2 edition of Characterisation of high temperature corrosion products using Raman microscopy found in the catalog.
Characterisation of high temperature corrosion products using Raman microscopy
Christopher John Littleton
Written in English
|Statement||by Christopher John Littleton.|
|Series||Theses (Newcastle upon Tyne Polytechnic)|
Corrosion initiation and propagation under NaCl droplets were observed and recorded using the optical microscope. Various corrosion products formed at steel substrate/NaCl droplet interfaces were identified using in situ and ex situ Raman spectroscopy. The ambient temperature during the experiments was 20°C. B.V. Mahesh, R.K. Singh Raman, Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review, Metallurgical and Materials Transactions A 45A () R.K. Singh Raman, W. H. Siew, Stress Corrosion Cracking of an Austenitic Stainless Steel in Nitrite-containing Chloride Solution, Materials (Special Issue.
The structures of the patinas and of the corrosion products were characterized by scanning electron microscopy, Raman spectroscopy and X‐ray diffraction. Cuprite and cuprous sulfite were found on the brown patina, atacamite on the green chloride patina, and a mixture of gerhardite and rouaite on the blue to green nitrate type patina. Stress Corrosion Cracking, Magnesium Alloys: Application as Human Implants,Corrosion Resistance Coatings; High Temperature Corrosion in Clean Energy Systems, Advanced Coatings and Surface Modifications for Corrosion Resistance, Microbiologically-induced Corrosion and Cracking, Surface and Sub-surface Characterisation of Corrosion.
A comprehensive guide to the forms of high-temperature corrosion and methods for prevention and mitigation. George Lai's book, High-Temperature Corrosion of Engineering Alloys, has been recognized as authoritative and is frequently consulted and often cited by those in the -Temperature Corrosion and Materials Applications is an update and expansion of that previous work. The current work focuses on intergranular stress corrosion cracking (IGSCC) of series, austenitic stainless steels in high-temperature LWR environments. Comparisons are made between cold-worked SS containing stress-corrosion cracks produced in a simulated boiling-water-reactor (BWR) environment during crack-growth tests, and a SS core.
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The oxide layers formed at the surface of the samples exposed to an atmospheric corrosion for 16 h are shown in Fig. order to identify the corrosion products, Raman sampling was taken at different points along the oxide layers, Fig.
Raman spectra of the outer and the two inner oxide layers are shown in Fig. 4, Fig. 5, respectively. Analysis of the spectra clearly revealed the Cited by: The corrosion products formed at the various exposure locations were characterized by Raman microscopy, X-Ray diffraction (XRD) and their morphology was observed by Scanning Electron Microscopy (SEM).
15 hours ago On raw products, Raman is an excellent tool to discriminate between two polymorphic forms. Still, Raman microscopy can also be utilized to discriminate polymorphic forms on tablets or pellets. A homemade tablet of different forms of carbamazepine mixed with excipients was analyzed using a second method.
The aim of this work was to compare the corrosion products formed on carbon steel plates submitted to atmospheric corrosion in urban and industrial atmospheres with those formed after accelerated corrosion tests.
The corrosion products were characterized by X-ray diffraction, Mössbauer spectroscopy, and Raman spectroscopy. The specimens were exposed to natural weathering in both Cited by: Characterisation of high temperature corrosion products using Raman microscopy Author: Littleton, C.
ISNI: Awarding Body: Newcastle upon Tyne Polytechnic Current Institution: University of Newcastle upon Tyne Date of Award: Availability of Full Text.
Raman microscopy has been used to study the nature and distribution of corrosion products formed on iron and iron-chromium alloys in air at high temperatures. Fe and Fe-Cr alloys containing 2, 5, 14, and 18% Cr were oxidized at, and °C for 2 hr, in addition samples of each alloy were oxidized for 24 hr at °C to obtain thicker scales at this temperature.
Fig. 2 shows the surface macro-morphologies of Alloy crevice corrosion specimens after h (Figs. 2a) and h (Fig. 2b) exposure tests in °C water containing 3 ppm DO. Different colors and corrosion morphologies appeared on the free and crevice surfaces, suggesting that crevice corrosion surely occurred during the exposure tests in oxygenated high-temperature water and the.
