Download Crevice Corrosion Of Uranium And Uranium Alloys
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Patent US3607673 - Method for measuring corrosion rate - Google Patents
United States Patent Inventor Robert G. Seyl Evanston, Ill. App]. No. 713,576 Filed Mar. 18, 1968 Patented Sept. 21, 1971 Assignee Magna Corporation Santa Fe Springs, Calif. METHOD FOR MEASURING CORROSION RATE 4 Claims, 3 Drawing Figs. us. c1 204/1, 204/195, 324/29, 324/71 1m. 01 00111 27/46 Field 01' Search 204/1 1,  References Cited UNITED STATES PATENTS 3,069,332 12/1962 Seyl 204/195 3,406,101 10/1968 Kilpatrick 204/1 1 Primary Examiner-T. Tung Attorney-Mann, Brown, McWilliams and Bradway ABSTRACT: A system for correcting for the 1R drop between electrodes when corrosion rate of the electrodes is measured by applying a small DC voltage across the electrodes. lonic conductor resistance is measured by an AC circuit and the AC circuit is then used to adjust a resistor to an equivalent value whereupon the adjustable resistor is used to add a compensating voltage gain to the voltage applying circuit. METHOD FOR MEASURING ...http://www.google.com/patents/US3607673?dq=6,757,682
Corrosion inhibition potential of pyrimethamine for mild steel corrosion in acidic medium | Asian Journal Of Science And...
Corrosion is a gradual degradation of materials, usually metals by chemical reaction with its environment. Corrosion of metals constitutes a major problem facing most construction firms. In recent years, more efforts are directed towards investigation of mild steel corrosion perhaps due to increased technologically related applications of mild steel and metals in general for industrial and domestic purposes. This study investigates corrosion inhibition of mild steel by pyrimethamine in 2.0M HCl, by gravimetric analysis. Essential parameters like corrosion rate, percentage inhibition efficiency and degree of surface coverage were obtained from data generated experimentally. Facts gathered from analysis of generated data and review of related literature, revealed that; pyrimethamine significantly (p,0.5) reduced the ...http://journalajst.com/corrosion-inhibition-potential-pyrimethamine-mild-steel-corrosion-acidic-medium
Corrosion of Reinforcement in Concrete. Monitoring, by M Raupach, B Elsener, R Polder, J Mietz - The High Fidelity Books
Bautista and S. Feliu, Cem. Concr. , 1996, 26, 501. 5. P. Novák, R. Malá and L. Joska, Cem. Concr. , 2001, 31, 589. 6. W. Breit, Mater. , 1998, 49, 539. 7. O. A. Kayyali and M. N. Haque, Mag. Concr. , 1995, 47, 235. 8. L. Zimmermann, B. Elsener and H. Böhni, Corrosion of Reinforcement in Concrete, Corrosion Mechanisms and Corrosion Protection, European Federation of Corrosion Publication No 31, IOM Communications Ltd, 2000, p. 25. 9. P. Novák and R. Malá, Corrosion of Reinforcement in Concrete, Corrosion Mechanisms and Corrosion Protection, EFC Publication No 31, IOM Communications Ltd, 2000, p. The values for the real and imaginary components at a given frequency were much higher for electrodes with high corrosion potentials than those with ...http://thehighfidelityreport.com/library/corrosion-of-reinforcement-in-concrete-volume-38-monitoring-prevention-and
Sensors | Free Full-Text | A New Corrosion Sensor to Determine the Start and Development of Embedded Rebar Corrosion Process...
