Fourth CorroZoom Season 3 Webinar - Chaofang Dong

27 March 2023 at 0800 US Eastern

To register (free for all): 

https://osu.zoom.us/webinar/register/WN_lead_HwPTJ-iVT5ooTrfSw

 

 

Integrated Multiscale Modeling and Prediction of Corrosion

 

Chaofang Dong

University of Science and Technology Beijing, China

 

Abstract

In the last decade, corrosion modeling has made progress towards the atomic-scale clarification of corrosion mechanisms and the computer-aided designing of advanced materials with good corrosion resistance. This talk focuses on the theoretical methods of integrated calculations and the developments in applications to the study of corrosion. Three specific applications will be presented: first-principles techniques combined with molecular dynamics, peridynamic theory, and the finite element method provide multiscale models to investigate the micro-mechanisms of stress corrosion cracking and hydrogen-induced cracking. The modeling of passivity and passive film breakdown will be discussed elaborately through the transport of point defects and its correlation with the energy level degeneracy. Because corrosion jeopardizes materials longevity and engineering safety, the corrosion rate needs to be predicted to better guide materials selection. Although field exposure experiments are dependable, their prohibitive cost and time-consuming nature make it difficult to obtain a large dataset for machine learning. Here, we propose a strategy called Integrating Ab-initio Calculations with Random Forest to optimize the model, thereby estimating the corrosion rate of Al alloys in diverse environments. For better and efficient development of integrated computation of corrosion, extensive cooperation and powerful data infrastructure are needed by stronger joint efforts in the future.

 

Biography

Chaofang Dong is professor in the National Materials Corrosion and Protection Data Center and Beijing Advanced Innovation Center for Materials Genome Engineering at the University of Science and Technology Beijing (USTB). She has been in Corrosion and Protection Center of USTB for 29 years since her undergraduate studies. She spent one year at UC Berkeley in the US. Her research interests are focused on the study of passivation, pitting and atmospheric corrosion, including multiscale simulation, computation, and micro-mechanism analysis of corrosion. She has been involved in the development of a data-driven rational design strategy, and engineering a robust pathway from simulation analysis, experimental validation to engineering demonstration for the development of corrosion-resistant metals.

 

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Fifth CorroZoom Season 3 Webinar - Kevin Ogle

26 April 2023 at 0800 US Eastern

To register (free for all): 

https://osu.zoom.us/webinar/register/WN_UdDaQi7MS9q29jUp1YHF-Q

 

 

Element-resolved electrochemistry and its application to aqueous corrosion

 

Kevin Ogle

Ecole Nationale Supérieure de Chimie de Paris, PSL University in Paris, France

 

Abstract

Aqueous metallic corrosion is an electrochemical phenomenon and much of the theory and experimental techniques for predicting and assessing corrosion are based on the application of electrochemical concepts and techniques. While electrochemical measurements provide rich and meaningful kinetic information on the underlying faradaic processes, they are often insufficient to identify the chemical mechanisms of these processes, limiting their utility as predictive tools. Element-resolved electrochemistry, specifically atomic emission spectroelectrochemistry (AESEC), is an emerging technique that provides elemental resolution to conventional electrochemical methods. In this way we can quantitatively probe the “fate” of the elemental constituents of a material in real time during its reaction with an aggressive electrolyte. The kinetics of selective dissolution, surface enrichment, and non-faradaic processes such as oxide dissolution or particle detachment - not apparent in conventional electrochemical methods - may be directly measured with quantitative time resolution difficult to achieve by ex situ analysis. In this presentation we will review the methodology of AESEC and its application to a variety of aqueous corrosion phenomena including the passivation of multi-principal element alloys, anomalous hydrogen production on magnesium, and the pickling of aluminum alloys.

 

Biography

Kevin Ogle is a professor at the Ecole Nationale Supérieure de Chimie de Paris, PSL University in Paris, France and a research affiliation with the Institut de Recherche de Chimie-Paris, CNRS. He earned the PhD in Chemistry from the University of Texas at Austin, his dissertation work on the kinetics of heterogenous catalysis by single crystal surfaces using operando surface analytical techniques. After several years at Lawrence Berkeley Laboratory and a brief period as professor at a liberal arts college, he entered the R&D of the European steel industry (today ArcelorMittal) in the area of corrosion and surface treatment. There he pursued fundamental research on the use of local electrochemical techniques and the development of atomic emission spectroelectrochemistry (AESEC). He joined the faculty of the ENSCP in 2005 and continues research with element resolved electrochemistry in several areas of aqueous corrosion and surface treatment processes.

 

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CorroZoom Updates

Season 2 of CorroZoom has ended as of the last webinar on 31 May 2022. You can view the list of speakers from season 1 and season 2 in the tab marked “Previous Webinars.” You will also find links to recordings of some of the previous webinars.

The list of speakers of CorroZoom Season 3 will be announced here when it is available and by email to people for whom we have email addresses. If you are not on the CorroZoom email distribution list but want to be added, please send an email to guo.237@osu.edu.

Thanks to everyone for making season 1 and season 2 of CorroZoom a huge success!