... Descriptors : *CORROSION, *ALUMINUM ALLOYS, IONS ... PROPERTIES, OXIDES, COPPER, AUGER ... COATINGS, PHOSPHORIC ACIDS, PITTING ...
DTIC Science & Technology
Dislocations in nickel single crystals with carbon levels near 100 ppm have been reliably etch pitted on their {111} plane using a chemical (phosphoric acid, nitric acid, ferric chloride) etch for 30 min at room temperature. Carbon doping is found to be necessary for the etch pitting, but fresh ...
NASA Astrophysics Data System (ADS)
... SUBJECT TERMS GaN, etch pits, phosphoric acid, molten KOH ... for GaN because of its chemical stability against various mineral acids and aqua ...
A mixture of nitric and hydrochloric acids was found to yield etch pits on mercury cadmium telluride
NASA Technical Reports Server (NTRS)
We demonstrate a technique based on wet chemical etching that enables quick and accurate evaluation of edge- and screw/mixed-type threading dislocations (TDs) in GaN. Large and small etch pits are formed by phosphoric acid on the etched surfaces. The large etch pits are attributed to screw/mixed TDs and the small ...
The ion-mediated enhancement of xylem hydraulic conductivity in angiosperms is thought to be controlled by the pectin chemistry of intervessel pit membranes. However, there is little or no direct evidence on the ultrastructure and chemical nature of pit membranes in species that show an 'ionic effect'. The potential link between the ...
PubMed
Nerve fibers from pit organs and canal neuromasts are distinguished by the nature of their electrophysiological response to mechanical and chemical stimulation. Pit organs respond to touch but have a relatively high threshold compared with canal neuromasts. They respond readily to sodium and potassium chloride solutions, the rate of ...
An etching reagent for aluminum was prepared by the solution of HCl gas in a solvent consisting of 90 wt.% dioxane (C/sub 4/H/sub 8/O/sub 2/) and 10 wt.% water. The reagent was applied to 99.99% Al previously chemically polished in a phosphoric acid/nitric acid mixture at 25 deg C. lf the concentration of HCl was less than 6M, ...
Energy Citations Database
... Accession Number : ADA083413. Title : Pitting of Plain Carbon Steels in Acidic Solution,. Corporate Author : MATERIALS ...
In the patent copper porphyry ores, especially those too deeply buried for conventional open pit mining, are mined in place by an in situ leaching technique using as a leaching medium a mixture of dilute sulfuric acid, oxygen and nitrate ion added either ...
National Technical Information Service (NTIS)
... the chemical composition. Chromium-free alloys are liable to delocalization of the pitting process. Alloys containing boron ...
... at 70 C or 3%NaCl acidic solution at 30 C, pitting potential depended on S ... at 25 C, the frequency of occurrence or the density of pits increased with ...
... Title : Inhibition of Pitting Corrosion of Iron and Steel in Neutral Solutions by Organic Phosphonic Acid Derivatives,. Corporate Author : ...
This presentation will summarize the results of an investigation of a dirty W48 pit and the subsequent development of a process for cleaning this class of pits in preparation for long-term storage. The residues of the dirty pit were analyzed for chemical ...
UNC Geotech, prime Contractor at the US Department of Energy Grand Junction Projects Office (DOE/GIPO), conducted geophysical surveys of the Cold Pit, Acid Pit, and Pit 9 at the Radioactive Waste Management Complex (RWMC) of the Idaho National Engineering...
Due to the need to close High Level Waste storage tanks, chemical cleaning methods are needed for the removal of sludge heel materials remaining at the completion of mechanical tank cleaning efforts. Oxalic acid is considered the preferred cleaning reagent for heel dissolution of iron-based sludge. However, the large quantity of ...
DOE Information Bridge
... Accession Number : ADD127836. Title : Pitting Mechanism of Aluminum in Hydrochloric Acid under Alternating Current,. Corporate Author : ...
... Accession Number : ADD140188. Title : Pitting Corrosion of 304 Stainless Steel in Phosphoric Acid Solutions,. Descriptive Note : Journal Article,. ...
