Download or read book MECANISME DE CORROSION DE L ACIER INOXYDABLE Z3 CN 18 10 EN PRESENCE DE CONDENSATS NITRIQUES written by FANNY.. BALBAUD and published by . This book was released on 1998 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS LES INSTALLATIONS EN ACIER INOXYDABLE Z3 CN 18.10 METTANT EN OEUVRE DE L'ACIDE NITRIQUE A L'EBULLITION, UNE CORROSION INTERGRANULAIRE IMPORTANTE PEUT SURVENIR DANS LES ZONES DE CONDENSATION INDEPENDAMMENT DE TOUT PHENOMENE DE SENSIBILISATION DE L'ACIER. DES ESSAIS DE CORROSION EN REACTEURS ET DANS UN MONTAGE SPECIFIQUE D'ETUDE, CIRCE, ONT PERMIS DE PRECISER LES CONDITIONS D'APPARITION DE CETTE CORROSION ET ONT MIS EN EVIDENCE UNE SIMILITUDE AVEC LA CORROSION OBSERVEE EN MILIEU ETENDU NON RENOUVELE : LES PARAMETRES SPECIFIQUES DES CONDENSATS SONT LE RAPPORT SURFACE METALLIQUE SUR VOLUME EXTREMEMENT ELEVE ET LE FAIBLE DEBIT DE RENOUVELLEMENT QUI PROVOQUENT UNE CONCENTRATION EN PRODUITS D'OXYDATION DE L'ACIER ET EN PRODUITS DE REDUCTION DE L'ACIDE NITRIQUE. L'AMORCAGE DE LA CORROSION INTERGRANULAIRE EST ATTRIBUE A L'AUGMENTATION DE LA VITESSE DE REDUCTION DE L'ACIDE NITRIQUE PAR UN PROCESSUS AUTOCATALYTIQUE QUI A PU ETRE DEMONTRE PAR DES MESURES ELECTROCHIMIQUES SUR PLATINE ET SUR ACIER. LE MECANISME DE REDUCTION MET EN JEU UNE ETAPE DE TRANSFERT DE CHARGE OU L'ACIDE NITREUX EST L'ESPECE ELECTROACTIVE QUI SE REDUIT EN MONOXYDE D'AZOTE, PUIS UNE REACTION CHIMIQUE DE REGENERATION DE L'ACIDE NITREUX. L'ETUDE THERMODYNAMIQUE A CONDUIT A UNE REPRESENTATION DU TYPE DIAGRAMME DE POURBAIX DES PROPRIETES CHIMIQUES ET ELECTROCHIMIQUES DU MILIEU NITRIQUE ET A PERMIS DE DETERMINER L'ENTHALPIE LIBRE DE FORMATION DE L'ACIDE NITREUX EN SOLUTION A 100C. CETTE REPRESENTATION, EN COORDONNEES LOG(P#O#2)/LOG(P#H#N#O#3) OU E#E#X#P#E#R#I#M#E#N#T#A#L/LOG(P#H#N#O#3), MET EN EVIDENCE DEUX DOMAINES DE CONCENTRATION CONCERNANT LE PRODUIT STABLE FORME PAR REDUCTION DE L'ACIDE NITRIQUE : A 100C, LE PRODUIT DE REDUCTION EST NO POUR LES CONCENTRATIONS INFERIEURES A 8 MOL.L##1 ET NO#2 POUR LES CONCENTRATIONS SUPERIEURES. L'ENSEMBLE DE CES RESULTATS A PERMIS D'ABOUTIR A UNE HYPOTHESE DE MECANISME DE CORROSION DE L'ACIER INOXYDABLE Z3 CN 18.10 EN PRESENCE DE CONDENSATS NITRIQUES.

Download or read book Materials and Processes for Nuclear Energy Today and in the Future written by Fanny Balbaud-Célérier and published by John Wiley & Sons. This book was released on 2024-11-20 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a low carbon energy source, nuclear energy plays a reinforced role in a sustainable electricity mix. However, strengthening the share of nuclear energy implies the guarantee of safe, long-term operation of current systems and potentially the fostering of new constructions. Service life extension – as well as the design of future nuclear power plants – relies on the availability of robust and qualified structural materials, and their manufacturing processes. The science and engineering of materials are key in selecting robust material solutions and predicting aging mechanisms. Materials and Processes for Nuclear Energy Today and in the Future reviews different reactor concepts and fuel management systems. Nuclear equipment has to maintain integrity under extreme conditions, such as high temperature, radiation, loads and/or corrosive environments. This book analyzes the requirements on components, and introduces reference solutions regarding materials and processes. It describes the materials’ main properties, their limits and the current R&D trends. Lastly, innovations are discussed, such as materials with enhanced properties, advanced manufacturing or using AI.

