Short-term static corrosion tests in lead–bismuth

2001 ◽  
Vol 296 (1-3) ◽  
pp. 273-281 ◽  
Author(s):  
L Soler Crespo ◽  
F.J Martı́n Muñoz ◽  
D Gómez Briceño
Keyword(s):  
Short Term ◽  
Corrosion Tests ◽  
Static Corrosion

Alteration-Phase formation and Associated Cesium Release During Alteration of R7T7 Waste Glass

2002 ◽  
Vol 713 ◽  
Author(s):  
Y. Inagaki ◽  
K. Idemitsu ◽  
T. Arima ◽  
T. Maeda ◽  
H. Ogawa ◽  
...  
Keyword(s):  
Phase Formation ◽  
Elevated Temperatures ◽  
Waste Glass ◽  
Solution Ph ◽  
Crystalline Phases ◽  
Corrosion Tests ◽  
Amorphous Phases ◽  
Glass Corrosion ◽  
Static Corrosion

ABSTRACTStatic corrosion tests were performed with an inactive HLW glass of R7T7 type in order to evaluate alteration-phase formation and associated Cs release during the glass corrosion. The tests were performed in NaOH solutions at elevated temperatures in order to accelerate the corrosion. Crystalline phases formed in the corroded glass were analyzed by use of XRD, in addition to the solution analysis. The results indicated that; 1)Analcime or Na-beidellite or both of them form during the corrosion depending on the conditions, 2)Si rich amorphous phases are contained in the alteration-phases, 3)In addition to solution pH, solution concentrations of Na and K sensitively affect formation of analcime and Na-beidellite, 4)Analcime formation accelerates the glass corrosion, 5)Most of Cs in the glass is retained in the alteration-phases by sorption onto Na-beidellite or incorporation into amorphous phases and pollucite

Effects of Redox Condition on Waste Glass Corrosion in the Presence of Magnetite

1995 ◽  
Vol 412 ◽  
Author(s):  
Ylnagaki ◽  
A. Ogata ◽  
H. Furuya ◽  
K. Idemitsu ◽  
T. Banba ◽  
...  
Keyword(s):  
Amorphous Silica ◽  
Waste Glass ◽  
Redox Condition ◽  
Mixed Gas ◽  
Anoxic Conditions ◽  
Corrosion Tests ◽  
Glass Corrosion ◽  
Simulated Waste ◽  
Dominant Process ◽  
Static Corrosion

AbstractStatic corrosion tests of a powdered simulated waste glass were performed in the presence of magnetite under oxic and anoxic conditions, respectively. The corrosion tests under oxic conditions were performed in air, and those under anoxic conditions were performed in a glove box purged with mixed gas(Ar+5%H2). The experimental results showed that the presence of magnetite can enhance glass corrosion under both oxic and anoxic conditions, and the enhancement under anoxic conditions was small compared to that under oxic conditions. A large portion of the Si and insoluble elements were sorbed onto the magnetite surface, and the sorption under anoxic conditions was small compared to that under oxic conditions.It was suggested that the enhancement of glass corrosion by magnetite results from the sorption or precipitation of silica on the magnetite surface, which can be greatly affected by redox condition. Under anoxic conditions, it was suggested that precipitation of amorphous silica on the magnetite surface may be the dominant process for enhancement of glass corrosion in addition to sorption.

Effect of Sn on Corrosion Resistance of Mg-6Al-1.2Y-0.9Nd Alloy

2011 ◽  
Vol 117-119 ◽  
pp. 1334-1337 ◽  
Author(s):  
Hai Juan Kang ◽  
Quan An Li ◽  
Wei Zhou ◽  
Qing Zhang
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Scale Analysis ◽  
Nacl Solution ◽  
Corrosion Tests ◽  
Corrosion Scale ◽  
Static Corrosion

The effect of Sn addition on corrosion behavior of Mg-6Al-1.2Y-0.9Nd alloy in 3.5wt.% NaCl solution has been researched by static corrosion tests, corrosion morphologies observation, microstructure and corrosion scale analysis. The result shows that, with the content of Sn increasing, the corrosion rate decreases at first and then increases. When the addition of Sn is 1wt.%, the corrosion rate is the lowest and the corrosion resistance is improved obviously.