... behavior and the formation of etch-pits in iron whiskers were studied in the following solutions: 2% nitric acid in alcohol, 4% picric acid in alcohol, a ...
... Accession Number : ADD147136. Title : Effect of Boric Acid on Pit Growth in Alloy 600 Steam Generator Tubing. Descriptive Note : Journal article,. ...
The Chromic Acid Pit site is an inactive waste disposal site that is regulated by the Resource Conservation and Recovery Act of 1976. The 2.2-cubic-yard cement-lined pit was operated from 1980 to 1983 by a contractor to the U.S. Army Air Defense Artillery Center and Fort Bliss. The pit, located on the Fort ...
USGS Publications Warehouse
Two utilities have experienced extensive pitting in their steam generators, and this pitting apparently arose over a relatively short (1-year) period of time. This workshop proceedings provides an interim report on the probable causes of such pitting and the best remedial methods available. The subject areas included: ...
This report discusses particle size and calorimetry analyses performed on single-pull sludge samples collected from the Hanford K East Basin floor and pits. This study was conducted by the Pacific Northwest National Laboratory (PNNL) in support of the baseline sludge management plan, which calls for the sludge to be packaged, shipped and stored at T Plant in the Hanford 200 ...
The effects of normal pulsed Nd-YAG laser irradiation on the acid resistance of human dental enamel of pits and fissures, the cleaning of the pit and fissure contents and fluoride uptake into deep pits and fissures were examined. The acid resistance of the pit and fissure ...
The Mixed Waste Landfill Integrated Demonstration (MWLID) is testing noninvasive site characterization methods at several locations, including the Chemical Waste Landfill (CWL) at Sandia National Laboratories. The CWL comprises shallow, unlined pits that were used for the disposal of acids, oils, solvents, and inorganic compounds from ...
This study reports on the transfer of contaminants from waste rock dumps and mineralised ground into soils, sediments, waters and plants at the rehabilitated Mary Kathleen uranium mine in semi-arid northwest Queensland. Numerous waste rock dumps were partly covered with benign soil and the open pit mine was allowed to flood. The mineralised and waste calc-silicate rock in the ...
Open pit mining below the water table results in pit lakes. This study documents the current level of understanding of issues concerning pit water quality and determines where additional research is needed. The report discusses factors contributing to pit water quality: groundwater flow, water-wall rock reactions ...
... IN PARTICULAR, THE ETCH PIT RESULTS FROM THE SIRTL, SECCO, DASH, AND AN EXPERIMENTAL ETCHANT ARE COMPARED FOR ...
This report presents the results of particle size analyses and calorimetry testing performed on selected single-pull sludge samples collected from the Hanford K East Basin between December 1998 and June 1999. The samples were collected as isolated cores predominantly from areas that had not been previously sampled (e.g., North Loadout Pit, Dummy Elevator ...
... IN METHANOL IN THE PRESENCE OF SULFATES OR CHLORIDES. ... OF METHANOL AND HYDROCHLORIC ACID (HCL), PASSIVATION ...
... The Levee Borrow Pit Investigation (LBPI) was designed to provide data ... vegetation, physical, and chemical aspects of main stem levee borrow pits. ...
... HUMAN FACTORS EVALUATION AND PITTING SURVEY OF THE CHEMICAL BIOLOGICAL SUIT AND ASSOCIATED EQJIPMEN-T IN CO ...
... Title : Uniform Corrosion and Pitting Properties of Various Stainless Steels for Geothermal Power Plants of Binary Cycle Systems in Dilute Acidic ...
... Accession Number : ADD117826. Title : The Effect of Scan Rate on Pitting Potentials of High Performance Alloys in Acidic Chloride Solution,. ...
During the summer and fall of Fiscal Year 1997, a Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) Treatability Study was performed at the Idaho National Engineering and Environmental Laboratory. The study involved subsurface stabilization of a mixed waste contaminated soil site called the Acid Pit. This study represents the ...
... CHARACTERIZATION AND AMINO ACID SEQUENCES OF TWO LETHAL PEPTIDES ISOLATED FROM VENOM OF WAGLER'S PIT VIPER ...