The corrosion of reinforcements induced by chloride has resulted to be one of the most frequent causes of their premature damage. Most corrosion sensors were designed to monitor corrosion state in concrete, such as Anode-Ladder-System and Corrowatch System, which are widely used to monitor chloride ingress in marine concrete. However, the monitoring principle of these corrosion sensors is based on the macro-cell test method, so erroneous information may be obtained, especially from concrete under drying or saturated conditions due to concrete resistance taking control in macro-cell corrosion. In this paper, a fast weak polarization method to test corrosion state of reinforcements based on electrochemical polarization dynamics was proposed. Furthermore, a new corrosion sensor ...http://www.mdpi.com/1424-8220/13/10/13258/notes
DIGITAL.CSIC: Study of the effect of acetic acid vapor on copper corrosion at 40 and 80% relative humidity
Copper corrosion rate and corrosion products originating from acetic acid vapors have been studied using gravimetric, scanning electron microscopy, X-ray photoelectron spectroscopy, and argon-ion sputtering techniques. Copper specimens were exposed to the action of 10, 100, and 300 ppm acetic acid vapors generated in laboratory experiments at 40 and 80% relative humidity (RH) for a period of 21 days and at 30°C. The copper corrosion rate was in the range from 0.08 to 0.17 mg/dm2/day (mdd) for 40% RH and from 0.11 to 6.53 mdd for 80% RH. The main compounds found were cuprite [Cu2O], copper hydroxide [Cu(OH)2], and copper acetate [Cu(CH3COO)2]. A corrosion process model is proposed in which copper acetate is formed from copper hydroxide present on the copper surface ...https://digital.csic.es/handle/10261/21407
Indian Patents. 257259:A NAPHTHENIC ACID CORROSION INHIBITION COMPOSITION
While various corrosion inhibitors are known in various arts, the efficacy and usefulness of any particular corrosion inhibitor is dependent on the particular circumstances in which it is applied. Thus, efficacy or usefulness under one set of circumstances often does not imply the same for another set of circumstances. As a result, a large number of corrosion inhibitors have been developed and are in use for application to various systems depending on the medium treated, the type of surface that is susceptible to the corrosion, the type of corrosion encountered, and the conditions to which the medium is exposed. For example, U.S. Pat. No. 3,909,447 describes certain corrosion inhibitors as useful against corrosion in relatively low temperature oxygenated aqueous systems such ...http://www.allindianpatents.com/patents/257259-a-naphthenic-acid-corrosion-inhibition-composition
Patente WO2016089459A1 - Methods and systems for suppressing corrosion of steel surfaces - Google Patentes
Certain metal surfaces are often unable to be contacted effectively with fluids containing hydrofluoric acid due to significant corrosion issues. Steel surfaces represent but one example. Corrosion inhibitor compositions comprising an N-(phosphonoalkyl)iminodiacetic acid or any salt thereof can be used to suppress corrosion of steel surfaces, including those that contain multiple types or grades of steel. Methods for suppressing corrosion of a steel surface can comprise: contacting a steel surface with a corrosive environment, the corrosive environment comprising hydrofluoric acid; exposing the steel surface to a corrosion inhibitor composition, the corrosion inhibitor composition comprising an N-(phosphonoalkyl)iminodiacetic acid or any salt thereof; and suppressing ...http://www.google.es/patents/WO2016089459A1?cl=en
Numerical Analysis of Corrosion Behavior and Oxygen Transport in the Nature Convection Lead-Bismuth Flow | Heat Transfer, Part...
