Preliminary Corrosion Studies of Candidate Materials for Supercritical Water Oxidation Reactor Systems

Preliminary Corrosion Studies of Candidate Materials for Supercritical Water Oxidation Reactor Systems
Author: John Clarke Orzalli
Publisher:
Total Pages: 316
Release: 1994
Genre: Corrosive wastes
ISBN:

An experimental test facility has been designed and constructed for investigation of the corrosion behavior of candidate materials in a supercritical water oxidation environment. The high temperatures (500 deg C) and high pressures (300 atm) required in this process, made the experimental apparatus construction and control a complex engineering problem. The facility consists of two systems. The first is an exposure autoclave internal volume 850 ml, with associated monitoring and control systems for conducting long term exposure testing of test coupons and U-bends. The second is an electrochemical cell with a potentiostat and frequency response analyzer for conducting Electronic Impedance Spectroscopy (EIS) in the supercritical water environment. Exposure testing of three candidate materials; Inconel 625, Hastelloy C-276 and 316 stainless steel was conducted at three temperature regimes corresponding to three locations in a SCWO waste treatment system. Preliminary results are presented in an environment of demineralized water as a control. Experimental results indicate evidence of a film on the materials characterized by slight weight gain. Light and confocal laser light microscopic evaluations revealed the presence of localized pitting corrosion on the Inconel 625.

Corrosion Characteristics, Mechanisms and Control Methods of Candidate Alloys in Sub- and Supercritical Water

Corrosion Characteristics, Mechanisms and Control Methods of Candidate Alloys in Sub- and Supercritical Water
Author: Donghai Xu
Publisher: Springer Nature
Total Pages: 248
Release: 2021-12-07
Genre: Science
ISBN: 9811655251

This book aims to provide comprehensive and systematic introduction and summary of corrosion characteristics, mechanisms, and control methods of candidate alloys in sub- and supercritical water environment. First of all, corrosion types of candidate alloys and the effects of major alloying elements on corrosion resistance of potential alloys in sub- and supercritical water are compared and analyzed. At the same time, research status of candidate materials, and development and application trends of several corrosion-resistant alloys are summarized. Then, corrosion characteristics of Ni-Cr, Ni-Cr-Mo, Ni-Fe-Cr and Ni-Fe-Cr-Mo-Cu corrosion-resistant alloys, FeCrAl alloy, and Zircaloy are discussed in detail, including the corrosion rate, the structure and composition of oxide film, and the effects of various surface treatment processes, etc. More specifically, it also investigates corrosion behavior of Ni-based alloy, Fe-Ni-based, and stainless steels in supercritical water. The effects of aggressive species on the corrosion behavior of Ni-base alloys are also explored in supercritical water. Readers will further discover the total corrosion processes and mechanisms of typical candidate alloys in sub- and supercritical water environment. Finally, the work explores the corrosion control methods such as ceramic coatings and passivation processes in supercritical water oxidation and in subcritical water, respectively. Future challenges and development trends of corrosion research of candidate materials in sub- and supercritical water environments are covered at the end of this book. It offers valuable reference for theoretically guiding material selection and design and operating parameter optimization of key equipment in the sub- and supercritical water technologies. The book is written for senior undergraduates, graduate students, scholars, and researchers who are interested in corrosion behavior of candidate materials of supercritical water oxidation system, supercritical water gasification system, and nuclear reactor.

Masters Theses in the Pure and Applied Sciences

Masters Theses in the Pure and Applied Sciences
Author: Wade H. Shafer
Publisher: Springer Science & Business Media
Total Pages: 427
Release: 2012-12-06
Genre: Science
ISBN: 1461303931

Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 39 (thesis year 1994) a total of 13,953 thesis titles from 21 Canadian and 159 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 39 reports theses submitted in 1994, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.

An Investigation of Corrosion Mechanisms of Constructional Alloys in Supercritical Water Oxidation (SCWO) Systems

An Investigation of Corrosion Mechanisms of Constructional Alloys in Supercritical Water Oxidation (SCWO) Systems
Author: Hojong Kim
Publisher:
Total Pages: 186
Release: 2004
Genre:
ISBN:

(Cont.) The suppression of dealloying at supercritical temperatures comes from the low proton concentration associated with the low dissociation constant of HCl and water. However, the growth rate of the dealloyed oxide layer at subcritical temperatures is very fast, which is primarily due to the dealloying and the high diffusivity of the nickel in this defective oxide layer. SCC at subcritical temperatures results from the dealloyed oxide layer formation along the grain boundary as intrusions, which act as a precursor to the crack initiation and propagation. SCC at the supercritical temperature is thought to result from the direct chemical attack of associated HC1 molecules. SCC is not observed in the neutral solution.

Chemistry and Electrochemistry of Corrosion and Stress Corrosion Cracking

Chemistry and Electrochemistry of Corrosion and Stress Corrosion Cracking
Author: Russell H. Jones
Publisher: Society for Mining Metallurgy & Exploration
Total Pages: 792
Release: 2001
Genre: Science
ISBN:

This collection of papers from the 2001 TMS Annual Meeting held in New Orleans includes papers from the symposium on the chemistry and electrochemistry of corrosion and stress corrosion cracking. It covers topics such as chemistry differences between crack initiation and propagation.