Effects of Water Redox Conditions and Presence of Magnetite on Leaching of Pu and Np From HLW Glass

1997 ◽  
Vol 506 ◽  
Author(s):  
Y. Inagaki ◽  
H. Sakata ◽  
H. Furuya ◽  
K. Idemitsu ◽  
T. Arima ◽  
...  
Keyword(s):  
Deionized Water ◽  
Corrosion Products ◽  
Redox Conditions ◽  
Mixed Gas ◽  
Iron Corrosion ◽  
Corrosion Tests ◽  
Reducing Conditions ◽  
Dissolved Species ◽  
Static Corrosion

ABSTRACTThe objective of this study is to evaluate the effects of water redox conditions and of the presence of iron corrosion products (magnetite) on the release of actinides from HLW glasses. Static corrosion tests were performed on a simulated HLW glass doped with Pu and Np in deionized water in the presence of magnetite under oxidizing and reducing conditions. The tests under oxidizing conditions were performed in air, while the tests under reducing conditions were performed in mixed gas (Ar+5%H2) atmosphere.The following results were obtained: (1) The presence of magnetite enhances formation of colloids containing Pu and Np in the leachates under both redox conditions. (2) Redox conditions have no remarkable influence on the release of Pu. (3) The reducing conditions combined with the presence of magnetite cause a decrease in the concentrations of Np dissolved species, which is probably the result of the reduction of Np(V) to Np(IV) at the magnetite surface.

Static corrosion tests in oxygen-saturated liquid Pb-Bi

2002 ◽  
Vol 2002.4 (0) ◽  
pp. 271-272
Author(s):  
Yuji KURATA ◽  
Masatoshi FUTAKAWA ◽  
Shigeru SAITO
Keyword(s):  
Saturated Liquid ◽  
Corrosion Tests ◽  
Static Corrosion

Effects of Redox Conditions of Water on Pu and Cm Leaching from Waste Glass

1996 ◽  
Vol 465 ◽  
Author(s):  
Y. Inagaki ◽  
A. Sakai ◽  
H. Furuya ◽  
K. Idemitsu ◽  
T. Arima ◽  
...  
Keyword(s):  
Colloidal Particles ◽  
Waste Glass ◽  
Redox Conditions ◽  
Mixed Gas ◽  
Corrosion Tests ◽  
Steel Container ◽  
Reducing Conditions ◽  
Simulated Waste ◽  
Dominant Phase ◽  
Static Corrosion

ABSTRACTStatic corrosion tests were performed on the simulated waste glass doped with Pu and Cm (PuO2; 0.22wt%, Cm2O3; 0.09%) in deionized water at 90 °C with S/V ratio of 2600 m−1 under oxidizing and reducing conditions, respectively. The corrosion tests under oxidizing conditions were performed in air, while the corrosion tests under reducing conditions were performed in an airtight stainless steel container purged with mixed gas (Ar+5%H2), where the Eh of the solution was maintained at approximately -0.45 V vs SHE. The results showed that the redox conditions have no remarkable influence on the leaching behavior of Pu and Cm. It was also observed that the Pu and Cm concentrations in the 1.8nm filtered solutions were one or two orders of magnitude lower than those in the 450nm filtered solutions under both redox conditions, which suggests that the insoluble suspended fractions (colloidal particles) with the size from 1.8nm to 450nm are dominant phase for Pu and Cm in the solution under both redox conditions.

Conceptual short-term memory (CSTM) supports core claims of Christiansen and Chater

2016 ◽  
Vol 39 ◽  
Author(s):  
Mary C. Potter
Keyword(s):  
Working Memory ◽  
Rapid Serial Visual Presentation ◽  
Language Comprehension ◽  
Short Term Memory ◽  
Visual Presentation ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Use Of Knowledge

AbstractRapid serial visual presentation (RSVP) of words or pictured scenes provides evidence for a large-capacity conceptual short-term memory (CSTM) that momentarily provides rich associated material from long-term memory, permitting rapid chunking (Potter 1993; 2009; 2012). In perception of scenes as well as language comprehension, we make use of knowledge that briefly exceeds the supposed limits of working memory.

Ultrastructural Changes of Canine Kidneys During 24-Hour Perfusion on a LI-400 Preservation System

1971 ◽  
Vol 29 ◽  
pp. 316-317
Author(s):  
M. O. Magnusson ◽  
D. G. Osborne ◽  
T. Shimoji ◽  
W. S. Kiser ◽  
W. A. Hawk
Keyword(s):  
Electron Microscopy ◽  
Electrolyte Solution ◽  
Ultrastructural Changes ◽  
Midline Incision ◽  
Short Term ◽  
Pentobarbital Anesthesia ◽  
Pulsatile Perfusion

Short term experimental and clinical preservation of kidneys is presently best accomplished by hypothermic continuous pulsatile perfusion with cryoprecipitated and millipore filtered plasma. This study was undertaken to observe ultrastructural changes occurring during 24-hour preservation using the above mentioned method.A kidney was removed through a midline incision from healthy mongrel dogs under pentobarbital anesthesia. The kidneys were flushed immediately after removal with chilled electrolyte solution and placed on a LI-400 preservation system and perfused at 8-10°C. Serial kidney biopsies were obtained at 0-½-1-2-4-8-16 and 24 hours of preservation. All biopsies were prepared for electron microscopy. At the end of the preservation period the kidneys were autografted.

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