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AbstractAbstract
[en] This research thesis reports the study of the nature and stability of passive films formed on stainless steels in chloride solutions in order to predict the conditions under which some forms of localized corrosion may occur. It aims at understanding the influence of surface preparation, of temperature, of strain rate, and, above all, of alloying elements on the reconstruction kinetics of the passive film after a disturbance induced by a mechanical action. After a discussion of the various techniques used to study passive films, and of their results, the author presents the experimental method (potentiostatic test and mechanical de-passivation test) and the obtained results which are then interpreted, more particularly in terms of influence of alloying elements (nickel, molybdenum, copper, titanium, austeno-ferritic steel). Correlations are established between the dynamic behaviour of passive films formed on the studied steels, and their sensitivity to stress corrosion cracking
[fr]
L'etude du comportement dynamique des couches passives formees sur les aciers inoxydables en milieux chlorures, a l'aide des essais de de-passivation mecanique, a permis d'interpreter l'influence des elements d'alliage, de la temperature et de la vitesse de deformation sur les phenomenes de de-passivation-repassivation. Par ailleurs, des correlations entre le comportement du film passif et la resistance a la corrosion sous contrainte sont proposees. Dans le premier chapitre sont presentes les differentes techniques utilisees pour l'etude des films passifs ainsi que les resultats obtenus a ce sujet. Les chapitres 2 et 3 sont consacres a la description de la methode experimentale et aux resultats experimentaux obtenus. Le dernier chapitre est reserve aux interpretations des resultats et particulierement a l'influence de certains elements d'alliage. Par ailleurs, on a pu etablir des correlations entre le comportement dynamique des films passifs formes sur les aciers etudies et leur sensibilite a la C.S.C.Original Title
Etude dynamique des couches passives formees sur les aciers inoxydables en milieu chlorure. Correlation avec le comportement en corrosion sous contrainte - Influence de quelques elements d'alliage
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Source
2 Jul 1985; 77 p; 60 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS-NKM website for current contact and E-mail addresses: http://www.iaea.org/inis/contacts/; These Docteur en genie mecanique
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Report
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Thesis/Dissertation
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