The resistance to corrosion by pitting and by contact in solutions of hydrochloric acids of a number of austenitic stainless steels containing 7.5% molybdenum has been evaluated by using the temperature as a criterion. For corrosion by pitting, a critical...
, it was decided to split with an earth wall the Garrick Area East pit lake into a smaller 71 ML (GAEWMarch 2008 TREATING ACIDITY IN COAL PIT LAKES USING SEWAGE AND GREEN WASTE: MICROCOSM AND FIELD). March 2008 TREATING ACIDITY IN COAL PIT LAKES USING SEWAGE AND GREEN WASTE: MICROCOSM AND FIELD ...
E-print Network
The effect of inorganic and organic acid solutions on the corrosion of copper interconnects is investigated as a function of the copper line width, the type and concentration of the chemical and the agitation speed. The chemical solutions used contained inorganic acids such as HNO3, H3PO4, HCl and organic ...
Adaptive sampling programs offer substantial savings in time and money when assessing hazardous waste sites. Key to some of these savings is the ability to adapt a sampling program to the real-time data generated by an adaptive sampling program. This pape...
Fermentation pit is a kind of solid bioreactors with unique feature for brewing liquor, especially for Luzhou-flavor, which has significant effects on the quality of produced liquor. There exists a close and complicated correlation between pit age (using time) and microbial community. Taking the characteristic component phospholipid fatty ...
In France, dredged sediments may be dumped into submerged gravel pits. As a consequence, adverse effects may be expected. In addition, groundwater quality may be impacted due to hydraulic communications with gravel pits. The immersion of dredged sediments into gravel pits should thus be restricted to clean or slightly contaminated ...
� Intervessel pits act as safety valves that prevent the spread of xylem embolism. Pectin-calcium crosslinks within the pit membrane have been proposed to affect xylem vulnerability to cavitation. However, as the chemical composition of pit membranes is poorly understood, this hypothesis has not been verified. ...
This NACE Standard RP-02-73, was jointly issued with American Petroleum Institute as API Bulletin D-15. The first section suggests some guide lines that can be followed to minimize acid corrosion problems including general corrosion, pitting, and stress cracking. Suggestions pertaining to preparation of well, preparation of the acid, ...
The purpose of this Interim Action Proposed Plan (IAPP) is to describe the preferred interim remedial action for addressing the Chemicals, Metals, and Pesticides (CMP) Pits Operable Unit and to provide an opportunity for public input into the remedial act...
The purpose of this Interim Action Proposed Plan (IAPP) is to describe the preferred interim remedial action for addressing the Chemicals, Metals, and Pesticides (CMP) Pits Operable Unit and to provide an opportunity for public input into the remedial action selection process.
Because concrete is durable and relatively inexpensive, it is the most widely used construction material in industry and manufacturing. When used for chemical containment, however, concrete surfaces must be protected to prevent erosion and sealed to keep chemicals from entering the soil. There are two ways chemicals can deteriorate ...
... sec. into shale cliffs located in the open pit mine of the US Borax and Chemical Corporation, Boron, California. Descriptors ...
... Exfoliated Ticonderoga graphite also gave evidence of oxidation of edge planes and terraces, but in addition the basal planes became highly pitted ...
The characteristics of the intergranular fissuring phenomenon long known for aluminium in hydrochloric acid were reviewed. Electrochemical and morphological studies of pitting corrosion in sulfuric acid containing sodium chloride were described. Intergran...
The etch-pitting behavior of single and polycrystalline molybdenum was examined using various etching solutions and prior heat treatments. Murakami's solution, Wolff's solution, oxalic acid and sulphuric acid in methanol are found effective on planes in a...
The Central Shops Burning Rubble Pit (CSBRP) Operable Unit consists of two inactive rubble pits (631-1G and 631-3G) that have been capped, and one active burning rubble pit (631-2G), where wooden pallets and other non-hazardous debris are periodically bur...
