Download or read book Analysis of Hydrogen Evolution and Entry Into Metals for the Discharge Recombination Process written by Howard W. Pickering and published by . This book was released on 1989 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mechanistic model has been developed which for the first time considers the effect of hydrogen entry into a metal on the kinetics of the hydrogen evolution reaction (h.e.r.). The model enables computation of: 1) the hydrogen surface coverage and surface concentration; 2) the hydrogen adsorption, absorption, discharge and recombination rate constants; and 3) the h.e.r. coverage-dependent transfer coefficient, alpha and the exchange current density io, from a knowledge of the steady state hydrogen permeation current, cathodic charging current, hydrogen overvoltage and hydrogen diffusivity. The model predicts a linear relationship between permeation flux and square-root of the hydrogen recombination flux and provides an analytical method to determine the cathodic potential range for operation of a coupled discharge-recombination mechanism of the h.e.r. With modifications the model can treat permeation data for which 1) the mechanics of the discharge step involve a (proposed) selvedge reaction; and 2) surface hydrogen coverages are relatively high as in the presence of poisons (e.g., H2S or As2O3). Some of the existing literature data for hydrogen permeation in iron and nickel in acid and alkaline solutions are successfully analyzed. Keywords: Electrochemistry; Hydrogen permeation model; Surface coverage; H.E.R. rate constants; Selvedge reaction; Exchange current; Hydrogen overvoltage; Hydrogen absorption and adsorption rate constants. (edc).
Download or read book Electrochemistry of Insertion Materials for Hydrogen and Lithium written by Su-Il Pyun and published by Springer Science & Business Media. This book was released on 2012-08-22 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The understanding of hydrogen/lithium insertion phenomena is of great importance for the development of the next generation of functional electrochemical devices such as rechargeable batteries, electrochromic devices, and fuel cells. This volume introduces a variety of viable electrochemical methods to identify reaction mechanisms and evaluate relevant kinetic properties of insertion electrodes. The authors also outline various ways to analyze anomalous behaviour of hydrogen/lithium transport through insertion electrodes.
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1989-04 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Corrosion Engineering written by Branko N. Popov and published by Elsevier. This book was released on 2015-02-26 with total page 813 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion Engineering: Principles and Solved Problems covers corrosion engineering through an extensive theoretical description of the principles of corrosion theory, passivity and corrosion prevention strategies and design of corrosion protection systems. The book is updated with results published in papers and reviews in the last twenty years. Solved corrosion case studies, corrosion analysis and solved corrosion problems in the book are presented to help the reader to understand the corrosion fundamental principles from thermodynamics and electrochemical kinetics, the mechanism that triggers the corrosion processes at the metal interface and how to control or inhibit the corrosion rates. The book covers the multidisciplinary nature of corrosion engineering through topics from electrochemistry, thermodynamics, mechanical, bioengineering and civil engineering. - Addresses the corrosion theory, passivity, material selections and designs - Covers extensively the corrosion engineering protection strategies - Contains over 500 solved problems, diagrams, case studies and end of chapter problems - Could be used as a text in advanced/graduate corrosion courses as well self-study reference for corrosion engineers
Download or read book Handbook of Environmental Degradation of Materials written by Myer Kutz and published by William Andrew. This book was released on 2018-06-15 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Environmental Degradation of Materials, Third Edition, explains how to measure, analyze and control environmental degradation for a wide range of industrial materials, including metals, polymers, ceramics, concrete, wood and textiles exposed to environmental factors, such as weather, seawater, and fire. This updated edition divides the material into four new sections, Analysis and Testing, Types of Degradation, Protective Measures and Surface Engineering, then concluding with Case Studies. New chapters include topics on Hydrogen Permeation and Hydrogen Induced Cracking, Weathering of Plastics, the Environmental Degradation of Ceramics and Advanced Materials, Antimicrobial Layers, Coatings, and the Corrosion of Pipes in Drinking Water Systems. Expert contributors to this book provide a wealth of insider knowledge and engineering expertise that complements their explanations and advice. Case Studies from areas such as pipelines, tankers, packaging and chemical processing equipment ensure that the reader understands the practical measures that can be put in place to save money, lives and the environment. - Introduces the reader to the effects of environmental degradation on a wide range of materials, including metals, plastics, concrete, wood and textiles - Describes the kind of degradation that effects each material and how best to protect it - Includes case studies that show how organizations, from small consulting firms, to corporate giants design and manufacture products that are more resistant to environmental effects
Download or read book Electrochemical Aspects of Hydrogen in Metals written by John J. DeLuccia and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a review of the electrode kinetics of the hydrogen evolution reaction and the entry of electrolytic hydrogen into metals as it affects hydrogen embrittlement. Basic electrochemical parameters (for example, exchange current density, activation and concentration polarization, and coverage) are described for the determination of a rate and mechanism for the hydrogen evolution reaction. Hydrogen coverage dependence on overpotential and current is discussed with reference to the Langmuir adsorption isotherm. Reactions responsible for the electrolytic production of hydrogen in aqueous solutions are described for corrosion processes that occur in occluded regions on or below the surface of the metal. Hydrogen adsorption-absorption processes and electrochemical hydrogen permeation test techniques for the determination of the susceptibility of metals to internal hydrogen embrittlement are presented.
