas reactor aerated by air compressors to research the oxidation process Influence by pH, catalyst concentration, aeration quantity, temperature, time, sulfate concentration. Through experiment concluded the activation energy, got the formula between reaction rate and sulfate concentration.

Modeling Investigation of the Oxidation Kinetics of Copper and Aluminum Alloys

2011 ◽  
Vol 402 ◽  
pp. 17-21 ◽  
Author(s):  
Feng Jin ◽  
Qun Luo ◽  
Biao Zhou ◽  
Qian Li
Keyword(s):  
Activation Energy ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Power Law ◽  
Oxidation Kinetics ◽  
Oxidation Rate ◽  
Calculation Results ◽  
Kinetics Of

The oxidation kinetics of copper or aluminum added with magnesium was investigated by a modified Chou model. The effect of the addition of magnesium in copper or aluminum was discussed. The calculation results showed that the activation energy of CuMg0.34 was the highest among Cu-Mg alloys at 600-900 °C, which indicated that it had the best oxidation resistance in all of the samples. The aluminum alloy AA3004 containing 1.0 wt.% Mg showed the better anti-oxide behavior than AA5182 with 4.0 wt.% Mg, and the relation between oxidation rate and oxygen partial pressure could be expressed as 0.71 times power law.

scholarly journals Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Pakamon Pintana ◽  
Nakorn Tippayawong
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Combustion Kinetics ◽  
Heating Rates ◽  
Thermogravimetric Method ◽  
Degradation Behaviors ◽  
Fwo Method ◽  
Free Cao ◽  
Kinetics Of

Thermal behaviors and combustion kinetics of Thai lignite with different SO3-free CaO contents were investigated. Nonisothermal thermogravimetric method was carried out under oxygen environment at heating rates of 10, 30, and 50°C min−1from ambient up to 1300°C. Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods were adopted to estimate the apparent activation energy (E) for the thermal decomposition of these coals. Different thermal degradation behaviors were observed in lignites with low (14%) and high (42%) CaO content. Activation energy of the lignite combustion was found to vary with the conversion fraction. In comparison with the KAS method, higherEvalues were obtained by the FWO method for all conversions considered. High CaO lignite was observed to have higher activation energy than the low CaO coal.

High Temperature Oxidation of SiC Powder in Oxidizing Atmosphere Containing Water Vapor

2008 ◽  
Vol 403 ◽  
pp. 197-200 ◽  
Author(s):  
T. Akashi ◽  
Miho Kasajima ◽  
Chiharu Muraoka ◽  
Hajime Kiyono
Keyword(s):  
Activation Energy ◽  
Water Vapor ◽  
Weight Gain ◽  
Apparent Activation Energy ◽  
High Temperature Oxidation ◽  
Oxidation Process ◽  
Water Vapor Pressure ◽  
The Other ◽  
Silica Layer ◽  
Temperature Oxidation

Oxidation of SiC powder was studied at 1373 K to 1873 K in Ar-O2, Ar-H2O, and Ar-O2-H2O using thermogravimetry. At 1373 K to 1573K, the weight gain increased with increasing water vapor pressure. The oxidation rate was evaluated on the basis of the Ginstering-Brounshtein kinetic model. In this temperature region, the apparent activation energy for the oxidation was almost the same (139-191 kJmol-1) independent of the atmosphere, suggesting that the same oxidation process proceeds. On the other hand, at temperatures >1673 K, the weight gain in the dry O2 (Ar-O2) was greater than that in the wet and wet O2 (Ar-H2O and Ar-O2-H2O). The apparent activation energy in the dry O2 (442 kJmol-1) was much greater than that in the wet and wet O2. We propose that water molecule diffused in silica layer in the wet and wet O2 atmosphere at 1373 K to 1873 K.

Oxidation kinetics of biodiesel from soybean mixed with synthetic antioxidants BHA, BHT and TBHQ: Determination of activation energy

2014 ◽  
Vol 127 ◽  
pp. 111-116 ◽  
Author(s):  
Dionisio Borsato ◽  
João Rafael de Moraes Cini ◽  
Hágata Cremasco da Silva ◽  
Rodolfo Lopes Coppo ◽  
Karina Gomes Angilelli ◽  
...  
Keyword(s):  
Activation Energy ◽  
Oxidation Kinetics ◽  
Synthetic Antioxidants ◽  
Kinetics Of

Oxidation Kinetics of ZrB2 Ceramic Matrix Composite Materials

2017 ◽  
Vol 900 ◽  
pp. 116-120
Author(s):  
Hong Yu ◽  
Qun Huang ◽  
Wei Wang ◽  
Long Tao Liu ◽  
Cai Wen Li ◽  
...  
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Composite Materials ◽  
Oxidation Kinetics ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Oxidation Time ◽  
Molar Ratio ◽  
Kinetics Of ◽  
Oxidation Weight Gain

Zirconium diboride is widely applied because of some excellent performances. The oxidation kinetics of ZrB2-YAG-Al2O3 composite materials were researched, which helps to improve the performance of ultra-high-temperature composite materials. The results show the oxidation weight gain is decreased with increasing the content of YAG-Al2O3 and the molar ratio of Al2O3. The oxidation weight gain is increased with prolonging the oxidation time under 1300°Cæ, the oxidation weight gain ratio is decreased with prolonging the oxidation time. The effecting tendency of oxidation weight gain is not abvious with varying the contend of YAG-Al2O3 upon 1300°Cæ, however, the effecting tendency of oxidation weight gain is very abvious with varying the molar ratio of Al2O3.