A two-dimensional numerical analysis of oxygen transport and corrosion behaviors in a coupled natural convection and lead bismuth eutectic (LBE) flow in a two dimensional container was carried out in detailed. In present study, it is assumed the corrosion product (iron) concentration is at its equilibrium level at the wall. The wall boundary condition for the mass transfer of corrosion production and oxygen concentration was taken based on the active oxygen control model. And also the oxygen transport in the LBE loop flow was simulated for testing and calibrating flow concentration level oxygen sensors. Both of the corrosion/precipitation rates at the wall, distribution of corrosion product and oxygen, and oxygen diffusion time are analyzed. Some useful information was obtained to understand the mechanism of ...http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1582131
Metals | Free Full-Text | Corrosion Properties in Sodium Chloride Solutions of Al-TiC Composites in situ Synthesized by HFIHF
Al-TiC nanocomposite materials have been prepared by a new in situ synthesizing technique. A mixture of aluminum, titanium, and graphite has been prepared using ball milling technique and then melted in a high frequency induction heat furnace (HFIHF) at different sintering temperatures, namely 900, 1100, and 1300 °C. The effect of sintering temperature on the corrosion of the Al-TiC composite in 3.5% NaCl solutions was investigated using cyclic potentiodynamic polarization, chronoamperometric current-time, open-circuit potential, and electrochemical impedance spectroscopy measurements. The surface of the composites after their corrosion in the test solution was investigated using scanning electron microscopy and energy dispersive X-ray analyses. It has been found that all manufactured composites suffer uniform corrosion. All corrosion test techniques were ...http://www.mdpi.com/2075-4701/5/4/1799
Electrochemical corrosion of silicon carbide ceramics - Sydow - 2009 - Materials and Corrosion - Wiley Online Library
Recently, SiC-based ceramics have been found to exhibit corrosion damage patterns, which can only be explained by electrochemical processes. Therefore, the current work focusses on the electrochemical test procedures to determine the corrosion behaviour of solid state sintered silicon carbide (SSiC) ceramics in acidic and alkaline media. The corrosion current densities have been determined from linear voltammetric scans. At anodic polarization potentials, electrochemically induced etching patterns were observed in alkaline solution. The formation of pores and crevices during electrochemical oxidation in acidic solution could be monitored by field emission scanning electron microscopy (FESEM) in addition to transmission electron microscopy (TEM). Impedance spectra measured after anodic polarization could be described by the assumption of a pore model equivalent circuit. ...http://onlinelibrary.wiley.com/doi/10.1002/maco.200905448/full
CORROSION KINETICS OF NICKEL-BASE ALLOYS WITH HIGH CHROMIUM CONTENTS UNDER SIMULATED BWR NORMAL WATER CHEMISTRY CONDITIONS AND...
In light water reactors corrosion-induced material degradation is a critical issue not only for material integrity but also for plant radiation field build-up. In BWRs nickel-base alloys, such as Alloy 600, Alloy 82 and Alloy 182, are applied in various parts of reactor components including welds. However, their corrosion mechanisms are not very well understood. Although the complex compositions of different nickel-base alloys generally prohibit us to single out some specific alloy constituent having a major impact on alloy corrosion rate, a higher chromium content is often thought to be beneficial to forming a more protective oxide film against corrosion attack. In this paper we report a corrosion kinetics study on high chromium nickel-base alloy welding consumables, Alloy 52M and Alloy 152, under simulated BWR normal water chemistry ...http://liu.diva-portal.org/smash/record.jsf?pid=diva2:882063
Wholesale Acid Corrosion Inhibitor, China Wholesale Acid Corrosion Inhibitor Manufacturers & Suppliers | Made-in-China.com
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Corrosion and Irritation Tests of a Dental Aluminum Bronze
Corrosion and irritation tests of a dental aluminium bronze. B.I. ARDLIN*1,2, B. LINDHOLM-SETHSON1 and J.E. DAHL2, 1Umeå University, Sweden, 2NIOM - Nordic Institute of Dental Materials, Haslum, Norway. Objectives: The aims of this investigation were to study the corrosion of a copper-aluminium-nickel alloy for fixed prostheses, and to evaluate possible irritant effects of the corrosion products.. Methods: The alloy NPG+2 with the nominal composition Cu:77.3; Al:7.8; Ni:4.3; Fe:3.0; Zn:2.7; Au:2.0; Mn:1.7, was characterized. Static immersion in saline lactic acid solution was selected to quantify metallic elements released in a milieu simulating the condition of plaque build-up in interproximal areas. Corrosion and surface reactions in artificial saliva and saline solutions were studied by electrochemical techniques including registration of polarization curves and ...http://umu.diva-portal.org/smash/record.jsf?pid=diva2:145623
"Migration of Corrosion Products from Modular Hip Prostheses. Particle " by Robert M. Urban, Joshua J. Jacobs et al.