Since the corrosion products characterization by Raman microscopy was performed in a small area (laser spot of ca. 4 mm 2), a quantitative contribution of each phase found is not possible even probing different regions. However, it was possible to associate the color of the oxide to a particular phase.
In situ Raman spectroscopy is used to study the layered mineral phengite K(Al, Mg)2(Si, Al)4O10(OH)2 in water under the high temperature and pressure conditions typical of cold subduction zones (T. Abstract. In situ high-temperature healing of cracks in composites made of glass and vanadium boride (VB) particles was observed using an environmental scanning electron microscope equipped with a high-temperature chamber (HT-ESEM).
HT-ESEM is an adequate tool for studying the self-healing property of these materials. The change in crack length as a function of redox atmospheric conditions. The distribution of wood preservative coatings in wood surface layer was assessed at the cellular level using confocal Raman microscopy.
Raman images were created based on the fingerprint Raman bands of the different wood polymers and coating components (resin and pigment). The wood cell walls and the distribution of the resin and pigment were clearly visualized at the same time.
Corrosion products on three bronze swords found in tombs dating from the Warring States period at Lijiaba site, Yunyang county, Chongqing were characterized by Raman and X-ray fluorescence spectroscopies.
The major corrosion products were cuprite, malachite, cerussite and cassiterite, along with the copper and lead phosphates, libethenite and pyromorphite. The presence of. 2 days ago Firstly, X-ray powder diffraction (XRD) was used to determine the crystal phase (Fig.
1b) of these black characterization results shown. Micro-Raman spectra were taken in backscattering geometry using a Renishaw inVia Raman microscope (× objective lens and numerical aperture NA =spatial resolution 1 μm) with nm HeNe excitation laser, 1 s exposure time, accumulations and laser power reduced by filters to μW to avoid sample degradation due to heating effects.
Raman spectroscopy (/ ˈ r ɑː m ən /); (named after Indian physicist C. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified.
Use of these simulant materials allowed further analysis of the thermal characteristics of LFCM and the corrosion kinetics, giving results that are in good agreement with the limited available.
The composition of Palaeolithic rock paintings from the Tito Bustillo and El Buxu caves (30 –10 bp, Asturias, Spain) have been characterised by Raman microscopy with auxiliary techniques (scanning electronic microscopy/energy dispersive X‐ray, infrared, X‐ray diffraction and X‐ray photoelectron spectroscopy).
A supposed source. This book is a collection of proceedings of a symposium organized by the North Carolina Section of the American Chemical Society on the preparations, properties, and processing of high-temperature superconducting materials.
The proceedings include papers of new results presented at the symposium. The corrosion products formed at the various exposure locations were characterized by Raman microscopy, X-Ray diffraction (XRD) and their morphology was observed by Scanning Electron Microscopy (SEM).
Three regions of different colours (yellow, black and red) have been identified over the steel coupons by Raman microscopy. Exposure testing was performed on CoCrFeMnNi equiatomic high entropy alloy (HEA) produced via directed energy deposition additive manufacturing in NaNO 3-KNO 3 (60–40 wt%) molten salt at °C for 50 h to evaluate the corrosion performance and oxide film chemistry of the HEA.
Potentiodynamic electrochemical corrosion testing, scanning electron microscopy, focused ion. Microscope: High resolution, camera-equipped optical Provides valuable product lifetime data by simulating severe environmental conditions that accelerate the aging process.
Raman Spectrometer: Using laser light, this instrument is used to identify the composition of a variety – Furnaces for High- temperature Processing. Materials.Corrosion tests and time-resolved high-temperature X-ray Diffraction analyses Applications The characterization of phase transformations using Raman spectroscopy Ex-situ Raman analysis: application on olivine High temperature in-situ Raman analysis: application on zirconia and Yttria Scanning electrochemical microscopy (SECM) is a technique within the broader class of scanning probe microscopy (SPM) that is used to measure the local electrochemical behavior of liquid/solid, liquid/gas and liquid/liquid interfaces.
Initial characterization of the technique was credited to University of Texas electrochemist, Allen J. Bard, in