This presentation will summarize the results of an investigation of a dirty W48 pit and the subsequent development of a process for cleaning this class of pits in preparation for long-term storage. The residues of the dirty pit were analyzed for chemical identification and evidence of species known to promote ...
... CRYSTALLOGRAPHIC PLANES, DURING GALVANOSTATIC ANODIC ETCHING OF ALUMINUM SINGLE CRYSTALS IN HYDROCHLORIC ACID,. ...
... MATERIALS), ELECTROCHEMISTRY, HYDROCHLORIC ACID, COLD WORKING, PITTING, SEA WATER CORROSION, PASSIVITY, RAMAN ...
sulfides, sulfites, thiocyanates, and chlorite8 or hypcrchlorites. Pitting action will be accelerated in an acidic medium. Corrosive ...
NASA Website
dismantlement. As part of the plutonium recovery process, workers use hydrogen instead of nitric acid to convert the nuclear pit into plutonium oxide, completely eliminating...
Science.gov Websites
... square, and triangular alternating voltages (AV) on the corrosion of aluminum in dilute nitric acid, sodium nitrate, sodium sulfate, and sodium ...
... In stagnant, acid solutions, chlorine and chloride act synergistically to promote the tendency toward pit initiation in type 317L. ...
We have investigated the pitting corrosion of Al, Al-Cu, and Al-Si thin films in dilute hydrofluoric acid solution. Additions of Cu and, to a lesser extent, Si cause an increase in open circuit potentials (OCP), pit densities and pit sizes as compared to ...
In 2005 and 2006, hydrogeochemical study was carried out in the bipartite Wi?ni�wka Ma?a pit lake of the Holy Cross Mountains (south-central Poland). This is the largest acidic water body in Poland. This report presents the element concentrations in the water and sediment, stable sulfur and oxygen isotope ratios in the soluble sulfates, and stable oxygen ...
Pitting corrosion behavior of zirconium was studied in an oxidizing chloride solution of 1 N hydrochloric acid (HCl) + 1,000 ppm Fe{sup 3+} under simple immersion conditions. Different surface treatments led to different potential transients at the onset of pitting corrosion. The pit morphology varied under ...
Two seepage pits, used for the routine disposal of water containing low- level radioactive wastes, were examined by a soil and groundwater survey. Reactor Pit 2 received 1.75 x 10/sup 8/ gallons and absorbed 11000 curies of soluble beta -emitting radionuclides with 90 g Pu. Of these, 87 curies migrated as cations and the weak front of this ...
This article discusses environmental problems resulting from the production of coal (including the mining, processing, storage, transportation, and conversion of coal). With the development of coal processing and the building of pit head hydroelectric power stations, coking, gasification, and chemical enterprises based on coal, the pollution problems of ...
This document provides guidance for sampling and analysis activities associated with the proposed Resource Conservation and Recovery Act of 1976 (RCRA) clean closure of the 200 West Ash Pit Demolition Site. Soil samples will be taken around the blasting pit, in order to verify that the concentrations of all detonation activity contaminants are below action ...
An adsorption process comprised of inorganic chemically active adsorbents (ICAAs) has been developed for recovery of Fe(III), Cu(II), Zn(II), Cd(II) and Pb(II) from acid mine drainage solutions similar to the Berkeley Pit near Butte, Montana. ICAAs are prepared by immobilization of chelating agents on the ceramic supports. The detailed ...
Etch pits created by hydrochloric and phosphoric acid on cleaved CaF2(111) are investigated by scanning force microscopy (SFM). A geometric and dimensional analysis of the etch pits reveals two distinctly different types. Type-I etch pits evolve at dislocation defects, are pointed and their size and eccentricity is ...
We previously reported several novel bioactive hybrid polyketide-terpenoid metabolites from a deep water Penicillium rubrum isolated from Berkeley Pit Lake, Butte, Montana. In this paper we report the structures of four new amides, berkeleyamides A-D (1, 4, 5, 7), isolated from extracts of this fungus. The structures of these compounds were deduced by analysis of NMR data, ...