Migration of solid corrosion products from the modular head-neck junction of fifteen total hip replacements to the periprosthetic tissues was studied. The devices and tissues were recovered at the time of a revision procedure or at autopsy after a mean of sixty-four months (range, eight to ninety-seven months). The prostheses had a cobalt-chromium-alloy head coupled with a cobalt-chromium-alloy or a titanium-alloy stem. The solid corrosion product was identified by electron microprobe analysis and Fourier transform infrared microprobe spectroscopy as a chromium orthophosphate hydrate-rich material. The product was present at the junction of the modular head and neck and as particles within the periprosthetic tissues as early as eight months postoperatively. In several hips, it was also present on the polyethylene bearing surface. The particles in the tissues ranged in size from less than one to 500 micrometers. They were ...https://surface.syr.edu/bce/9/
Inspection under external corrosion blisters | Sonomatic
External corrosion is a growing threat to the integrity of ageing pressure equipment. Consequently, plant owner/operators usually have in place fabric maintenance programmes aimed at preventing external corrosion but where it is found already active the focus shifts to rectification. This relies on removal of corrosion product, cleaning and repainting or repair using composite wraps. Before the corrosion product can removed it is necessary to establish that there is sufficient remaining wall thickness to allow the work to be completed safely. Hence there is a need in the industry to reasonably accurately measure the remaining wall thickness under regions of external corrosion.. Sonomatic offers a number of inspection solutions for measurement of steel thickness under corrosion.. ...http://sonomatic.com/advanced-inspection/applications/pipelines/inspection-under-external-corrosion-blisters
Corrosion is electric
The corrosion process (anodic reaction) of the metal dissolving as ions generates some electrons that are consumed by a secondary process (cathodic reaction). These two processes have to balance their charges. The sites hosting these two processes can be located close to each other on the metal's surface, or far apart depending on the circumstances. This simple observation has a major impact in many aspects of corrosion prevention and control, for designing new corrosion monitoring techniques to avoiding the most insidious or localized forms of corrosion.. One simple way to illustrate the two processes in a corrosion reaction is to use an external power source as illustrated in the corrosion current experiment. ...http://corrosion-doctors.org/Experiments/Electric.htm
The Proposed Yucca Mountain Repository From A Corrosion Perspective - Digital Library
Corrosion is a primary determinant of waste package performance at the proposed Yucca Mountain Repository and will control the delay time for radionuclide transport from the waste package. Corrosion is the most probable and most likely degradation process that will determine when packages will be penetrated and the shape, size, and distribution of those penetrations. The general issues in corrosion science, materials science and electrochemistry are well defined, and the knowledge base is substantial for understanding corrosion processes. In this paper, the Yucca Mountain Repository is viewed from a corrosion perspective. A major component of the long-term strategy for safe disposal of nuclear waste at the Yucca Mountain Repository is first to completely isolate the radionuclides in the waste packages for long times and to greatly retard the ...https://digital.library.unt.edu/ark:/67531/metadc779736/
Corrosion Protection Rubber Coating Market Research Report Now Available at Research Corridor | Icoas2013
Corrosion Protection Rubber Coating Market Research Report Now Available at Research Corridor. Research Corridor has published a new research study titled "Corrosion Protection Rubber Coating Market - Growth, Share, Opportunities, Competitive Analysis and Forecast, 2017 - 2025". The Corrosion Protection Rubber Coating market report studies current as well as future aspects of the Corrosion Protection Rubber Coating Market based upon factors such as market dynamics, key ongoing trends and segmentation analysis. Apart from the above elements, the Corrosion Protection Rubber Coating Market research report provides a 360-degree view of the Corrosion Protection Rubber Coating industry with geographic segmentation, statistical forecast and the competitive landscape.. Browse the complete report at ...http://www.icoas2013.org/corrosion-protection-rubber-coating-market-research-report-now-available-at-research-corridor/
Nanomaterials | Free Full-Text | Evaluation of the Corrosion Resistance Properties of Electroplated Chitosan-Zn1−xCuxO...