Effect of Tackifier on Thermal Oxidation Kinetics and Effective Storage Time of Raw Natural Rubber

2014 ◽  
Vol 898 ◽  
pp. 102-106
Author(s):  
Bei Long Zhang ◽  
Hong Hai Huang ◽  
Wei Yong Deng ◽  
Yong Zhou Wang ◽  
Li Ding ◽  
...  
Keyword(s):  
Activation Energy ◽  
Natural Rubber ◽  
Thermal Oxidation ◽  
Oxidation Kinetics ◽  
Storage Time ◽  
Hydrazine Sulfate ◽  
Accelerated Storage ◽  
Thermal Oxidation Kinetics ◽  
Storage Times ◽  
Kinetics Of

The thermal oxidation kinetics of natural rubber containing hydrazine dihydrochloride or hydrazine sulfate used as tackifier were studied, and the effective storage time of natural rubber containing tackifier was predicted with a method of heat accelerated storage aging. The results show that the thermal oxidation activation energy of natural rubber containing hydrazine dihydrochloride is 105.6kJ/ mol, being a little higher than that (104.7 kJ/ mol) of the control. The thermal oxidation activation energy of natural rubber containing hydrazine sulfate is 103.1kJ/ mol, being a little lower than that of the control. The effective storage time of natural rubber containing hydrazine dihydrochloride is 13.4 years at 30°C,27.0years at 25°C, and 55.9years at 20°C. The effective storage time of natural rubber containing hydrazine sulfate is 11.6years at 30°C,23.0 at 25°C, and 46.8years at 20°C.The effective storage times of natural rubber containing two tackifiers hydrazine dihydrochloride or hydrazine sulfate are higher than that of the control at the same condition.

scholarly journals Mechanism and kinetics of the oxidation of synthetic α-NiS

2008 ◽  
Vol 73 (2) ◽  
pp. 211-219 ◽  
Author(s):  
Nada Strbac ◽  
Dragana Zivkovic ◽  
Ivan Mihajlovic ◽  
Boyan Boyanov ◽  
Zivan Zivkovic
Keyword(s):  
Activation Energy ◽  
Oxidation Process ◽  
Second Stage ◽  
Stability Diagrams ◽  
Calculation Process ◽  
Reac Tions ◽  
Desulfurization Process ◽  
Mechanism And Kinetics ◽  
Kinetic Investigations ◽  
Kinetics Of

The results of an investigation of the mechanism and kinetics of the oxidation process of synthetic ?-NiS are presented in this paper. The mechanism of ?-NiS oxidation was investigated based on the comparative analysis of DTA-TG-DTG and XRD results, as well as the constructed phase stability diagrams (PSD) for the Ni-S-O system. The kinetic investigations of the oxidation process were performed under isothermal conditions (temperature range 823-1073 K). The obtained degrees of desulfurization were used in the calculation process according to the Sharp model and the kinetic parameters, inclu?ding the activation energies and the rate constants of the characteristic reac?tions, for the oxidation of ?-NiS were determined. These results enabled the formulation of a kinetic equation for the desulfurization process: -ln (1 ? ?) = = k1? = 27.89 exp(-9860/T)?, with an activation energy of 82?4 kJ mol-1, for the first stage of the process and -ln (1 ? ?) = k2? = 1.177 exp(-4810/T)?, with an activation energy of 40?2 kJ mol-1, for the second stage.

Kinetics of Formation of Peroxyformic Acid

1996 ◽  
Vol 61 (10) ◽  
pp. 1457-1463 ◽  
Author(s):  
Vladimír Mošovský ◽  
Zuzana Cvengrošová ◽  
Alexander Kaszonyi ◽  
Milan Králik ◽  
Milan Hronec
Keyword(s):  
Hydrogen Peroxide ◽  
Kinetic Model ◽  
Formic Acid ◽  
Oxidation Kinetics ◽  
Oxidation Process ◽  
Aqueous Hydrogen Peroxide ◽  
Kinetics Of Formation ◽  
Peroxyformic Acid ◽  
Kinetics Of

Oxidation kinetics of formic acid with aqueous hydrogen peroxide (30-70%) has been studied at 45 °C with 0-0.1 M H2SO4 as a catalyst. A kinetic model has been suggested which satisfactorily describes the oxidation process of formic acid to peroxyformic acid.

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