Samples were obtained from different locations from the K Each Sandfilter Backwash Pit to characterize the sludge material. These samples were analyzed chemically for elements, radionuclides, and residual compounds. The analytical results were statistical...
The Weldon Spring Site (WSS) is a US Department of Energy surplus facility comprising the Quarry, Raffinate Pits, Chemical Plant, and vicinity properties. Radiological characterization of the WSS is being conducted in four phases: the Raffinate Pits facil...
Aluminum alloys, 2024 and 7075, containing copper were found to react readily with a mixture of methanol and carbon tetrachloride. A homogeneous oxide film covering these metals does not allow the solution to attack the alloy. Pitting corrosion occurs whe...
A feasibility study on the electroless metal plating of teeth has been conducted. The primary purpose of the study was to evaluate the possible use of a chemically deposited metal film as a pit and fissure sealant. All of the work reported was performed o...
The objectives of the study were to evaluate oil pits and other hazards at oil production sites to (1) document the magnitude of wildlife mortality due to exposure to oil and other chemicals, (2) determine the physical and toxic effects of oil pit content...
This document identifies radiological, chemical and physical conditions inside the Fuel Transfer Pit and Fuel Storage Basins. These spaces are located inside the Plutonium Recycle Test Reactor structure (309 Building.) The fuel handling and storage featur...
Light microscopy, bare-film radiography, secondary ion mass spectroscopy, electron microprobe and physical testing were used to examine beryllium specimens exhibiting a stratified, pitted, pattern after chemical milling. The objective was to find the caus...
The Ash Pit Demolition Site had two known demolition events, the first occurred in November of 1984, and the second occurred in June of 1986. These demolition events were a form of thermal treatment for discarded explosive chemical products. Because the A...
... Murakami's solution, Wolff's solution, oxalic acid and sulphuric acid in methanol are found effective on planes in a region 30 degrees about <001 ...
... Title : Characterization and Amino Acid Sequences of Two Lethal Peptides Isolated from Venom of Wagler's Pit Viper, Trimeresurus wagleri. ...
Construction has started on a facility to immobilize high level radioactive waste in borosilicate glass at the Department of Energy's Savannah River Plant. Type 304L stainless steels is generally sufficient for supply tankage and service lines. It is used as the reference material in chemical reprocessing of reactor target and fuel tubes. Type 304L, however, has ...
Construction has started on a facility to immobilize high-level radioactive waste in borosilicate glass at the Department of Energy's Savannah River Plant. Type 304L stainless steel is generally sufficient for supply tankage and service lines. It is used as the reference material in chemical reprocessing of reactor target and fuel tubes. Type 304L, however, has ...
Sulfate-reducing bioreactors are a promising option for the treatment of acid mine drainage. We studied the structure and function of a biofilm in a methanol-fed fixed-bed in-lake reactor for the treatment of an acidic pit lake by a combination of laboratory incubations, chemical and molecular analyses and confocal ...
The general phosphate need in mammalian cells is accommodated by members of the P(i) transport (PiT) family (SLC20), which use either Na(+) or H(+) to mediate inorganic phosphate (P(i)) symport. The mammalian PiT paralogs PiT1 and PiT2 are Na(+)-dependent P(i) (NaP(i)) transporters and are exploited by a group of ...
Exposed, open pit mine highwalls contribute significantly to the production of acid mine drainage (AMD) thus causing environmental concerns upon closure of an operating mine. Available information on the generation of AMD from open-pit mine highwalls is very limit...
EPA Science Inventory
In order to obtain homologous follicle-stimulating hormone (FSH) for in vivo and in vitro studies in the rat, rat recombinant (rec) FSH was produced in Chinese Hamster Ovary (CHO) cells. The synthesized rat recFSH was purified and subjected to physico-chemical and biological characterization. including a comparison with two rat pituitary (pit) and ...
Pitting corrosion in a number of austenitic stainless steels and nickel-based alloys that differ widely in their resistance to corrosion was studied by electrochemical and electron-optical techniques. The effect of contamination of the sulphuric acid elec...