Novel chitosan-zinc copper oxide (Zn1−xCuxO) composites were electrochemically synthesized through galvanostatic deposition. The prepared chitosan-based composite thin films were elaborately investigated to determine their structural, morphological, compositional, impedance, and corrosion properties. X-ray diffraction analysis was performed to reveal their structural orientation of composite thin films. Energy dispersive analysis by X-ray evidently confirmed the existence of Zn, Cu, and O in the composite thin films. Nyquist plots revealed that the chitosan-Zn1−xCuxO thin films had obvious semi-circular boundaries, and higher resistance was observed for chitosan-ZnO due to the grain boundary effect. Corrosion properties were evaluated using both an electrochemical method and the ASTM weight gain method, which revealed good corrosion rates of 34 and 35 × 10−3 mm/y, respectively, for chitosan-ZnO thin ...http://www.mdpi.com/2079-4991/7/12/432
Corrosion Control for Water System Piping and Storage Tanks
Corrosion is a process that attacks buried metallic water distribution and transmission piping often resulting in unexplained water loss, service disruptions, and increased maintenance and operating costs. A recent study indicated the annual cost of corrosion of water systems in the United States alone exceeds $22 billion and is expected to grow.. The goal of this material is to identify the corrosion process and proven measures that can be employed to reduce corrosion's negative impact on metallic piping and associated fittings. Eliminating or reducing corrosion will not only help conserve water, but also reduce leaks and extend the life of water piping systems. Topics to be reviewed and discussed will include stray electrical currents, aggressive soils, bimetallic coupling, coatings, cathodic protection, ...https://www.planning.org/events/eventsingle/9133203/
Corrosion Engineering Jobs in North America | Rigzone
Corrosion engineering is a discipline of engineering intended to prevent deterioration and damage to assets due to the chemical process known as corrosion. A corrosion engineer's main focus is to study, monitor, control and prevent the corrosion process, both safely and economically. In the oil and gas industry, corrosion engineers are especially valuable because almost all oil and gas products must pass through steel at some point, whether it be during drilling, transporting through a pipeline, or in a refinery setting. Corrosion engineers use a combination of skills but typically have a chemical, material science, or metallurgical background.. ...http://www.rigzone.com/oil/jobs/regional/north-america/corrosion-engineering-587/
Buy Reinforced Steel Bar Corrosion Inhibitor of concrete Price,Size,Weight,Model,Width -Okorder.com
Buy Reinforced Steel Bar Corrosion Inhibitor of concrete, Find Details include Size,Weight,Model and Width about Reinforced Steel Bar Corrosion Inhibitor of concrete. Make an Inquiry for Reinforced Steel Bar Corrosion Inhibitor of concrete at OKorder.com.http://www.okorder.com/p/reinforced-steel-bar-corrosion-inhibitor-of-concrete_665828.html
Can corrosion be transferred? | Physics Forums - The Fusion of Science and Community
I have tested stainless steel sample coated by a layer that claims to improve the hardness of the material without reducing corrosion resistance. After 72 hours of salt corrosion tests, I have found that there was corrosion. The corrosion was on the outside it did not travel beyond the coating layer and SEM analysis confirmed this. So say only the coating material experiences some corrosion and it improves hardness with no corrosion to the base material (Stainless Steel Sample ...https://www.physicsforums.com/threads/can-corrosion-be-transferred.792314/
Materials | Free Full-Text | In Vivo Corrosion of Two Novel Magnesium Alloys ZEK100 and AX30 and Their Mechanical Suitability...
In magnesium alloys, the components used modify the alloy properties. For magnesium implants in contact with bone, rare earths alloys are commonly examined. These were shown to have a higher corrosion resistance than other alloys and a high mechanical strength, but their exact composition is hard to predict. Therefore a reduction of their content could be favorable. The alloys ZEK100 and AX30 have a reduced content or contain no rare earths at all. The aim of the study was to investigate their in vivo degradation and to assess the suitability of the in vivo µCT for the examination of their corrosion. Implants were inserted in rabbit tibiae. Clinical examinations, X-rays and in vivo µCT scans were done regularly. Afterwards implants were analyzed with REM, electron dispersive X-ray (EDX), weighing and mechanical testing. The in vivo µCT is of great advantage, because it allows a quantification of the ...http://www.mdpi.com/1996-1944/4/6/1144