Download or read book Mathematical Modelling of Weld Phenomena 4 written by H. Cerjak and published by CRC Press. This book was released on 1998 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains the papers presented at the fourth International Seminar "Numerical Analysis of Weldability" held in September 1997 at Schloss Seggau near Graz, Austria.
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990-03 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogen Entry and Action in Metals written by Malcolm Allan Fullenwider and published by Pergamon. This book was released on 1983 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Corrosion in Marine and Saltwater Environments II written by D. A. Shifler and published by The Electrochemical Society. This book was released on 2005 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogen Movement in Steel written by Ellis E. Fletcher and published by . This book was released on 1965 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses the ways in which H2 enters steels, how it moves through steel, and methods whereby it may be removed from steel. The solubility of H2 is important in understanding other aspects of the behavior of H2 in steel and such aspects of solubility as preferred lattice sites, lattice expansion, measurements of solubility, and estimates of equilibrium H2 pressure in steel are discussed. The permeation of H2 through steel consisting of interactions at both the entry and exit surfaces of the metal as well as diffusion through the bulk metal is discussed. The various possibilities of H2 entry by corrosion processes, electrochemical processes, and other means are considered as well as factors which influence the rate of H2 removal from iron and steel. (Author).
Download or read book Hydrogen Embrittlement written by Louis Raymond and published by ASTM International. This book was released on 1988 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogen in Metals written by and published by . This book was released on 1980 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prediction of Hydrogen Entry and Permeation in Metals and Alloys written by and published by . This book was released on 1995 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes results of the past year on our continuing experiments directed to the problem of hydrogen entry and degradation of materials both of planar surfaces and for the more complicated recessed surface. For the planar surface the hydrogen permeation and scanning tunneling microscopy (STM) techniques were used, and for the recessed surface the study used the hydrogen permeation technique and a microscopy/electrochemical probe technique. Microstructural effects and the role of microbes are also under study. In aqueous solutions both IR drop and acidification within recesses in iron surfaces were found to enhance proton reduction and hydrogen absorption. In addition, it was found that flat, smooth surfaces can form or develop recesses as a result of corrosion or other reasons, e.g., grain boundary grooves that form during corrosion of Cr-depleted alloy in sensitized stainless steel. These recesses were found to be just as prone to proton discharge and hydrogen absorption as pre-existing recesses. Distributions of anodic and cathodic reaction sites were analyzed within a propagating crack under cathodic protection conditions using an IR based model. Results are presented of STM studies of hydrogen adsorption from the gas phase on silicon. jg.
Download or read book Morphology of Electrochemically and Chemically Deposited Metals written by Konstantin I. Popov and published by Springer. This book was released on 2016-03-24 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the newest achievements in the area of electrochemically and chemically deposited metals and alloys. In particular, the book is devoted to the surface morphology of deposited metals and alloys. It contains an in-depth analysis of the influence of the parameters of electrodeposition or chemical deposition of metals and alloys, which will likely lead to technological advances in industrial settings world-wide. Professionals in electrometallurgical and electroplating plants will find the book indispensable. This book will also be useful in the automotive, aerospace, electronics, energy device and biomedical industries. In academia, researchers in electrodeposition at both undergraduate and graduate levels will find this book a very valuable resource for their courses and projects.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
