Effect of stress on passivation kinetics and passivation modelling of 304L stainless steel in acidic medium
Communication sans acte
Date
2015Abstract
Stress Corrosion Cracking (SCC) is a typical failure of engineering materials applied in corrosive environments. In light water reactors for example, this results in loss of electrical capacity and related costs of repair and replacement. Film Rupture-dissolution Model explains interganular SCC as a phenomenon resulting from repetitive activation/passivation cycles (Fig.1). Activation takes place mechanically by slip-induced film breakdown which causes excessive material dissolution until it repassivates again. In this study, potentiodynamic cycling experiments serve effectively to perform in-Lab electrochemical simulation of this process. Conventional electrochemical techniques and Inductively Coupled Plasma – Optical Emission Spectroscopy are used to in-situ measure the corrosion transients and dissolution rates. A model was developed proving that stainless steel repassivates according to the High Field Ion Conduction Model in acidic solutions. Having this, quantification of the instantaneous passive film thickness and corrosion susceptibility of the passive film constructed over the surface has been successfully achieved (Fig.2). Quantified results showed that for stressed materials, the time to repassivation is longer, and the constructed passive film, though thicker, is more susceptible to corrosion than passive films developed over non-stressed materials.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Communication avec acteMUBARAK, Hazem; JEGOU, Sébastien; BARRALLIER, Laurent; VOLOVITCH, Polina; OGLE, Kévin (2015)In this study, Stress Corrosion Cracking (SCC) produced for 304L austenitic stainless steel in different concentrations of chloride containing sulfuric acid solutions was analyzed using both Scanning Electron Microscope ...
-
Communication sans acteFABRE, Agnès; JEGOU, Sébastien; BARRALLIER, Laurent (2014)Le rodage est un phénomène présent lors des premiers cycles de frottement qui modifie la surface de contact d’une pièce d’un point de vue géométrique, couplé à des modifications de propriétés mécaniques. Le rodage génère ...
-
Communication sans acteJEGOU, Sébastien; BARRALLIER, Laurent; FABRE, Agnès (2014)In a previous study, the capability of X-ray diffraction technique to qualify damage occurring during friction had been proven [1]. The purpose of this study is to complete this research in order to develop a method to ...
-
Article dans une revue avec comité de lectureWEIL, Hadrien; BARRALLIER, Laurent; JEGOU, Sébastien; COURLEUX, Alice; BECK, Guillaume (Materials Research Forum LLC, 2016)The objective of this work is to propose a model abled to optimize the mechanical properties from gaseous nitriding of steels (hardness, residual stresses) for a given loading and fatigue lifetime. Multiaxial fatigue ...
-
Optimization of gaseous nitriding of carbon iron-based alloy based on fatigue resistance modelling Article dans une revue avec comité de lectureWEIL, Hadrien; BARRALLIER, Laurent; JEGOU, Sébastien; CALDEIRA-MEULNOTTE, Nancy; BECK, Guillaume (Elsevier, 2018)Gaseous nitriding of steels is a well-established thermochemical surface treat- ments that increases the fatigue resistance of treated parts. The present work proposes a modelling of the fatigue life as a function of the ...