A double layer activation technique was used to monitor the progress of corrosion of a Type 347 stainless steel in aqueous solution. In nitric acid solution, uniform corrosion and pitting were separately identified on the 'top grain' and 'end-grain' surfa...
A problem concerned with the catastrophic pitting of aluminum-alloy (ALMAG 35) castings while being anodized is described. A method for overcoming this problem makes use of recognized preanodizing cleaning techniques. A proposed mechanism for the encounte...
Inorganic Nitrogen and phosphorus were analyzed on snow samples taken from two snow pits near the long-term acrtic LTER mesic acidic tussock experimental plots. The snow layers in each pit were described ... ...
NBII National Biological Information Infrastructure
Hydrofluoric acid is a water solution of hydrogen fluoride (HF). Hydrofluoric acid is used widely in diverse types of industrial applications; traditionally, it is used in pickling solutions in the metal industry, in the fabrication of chlorofluorocarbon compounds, as an alkylation agent for gasoline and as an etching agent in the industry of glass. In ...
The plant genome contains a large number of disease resistance (R) genes that have evolved through diverse mechanisms. Here, we report that a long terminal repeat (LTR) retrotransposon contributed to the evolution of the rice blast resistance gene Pit. Pit confers race-specific resistance against the fungal pathogen Magnaporthe grisea, and is a member of ...
The objective of this investigation was to study the compositional influence on the corrosion behavior of Ni-Cr-Mo dental casting alloys in acidic artificial saliva. Cyclic potentiodynamic and potentiostatic tests were used to evaluate the corrosion behavior of different Ni-Cr-Mo dental casting alloys in deaerated artificial saliva with pH 5 at 37 degrees C. Optical microscope ...
... Title : THE CHEMICAL SYNTHESIS OF NUCLEIC ACIDS. ... Abstract : Translation of Soviet research; the chemical synthesis of nucleic acids. ...
A series of physical and chemical changes occur as olives mature on the tree, and these changes are important for the production of oil and table olives. The aim of this study was to increase the understanding of the maturation process of Gordal Sevillana olives, to optimize harvest timing, and to determine the most appropriate harvesting and post-harvesting processing ...
In 1989 BNL was added to the EPAs National Priorities List. The site is divided into seven operable units (OU). OU-I includes the former landfill area. The field task site is noted as the AOC 2C Glass Holes location. Beginning in the 1960s and continuing into the 1980s, BNL disposed of laboratory waste (glassware, chemicals and animal carcasses) in numerous shallow ...
Previous work relevant to current efforts is summarized. A description of an improved version of a new electrochemical probe, the ArtPit, is given. The distinct feature of the probe for investigating metastable pitting of carbon steels is specified and compared to other approaches. The electrochemical response of the ArtPit under the ...
Intervessel pits play a key role in trees' water transport, lying at the base of drought-induced embolism, and in the regulation of hydraulic conductivity via hydrogels bordering pit canals. Recently, their microstructure has been the focus of numerous studies, but the considerable variation, even within species and the histochemistry of ...
A gallium focused ion beam has been used to create discrete pits on the surface of a SrTiO3 (100) surface with the idea that these pits will serve as the nucleation sites for subsequent Cu2O quantum dot growth. Immediately after pit formation and following wet chemical etching and thermal annealing of the surface, ...
Six methods of storing coal were investigated by the Bureau, and the dry, open-pit method proved to be the most satisfactory for other than very large consumers. Based on studies made at subbituminous coal-storage sites of the Great Western Sugar Co., report contains details of coal-storing techniques, with gas analyses, changes in physical and chemical ...
Earlier (1) the problems and features of standardization of accelerated chemical and electrochemical tests of stainless steels for resistance to pitting corrosion (or pitting resistance) were presented and on the basis of collective experimental data a method of testing in a ferric chloride solution was proposed for standardization. A ...
Purpose of this document is to provide guidance for sampling and analysis activities associated with the proposed Resource Conservation and Recovery Act of 1976 (RCRA) clean closure of the 218-E-8 West Ash Pit Demolition Site. The borrow pit was used for demolition of discarded explosive chemicals, asbestos disposal, tumbleweed ...
