Investigation of Corrosion of Cement-Based Materials by Using of Rotating Disc Method

2012 ◽  
Vol 238 ◽  
pp. 153-156 ◽  
Author(s):  
Daniel Dobiáš
Keyword(s):  
Corrosion Rate ◽  
Rotating Disk ◽  
Rotating Disc ◽  
Liquid Solutions ◽  
Cement Based Materials ◽  
Scope Of Application ◽  
Aggressive Liquid ◽  
Disk Method

The paper introduces the rotating disk method, its features and the scope of application. It also describes the application of this technique in the research of corrosion of cement-based materials caused by aggressive liquid solutions and the effect of flow of solutions on the corrosion rate

Study of the kinetics of dissolution of copper ferritic by the rotating disk method

2018 ◽  
pp. 29-32
Author(s):  
D. S. Reutov ◽  
◽  
B. D. Khalezov ◽  
L. A. Ovchinnikova ◽  
A. S. Gavrilov ◽  
...  
Keyword(s):  
Rotating Disk ◽  
Kinetics Of Dissolution ◽  
Kinetics Of ◽  
Disk Method

scholarly journals Kinetics and Mechanism of Hydroxyapatite Crystal Dissolution in Weak Acid Buffers Using the Rotating Disk Method

1976 ◽  
Vol 55 (3) ◽  
pp. 496-505 ◽  
Author(s):  
Maw-Sheng Wu ◽  
William I. Higuchi ◽  
Jeffrey L. Fox ◽  
Michael Friedman
Keyword(s):  
Surface Resistance ◽  
Rotating Disk ◽  
Weak Acid ◽  
Ionic Activity ◽  
Crystal Dissolution ◽  
Dissolution Reaction ◽  
Activity Product ◽  
Hydroxyapatite Crystal ◽  
Synthetic Hydroxyapatite ◽  
Disk Method

The dissolution rates of synthetic hydroxyapatite pellets under sink conditions were measured using the rotating disk method. The experimental data were analyzed by means of a physical model that yielded an ionic activity product of KHAP = a10 Ca2+ a6 PO4 3- a2OH- = 1 × 10-124.5±1.0 that was found to govern the dissolution reaction. Also, a surface resistance factor of k' equal to about 174 sec/cm was deduced from the data.

scholarly journals MODELING OF HYDROCHEMICAL OXIDATION OF HEAZLEWOODITE WITH NITRIC ACID

2020 ◽  
pp. 65-72
Author(s):  
Анна Игоревна Пичугина ◽  
Ирина Геннадьевна Критова
Keyword(s):  
Mathematical Modeling ◽  
Activation Energy ◽  
Nitric Acid ◽  
Nickel Sulfide ◽  
Nitric Acid Concentration ◽  
Rotating Disk ◽  
Limiting Stage ◽  
Specific Speed ◽  
Modes Of Interaction ◽  
Disk Method

В работе представлены результаты математического моделирования окислительного растворения хизлевудита в растворах азотной кислоты в условиях равнодоступной поверхности вращающегося диска с применением метода полного факторного эксперимента. Получены и проанализированы зависимости скорости процесса гидрохимического окисления сульфида никеля (W, моль/смс) от продолжительности взаимодействия (τ, с), влияния концентрации азотной кислоты (С, моль/дм), частоты вращения диска (ω, с) и температуры (Т, К). Определены основные кинетические параметры: константа скорости и эффективная энергия активации процесса. Установлены режимы взаимодействия хизлевудита с азотной кислотой, выявлены вероятные лимитирующие стадии взаимодействия. The paper presents the results of mathematical modeling of the oxidative dissolution of hizlewudite in solutions of nitric acid using the rotating disk method and the factor experimental design. The dependences of specific speed of dissolution of sulfide of nickel Nickel sulfide (W, mol/cmc) on the duration of interaction (τ, s), the influence of nitric acid concentration (C, mol/dm), frequencies of rotation disk (ω, s) and temperatures (T, K) were obtained and analyzed. The main kinetic parameters are determined: the rate constant and the activation energy of the process. Established modes of interaction heazlewoodite with nitric acid, identified probable limiting stage of the interaction.

scholarly journals The effect of dissolution medium, rotation speed and compaction pressure on the intrinsic dissolution rate of amlodipine besylate, using the rotating disk method

2014 ◽  
Vol 50 (3) ◽  
pp. 513-520 ◽  
Author(s):  
Leandro Giorgetti ◽  
Michele Georges Issa ◽  
Humberto Gomes Ferraz
Keyword(s):  
Dissolution Rate ◽  
Rotation Speed ◽  
Compaction Pressure ◽  
Rotating Disk ◽  
Fractional Factorial ◽  
Amlodipine Besylate ◽  
Dissolution Medium ◽  
Intrinsic Dissolution ◽  
Intrinsic Dissolution Rate ◽  
Disk Method

The aim of this study was to evaluate the effect of dissolution medium, rotation speed and compaction pressure on the intrinsic dissolution rate (IDR) of the antihypertensive drug amlodipine besylate, using the rotating disk method. Accordingly, a fractional factorial design (33-1) was used, employing dissolution media (water, phosphate buffer pH 6.8 and HCl 0.1 M), rotation speed (50, 75 and 100 rpm), and compaction pressure (1000, 1500 and 2000 psi) as independent variables. The assays were randomized and statistically compared using the Statistica(r) 11 software program. Significance testing (ANOVA) indicated that the dissolution medium had a considerable impact on the IDR of amlodipine besylate. Analysis of the linear and quadratic components of the variables led to the proposition of a mathematical model that describes the IDR as a function of the parameters studied. Conversely, the levels of compaction pressure and rotation speed employed during experimental planning were less relevant, especially when the assay was conducted in the HCl 0.1 M medium.

scholarly journals Brownian Motion and Thermophoresis Effects on MHD Three Dimensional Nanofluid Flow with Slip Conditions and Joule Dissipation Due to Porous Rotating Disk

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 729 ◽  
Author(s):  
Nasser Aedh Alreshidi ◽  
Zahir Shah ◽  
Abdullah Dawar ◽  
Poom Kumam ◽  
Meshal Shutaywi ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Velocity Slip ◽  
Rotating Disk ◽  
Physical Parameters ◽  
Fluid Temperature ◽  
Rotating Disc ◽  
Nanofluid Flow ◽  
Slip Conditions ◽  
Fluid Velocities ◽  
Fluid Concentration

This paper examines the time independent and incompressible flow of magnetohydrodynamic (MHD) nanofluid through a porous rotating disc with velocity slip conditions. The mass and heat transmission with viscous dissipation is scrutinized. The proposed partial differential equations (PDEs) are converted to ordinary differential equation (ODEs) by mean of similarity variables. Analytical and numerical approaches are applied to examine the modeled problem and compared each other, which verify the validation of both approaches. The variation in the nanofluid flow due to physical parameters is revealed through graphs. It is witnessed that the fluid velocities decrease with the escalation in magnetic, velocity slip, and porosity parameters. The fluid temperature escalates with heightening in the Prandtl number, while other parameters have opposite impacts. The fluid concentration augments with the intensification in the thermophoresis parameter. The validity of the proposed model is presented through Tables.

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