Download or read book Contribution la connaissance du comportement de l acier Z3 CN 18 10 dans l acide nitrique concentr chaud et confin written by Jean-Pierre Schosger and published by . This book was released on 1996 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: EN MILIEU NITRIQUE CONCENTRE, CHAUD ET NON RENOUVELE, LA CORROSION DES ACIERS INOXYDABLES SUBIT UNE ACCELERATION. CE PHENOMENE CONNU SEMBLE DEPENDRE DE LA PHASE GAZEUSE ET DE L'ACCUMULATION DES PRODUITS DE CORROSION EN SOLUTION. DEUX TYPES DE PRODUITS DE CORROSION DOIVENT ETRE DISTINGUES : D'UNE PART, LES CATIONS FERRIQUES, CHROMIQUES ET NICKELEUX PROVENANT DE L'OXYDATION DU MATERIAU, D'AUTRE PART, L'ACIDE NITREUX ET LES OXYDES D'AZOTE GAZEUX PROVENANT DE LA REDUCTION DE L'ACIDE NITRIQUE. EXPERIMENTALEMENT, LE VIEILLISSEMENT DE LA SOLUTION A ETE SIMULE PAR AJOUT DE CES DIVERS PRODUITS DE CORROSION. LE PHENOMENE A ETE CARACTERISE A LONG TERME EN MILIEU CONFINE ET LES INFLUENCES DES PRODUITS DE CORROSION ONT ETE ETUDIEES. INITIALEMENT, LA VITESSE DE LA CORROSION UNIFORME DE L'ECHANTILLON PASSIF EST FAIBLE. APRES UNE DUREE D'IMMERSION VARIABLE, UNE TRANSITION A LIEU ET LA VITESSE DE CORROSION AUGMENTE RAPIDEMENT. APRES LA TRANSITION, LA VITESSE DE CORROSION AUGMENTE PLUS DOUCEMENT ET UNE COMPOSANTE INTERGRANULAIRE APPARAIT. CETTE TRANSITION RESULTE DE L'ACTION CATALYTIQUE DES PRODUITS DE REDUCTION QUI ACCELERENT LA VITESSE DE REDUCTION DU MILIEU NITRIQUE. LES CATIONS METALLIQUES DE FER ET DE CHROME ONT AUSSI UNE ACTION CATALYTIQUE MAIS MOINS EFFICACE. L'APPARITION DE L'AUTOCATALYSE DUE AUX PRODUITS DE REDUCTION DU MILIEU NITRIQUE EST RETARDEE PAR LA PRESENCE D'OXYGENE EN PHASE GAZEUSE ET SEMBLE ETRE INFLUENCEE PAR LES RAPPORTS SURFACE DE L'ECHANTILLON SUR VOLUME DE LA SOLUTION ET VOLUME DE LA PHASE GAZEUSE SUR VOLUME DE LA SOLUTION.

Download or read book Evolutions morphologique cin tique et thermique inattendues dans la corrosion d alliages par les gaz written by Jean-Claude Cannot and published by . This book was released on 1986 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion de l'acier inoxydable Z2CN 18-10 par un mélange gazeux iode-eau-air en présence ou non de vapeurs nitriques. Mise en évidence de deux étapes successives : initiation (réaction solide-gaz) et propagation (réaction solide-liquide). Oxydation du titane et des alliages Ti-Zr par l'oxygène. Mise en évidence de deux comportements : 1) stratification mécanique des couches de corrosion; 2) stratification mécano-chimique.

Download or read book CORROSION ELECTROCHIMIQUE DU FER ET DE L ACIER INOXYDABLE Z 2 CN 18 10 DANS LE MILIEU NA written by MOHAMMED.. AZZI and published by . This book was released on 1984 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: EN UTILISANT UNE ELECTRODE DE REFERENCE DU TYPE PT/C0::(2) (0,7 ATM)O::(2) (0,3 ATM)/CO::(3)**(2-)ALUMINE BETA /, LE DOMAINE EXPERIMENTAL DE STABILITE ELECTROCHIMIQUE DU MILIEU NA::(2)CO::(3-)K::(2)CO::(3) FONDU A 800**(O)C A ETE DETERMINE PAR VOLTAMPEROMETRIE SUR ELECTRODE D'ARGENT (2.00 V), D'OR (1,85 V) ET DE PLATINE (2,30 V); CE N'EST QUE SUR LE PLATINE QUE L'ON ATTEINT UNE VALEUR PROCHE DE LA VALEUR THERMODYNAMIQUE (2,26 V). SI L'ATMOSPHERE AU-DESSUS DU MILIEU FONDU RENFERME DE L'OXYGENE OU DE LA VAPEUR D'EAU, CES ESPECES SE DISSOLVENT DANS LA SOLUTION RESPECTIVEMENT SOUS FORME D'IONS O::(2)**(2-) ET O::(2)**(-), ET DE MOLECULES H::(2)O OU D'IONS OH**(-). DANS LA SOLUTION NA::(2)CO::(3)-K::(2)CO::(3) FONDU A 800**(O)C, LE FER EST CORROLE AVEC FORMATION D'IONS FE**(2+) LORSQUE L'ATMOSPHERE GAZEUSE EST CO::(2) PUR, OU CO::(2) PUR, OU CO::(2)+O::(2) OU CO::(2)+H::(2)O: DANS LES DEUX PREMIERS CAS IL SE FORME EGALEMENT UNE COUCHE D'OXYDES FEO ET FE::(3)O::(4) OU FE::(2)O::(3) NON PROTECTRICE. L'ACIER INOXYDABLE Z2 CN 18-10 EST PASSIVE PAR FORMATION D'UNE COUCHE DE (NA-K)CRO::(2) LORSQUE L'ATMOSPHERE EST CO::(2) PUR, ET SUBIT UNE CORROSION INTERGRANULAIRE LORSQUE L'ATMOSPHERE EST CO::(2)+H::(2)O

Download or read book Influence de la pr sence de microfissures sur la susceptibilit la corrosion sous contrainte d un acier inoxydable Z6 CN 18 10 l tat grenaille written by Charles MUNOZ and published by . This book was released on 1992 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Corrosion Science and Engineering written by Damien Feron and published by Elsevier. This book was released on 2012-02-21 with total page 1073 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion of nuclear materials, i.e. the interaction between these materials and their environments, is a major issue for plant safety as well as for operation and economic competitiveness. Understanding these corrosion mechanisms, the systems and materials they affect, and the methods to accurately measure their incidence is of critical importance to the nuclear industry. Combining assessment techniques and analytical models into this understanding allows operators to predict the service life of corrosion-affected nuclear plant materials, and to apply the most appropriate maintenance and mitigation options to ensure safe long term operation.This book critically reviews the fundamental corrosion mechanisms that affect nuclear power plants and facilities. Initial sections introduce the complex field of nuclear corrosion science, with detailed chapters on the different types of both aqueous and non aqueous corrosion mechanisms and the nuclear materials susceptible to attack from them. This is complemented by reviews of monitoring and control methodologies, as well as modelling and lifetime prediction approaches. Given that corrosion is an applied science, the final sections review corrosion issues across the range of current and next-generation nuclear reactors, and across such nuclear applications as fuel reprocessing facilities, radioactive waste storage and geological disposal systems.With its distinguished editor and international team of expert contributors, Nuclear corrosion science and engineering is an invaluable reference for nuclear metallurgists, materials scientists and engineers, as well as nuclear facility operators, regulators and consultants, and researchers and academics in this field. - Comprehensively reviews the fundamental corrosion mechanisms that affect nuclear power plants and facilities - Chapters assess different types of both aqueous and non aqueous corrosion mechanisms and the nuclear materials susceptible to attack from them - Considers monitoring and control methodologies, as well as modelling and lifetime prediction approaches

Download or read book Fundamentals of Electrochemical Corrosion written by Ele Eugene Stansbury and published by ASM International. This book was released on 2000-01-01 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the essential aspects of the corrosion behavior of metals in aqueous environments, this book is designed with the flexibility needed for use in courses for upper-level undergraduate and graduate students, for concentrated courses in industry, for individual study, and as a reference book.

Download or read book The Nuclear Fuel Cycle written by P. D. Wilson and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Treatment Handbook written by and published by . This book was released on 2007 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: